{"format":"barcodepedia.product.v2","key":"05000159551724","url":"/product/5000159551724/mars-duo-78-8-g","version":{"number":2,"recorded_at":"2026-09-25T19:31:01.234Z","author_type":"user_bot","bot_pass":null,"change_note":"Open Food Facts photos requested with the result"},"product":{"schemaVersion":2,"identity":{"gtin":"05000159551724","name":"Mars Duo 78.8 g","brand":"brand/mars","family":"family/mars-bar","summary":"The British and Irish two-bar Mars Duo, 2 x 39.4 g of caramel and nougat in milk chocolate, made in the United Kingdom by Mars Wrigley Confectionery UK.","category":"category/10000045","last_seen":"2026-09-25","net_content":{"unit":"g","value":78.8},"pack_format":"two-bar wrapper","piece_count":2,"last_seen_note":"In stock at GBP 2.15 at The Grocery Store, Wembley, London, on Devo.","country_of_sale":["GB","IE"],"country_of_origin":["GB"],"default_observation":"label-2025"},"selectedId":"__legacy","observations":[{"id":"label-2025","label":"GB and IE wrapper, photos 2025","kind":"label","market":["GB","IE"],"language":"en","validFrom":null,"validUntil":null,"observed":"2025-10-30","status":"supported","source":"^off-label","note":"Read from the Open Food Facts ingredients (imgid 9), nutrition (imgid 7) and front (imgid 8) photos uploaded 2025-10-30; the back photographed on 2025-09-13 (imgid 4) prints the same statement above the GB and IE consumer blocks, and the nutrition table photographed on 2025-03-27 (imgid 3) prints the same figures.","legacy":false,"ingredientsText":"Milk chocolate (40%) with soft nougat (32%) and caramel centre (27%). 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B01ET7KD1K answers 404 there, and the only Duo listing, B0074FP87E, is a box of 32 bars at EUR 62.99 from London Food Hall Ireland, printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"Searched amazon.co.uk on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (the barcode search returned no results). Besides the unavailable single B01ET7KD1K, the Duo listings are boxes of 32 (B0074FP87E at GBP 31.99 from Kidzkandy) and B00WUEQ69I \"Mars Chocolate Duo Chocolate Bar, 79 g\", unavailable and printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"The US import shop Brits R U.S. lists \"Mars Bar Duo\" with this barcode as its SKU, shown out of stock on 2026-09-25; no US storefront was searched, so US is not in country_of_sale.","domain":"markets","source":"https://britsrus.com/shop/mars-bar-duo/","observation":null}]}],"selected":{"id":"__legacy","label":"Evidence awaiting context review","kind":"legacy","market":[],"language":null,"validFrom":null,"validUntil":null,"observed":null,"status":"unconfirmed","source":null,"note":null,"legacy":true,"ingredientsText":null,"ingredientsDeclaration":null,"ingredientsExemptBasis":null,"ingredients":[],"panels":[],"specifications":[],"packaging":{},"credits":[],"images":[{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"front","note":null,"asset":"front-32f1036f.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:56.205Z","stored_width":1600,"stored_height":248,"original_width":3518,"matched_barcode":"5000159551724","original_height":545,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/front_en.26.full.jpg","provider_image_id":"front_en","provider_entity_id":"5000159551724"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"ingredients","note":null,"asset":"ingredients-1f5d9eda.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:57.060Z","stored_width":1600,"stored_height":209,"original_width":3789,"matched_barcode":"5000159551724","original_height":494,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/ingredients_en.28.full.jpg","provider_image_id":"ingredients_en","provider_entity_id":"5000159551724"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"nutrition","note":null,"asset":"nutrition-c0aabaec.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:59.168Z","stored_width":1600,"stored_height":1000,"original_width":2150,"matched_barcode":"5000159551724","original_height":1344,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/nutrition_en.24.full.jpg","provider_image_id":"nutrition_en","provider_entity_id":"5000159551724"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"back","note":null,"asset":"back-7a79f303.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:31:01.230Z","stored_width":1334,"stored_height":600,"original_width":1334,"matched_barcode":"5000159551724","original_height":600,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/packaging_en.22.full.jpg","provider_image_id":"packaging_en","provider_entity_id":"5000159551724"}],"allergens":[],"claims":[],"gaps":[{"state":"disputed","detail":"The typed Open Food Facts values for this barcode (722.7 kJ, 532 kcal, 6.3 g fat, 27 g carbohydrate, 24 g sugars, 1.8 g protein, 0.67 g salt per 100 g) mix the per-bar column with other figures and contradict the photographed table, so they are not used.","domain":"nutrition","source":"^off","observation":null},{"state":"unknown","detail":"Searched amazon.ie on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (with a Dublin delivery address): no single Duo pack was found; B01ET7KD1K answers 404 there, and the only Duo listing, B0074FP87E, is a box of 32 bars at EUR 62.99 from London Food Hall Ireland, printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"Searched amazon.co.uk on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (the barcode search returned no results). Besides the unavailable single B01ET7KD1K, the Duo listings are boxes of 32 (B0074FP87E at GBP 31.99 from Kidzkandy) and B00WUEQ69I \"Mars Chocolate Duo Chocolate Bar, 79 g\", unavailable and printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"The US import shop Brits R U.S. lists \"Mars Bar Duo\" with this barcode as its SKU, shown out of stock on 2026-09-25; no US storefront was searched, so US is not in country_of_sale.","domain":"markets","source":"https://britsrus.com/shop/mars-bar-duo/","observation":null}]},"references":[{"ref":"off","url":"https://world.openfoodfacts.org/product/5000159551724","kind":"catalogue","title":"Open Food Facts: Mars Duo (5000159551724)","licence":"ODbL","locator":null,"accessed":"2026-09-25","upstream":null,"published":null,"publisher":"Open Food Facts","record_id":"5000159551724","attribution":"Open Food Facts contributors"},{"ref":"off-label","url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/9.jpg","kind":"pack","title":"Ingredient statement, nutrition table and front of the Mars Duo wrapper","licence":"CC BY-SA 3.0","locator":"imgids 9 (ingredients), 7 (nutrition) and 8 (front), uploaded 2025-10-30","accessed":"2026-09-25","upstream":"off","published":"2025-10-30","publisher":"Open Food Facts","record_id":"5000159551724","attribution":"Open Food Facts contributors"},{"ref":"off-back","url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/4.jpg","kind":"pack","title":"Back of the Mars Duo wrapper with the GB and IE consumer blocks","licence":"CC BY-SA 3.0","locator":"imgid 4, 720 x 1280 px","accessed":"2026-09-25","upstream":"off","published":"2025-09-13","publisher":"Open Food Facts","record_id":"5000159551724","attribution":"Open Food Facts contributors"},{"ref":"erudus","url":"https://www.templemanrv.co.uk/nutrition-pdf/8097/","kind":"registry","title":"Erudus specification 11011: MARS Duo 32x2x39.4g GB IE Everest","licence":null,"locator":"inner component GTIN 5000159551724, outer case GTIN 5000159551717","accessed":"2026-09-25","upstream":null,"published":"2024-11-15","publisher":"Erudus (via Templeman)","record_id":"1f7afca444004f739624229ba7b307c4","attribution":null},{"ref":"devo","url":"https://devo.co.uk/shop/the-grocery-store-HA9/product/mars-duo-78g-5000159551724","kind":"retailer","title":"Mars Duo at The Grocery Store, Wembley, London","licence":null,"locator":"GBP 2.15, in stock","accessed":"2026-09-25","upstream":null,"published":null,"publisher":"Devo","record_id":"5000159551724","attribution":null},{"ref":"mrprice","url":"https://www.mrprice.online/products/mars-duo-chocolate-bar-2-x-39-4g","kind":"retailer","title":"Mars Duo Chocolate Bar 2 x 39.4g, MrPRICE.online","licence":null,"locator":"EUR 1.49, sold out online","accessed":"2026-09-25","upstream":null,"published":null,"publisher":"MrPRICE","record_id":"5000159551724","attribution":null},{"ref":"amazon-uk","url":"https://www.amazon.co.uk/dp/B01ET7KD1K","kind":"retailer","title":"Mars Duo 78.8g : Amazon.co.uk: Grocery","licence":null,"locator":"model number 105896211, currently unavailable","accessed":"2026-09-25","upstream":null,"published":null,"publisher":"Amazon.co.uk","record_id":"B01ET7KD1K","attribution":null},{"ref":"gs1-gdsn","url":"https://www.gs1.org/docs/gdsn/stats/gdsn_trading_partners.pdf","kind":"registry","title":"GDSN trading partners: GS1 GDSN member companies and their GLNs","licence":null,"locator":null,"accessed":"2026-09-25","upstream":null,"published":null,"publisher":"GS1","record_id":"5000159000000","attribution":null},{"ref":"wp-mars","url":"https://en.wikipedia.org/wiki/Mars_bar","kind":"publication","title":"Mars bar","licence":"CC BY-SA","locator":null,"accessed":"2026-09-25","upstream":null,"published":null,"publisher":"Wikipedia","record_id":null,"attribution":"Wikipedia contributors"}],"domains":{"book":{},"release":{},"game":{},"tracks":[],"contents":[]},"gaps":[{"state":"disputed","detail":"The typed Open Food Facts values for this barcode (722.7 kJ, 532 kcal, 6.3 g fat, 27 g carbohydrate, 24 g sugars, 1.8 g protein, 0.67 g salt per 100 g) mix the per-bar column with other figures and contradict the photographed table, so they are not used.","domain":"nutrition","source":"^off","observation":null},{"state":"unknown","detail":"Searched amazon.ie on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (with a Dublin delivery address): no single Duo pack was found; B01ET7KD1K answers 404 there, and the only Duo listing, B0074FP87E, is a box of 32 bars at EUR 62.99 from London Food Hall Ireland, printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"Searched amazon.co.uk on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (the barcode search returned no results). Besides the unavailable single B01ET7KD1K, the Duo listings are boxes of 32 (B0074FP87E at GBP 31.99 from Kidzkandy) and B00WUEQ69I \"Mars Chocolate Duo Chocolate Bar, 79 g\", unavailable and printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"The US import shop Brits R U.S. lists \"Mars Bar Duo\" with this barcode as its SKU, shown out of stock on 2026-09-25; no US storefront was searched, so US is not in country_of_sale.","domain":"markets","source":"https://britsrus.com/shop/mars-bar-duo/","observation":null}]},"quality":{"structureVersion":2,"needsRebuild":true,"reviewedOn":"2026-09-25","coverage":[{"domain":"Identity","recorded":3,"expected":3,"detail":"Name, brand and classification recorded"},{"domain":"Context","recorded":2,"expected":3,"detail":"Evidence groups assigned to a researched label, edition or analysis"},{"domain":"Label photographs","recorded":0,"expected":2,"detail":"Researched contexts with an assigned photograph"},{"domain":"GB and IE wrapper, photos 2025: nutrient evidence","recorded":20,"expected":20,"detail":"Recorded nutrient rows linked to a source; not the number of nutrients that ought to exist"},{"domain":"Manufacturer specification on Erudus (GB IE): nutrient evidence","recorded":8,"expected":8,"detail":"Recorded nutrient rows linked to a source; not the number of nutrients that ought to exist"}],"gaps":[{"domain":"nutrition","state":"disputed","detail":"The typed Open Food Facts values for this barcode (722.7 kJ, 532 kcal, 6.3 g fat, 27 g carbohydrate, 24 g sugars, 1.8 g protein, 0.67 g salt per 100 g) mix the per-bar column with other figures and contradict the photographed table, so they are not used."},{"domain":"markets","state":"unknown","detail":"Searched amazon.ie on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (with a Dublin delivery address): no single Duo pack was found; B01ET7KD1K answers 404 there, and the only Duo listing, B0074FP87E, is a box of 32 bars at EUR 62.99 from London Food Hall Ireland, printing no barcode."},{"domain":"markets","state":"unknown","detail":"Searched amazon.co.uk on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (the barcode search returned no results). Besides the unavailable single B01ET7KD1K, the Duo listings are boxes of 32 (B0074FP87E at GBP 31.99 from Kidzkandy) and B00WUEQ69I \"Mars Chocolate Duo Chocolate Bar, 79 g\", unavailable and printing no barcode."},{"domain":"markets","state":"unknown","detail":"The US import shop Brits R U.S. lists \"Mars Bar Duo\" with this barcode as its SKU, shown out of stock on 2026-09-25; no US storefront was searched, so US is not in country_of_sale."},{"domain":"evidence","state":"stale","detail":"Evidence was observed over a year ago; check for newer labels. Historical evidence remains valid.","observation":"erudus"},{"domain":"schema","state":"schema_gap","detail":"Review and assign legacy facts to coherent observations.","observation":"__legacy"},{"domain":"ingredients","state":"not_researched","detail":"Ingredient statement or sourced exemption not recorded.","observation":"__legacy"},{"domain":"nutrition","state":"not_researched","detail":"Nutrition declaration or exemption not recorded.","observation":"__legacy"}],"observations":[{"id":"label-2025","label":"GB and IE wrapper, photos 2025","supportedValues":20,"declaredValues":20,"sourceLinked":20,"stale":false},{"id":"erudus","label":"Manufacturer specification on Erudus (GB IE)","supportedValues":8,"declaredValues":8,"sourceLinked":8,"stale":true},{"id":"__legacy","label":"Evidence awaiting context review","supportedValues":0,"declaredValues":0,"sourceLinked":0,"stale":false}]},"images":[{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"front","note":null,"asset":"front-32f1036f.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:56.205Z","stored_width":1600,"stored_height":248,"original_width":3518,"matched_barcode":"5000159551724","original_height":545,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/front_en.26.full.jpg","provider_image_id":"front_en","provider_entity_id":"5000159551724","asset_url":"/uploads/images/product/05000159551724/front-32f1036f.jpg"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"ingredients","note":null,"asset":"ingredients-1f5d9eda.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:57.060Z","stored_width":1600,"stored_height":209,"original_width":3789,"matched_barcode":"5000159551724","original_height":494,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/ingredients_en.28.full.jpg","provider_image_id":"ingredients_en","provider_entity_id":"5000159551724","asset_url":"/uploads/images/product/05000159551724/ingredients-1f5d9eda.jpg"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"nutrition","note":null,"asset":"nutrition-c0aabaec.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:59.168Z","stored_width":1600,"stored_height":1000,"original_width":2150,"matched_barcode":"5000159551724","original_height":1344,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/nutrition_en.24.full.jpg","provider_image_id":"nutrition_en","provider_entity_id":"5000159551724","asset_url":"/uploads/images/product/05000159551724/nutrition-c0aabaec.jpg"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"back","note":null,"asset":"back-7a79f303.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:31:01.230Z","stored_width":1334,"stored_height":600,"original_width":1334,"matched_barcode":"5000159551724","original_height":600,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/packaging_en.22.full.jpg","provider_image_id":"packaging_en","provider_entity_id":"5000159551724","asset_url":"/uploads/images/product/05000159551724/back-7a79f303.jpg"}],"data":{"meta":{"title":"Mars Duo 78.8 g two-bar pack (5000159551724)","description":"The British and Irish Mars Duo, 2 x 39.4 g: label ingredients, nutrition per 100 g and per bar, allergens, maker and where it is sold."},"about":"Mars Duo 78.8 g is the two-bar pack of the Mars bar for Britain and Ireland: two 39.4 g bars of milk chocolate (40%) with soft nougat (32%) and a caramel centre (27%) in one wrapper, the recipe Forrest Mars Sr. first made in Slough in 1932.[^off-label][^wp-mars] The manufacturer's specification, titled for the GB and IE markets, gives Mars in Slough as the maker and the United Kingdom as the country of origin, packed 32 to a case.[^erudus] The wrapper prints a British consumer block for Mars Wrigley Confectionery UK and an Irish one for Mars Foods Ireland, and each bar carries 174 kcal.[^off-back][^off-label] It is labelled suitable for vegetarians.[^off-label]\n\nThe Duo replaced the single king-size Mars bar; when Wikipedia described the range as of 2008 it weighed 85 g.[^wp-mars] A London convenience store sold it at GBP 2.15 in September 2026, and the Irish discount chain MrPRICE listed it online at EUR 1.49.[^devo][^mrprice]","claims":[{"kind":"label","note":"Printed after the ingredient statement.","claim":"Suitable for Vegetarians","source":"^off-label","observation":"label-2025"}],"images":[{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"front","note":null,"asset":"front-32f1036f.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:56.205Z","stored_width":1600,"stored_height":248,"original_width":3518,"matched_barcode":"5000159551724","original_height":545,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/front_en.26.full.jpg","provider_image_id":"front_en","provider_entity_id":"5000159551724"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"ingredients","note":null,"asset":"ingredients-1f5d9eda.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:57.060Z","stored_width":1600,"stored_height":209,"original_width":3789,"matched_barcode":"5000159551724","original_height":494,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/ingredients_en.28.full.jpg","provider_image_id":"ingredients_en","provider_entity_id":"5000159551724"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"nutrition","note":null,"asset":"nutrition-c0aabaec.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:30:59.168Z","stored_width":1600,"stored_height":1000,"original_width":2150,"matched_barcode":"5000159551724","original_height":1344,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/nutrition_en.24.full.jpg","provider_image_id":"nutrition_en","provider_entity_id":"5000159551724"},{"url":"https://world.openfoodfacts.org/product/5000159551724","kind":"back","note":null,"asset":"back-7a79f303.jpg","source":"open-food-facts","licence":"cc-by-sa-3.0","accessed":"2026-09-25","upscaled":null,"attribution":"Open Food Facts contributors","observation":null,"download_url":null,"match_method":"barcode","retrieved_at":"2026-09-25T19:31:01.230Z","stored_width":1334,"stored_height":600,"original_width":1334,"matched_barcode":"5000159551724","original_height":600,"match_confidence":1,"source_image_url":"https://images.openfoodfacts.org/images/products/500/015/955/1724/packaging_en.22.full.jpg","provider_image_id":"packaging_en","provider_entity_id":"5000159551724"}],"aliases":[{"from":null,"name":"Mars Duo","type":"search","until":null,"locale":"en"},{"from":null,"name":"Mars Duo Chocolate Bar 2 x 39.4g","type":"search","until":null,"locale":"en"},{"from":null,"name":"Mars Chocolate Duo Bar 78.8g","type":"search","until":null,"locale":"en"},{"from":null,"name":"Mars Bar Duo","type":"search","until":null,"locale":"en"}],"markets":[{"note":"GB-marked consumer block with the UK freephone 0800 952 0077 and Freepost Mars Wrigley Confectionery UK Ltd.","price":null,"origin":null,"source":"^off-back","status":"printed","country":"GB","observed":"2025-09-13","condition":null},{"note":"The Grocery Store, Wembley, London HA9: Mars Duo, 78.8 g, in stock; the listing URL carries this barcode.","price":"GBP 2.15","origin":null,"source":"^devo","status":"sourced","country":"GB","observed":"2026-09-25","condition":"new"},{"note":"Manufacturer specification titled \"MARS Duo 32x2x39.4g GB IE\", inner component GTIN 5000159551724 in an outer case of 32 (case GTIN 5000159551717), country of origin United Kingdom.","price":null,"origin":"GB","source":"^erudus","status":"sourced","country":"GB","observed":"2024-11-15","condition":null},{"note":"IE-marked consumer block for Mars Foods Ireland Ltd, PO Box 3856, Dublin 4, with the Irish number 1890 812 315.","price":null,"origin":null,"source":"^off-back","status":"printed","country":"IE","observed":"2025-09-13","condition":null},{"note":"MrPRICE, the Irish discount chain's online shop, lists \"Mars Duo Chocolate Bar 2 x 39.4g\" with this barcode as its product barcode and SKU, at EUR 1.49, shown as sold out online.","price":"EUR 1.49","origin":null,"source":"^mrprice","status":"sourced","country":"IE","observed":"2026-09-25","condition":"new"},{"note":"Amazon.co.uk ASIN B01ET7KD1K \"Mars Duo 78.8g\", 78.8 g pack of 1, under Grocery > Food Cupboard > Snacks & Sweets > Chocolate Candy > Blocks & Bars, manufacturer Mars Wrigley Confectionery UK; name, brand and net content match but the page prints no barcode, and the earlier Duo code 5000159470490 is an equal match. Shown as currently unavailable, with no price.","price":null,"origin":null,"source":"^amazon-uk","status":"derived","country":"GB","observed":"2026-09-25","condition":"new"}],"identity":{"gtin":"05000159551724","name":"Mars Duo 78.8 g","brand":"brand/mars","family":"family/mars-bar","summary":"The British and Irish two-bar Mars Duo, 2 x 39.4 g of caramel and nougat in milk chocolate, made in the United Kingdom by Mars Wrigley Confectionery UK.","category":"category/10000045","last_seen":"2026-09-25","net_content":{"unit":"g","value":78.8},"pack_format":"two-bar wrapper","piece_count":2,"last_seen_note":"In stock at GBP 2.15 at The Grocery Store, Wembley, London, on Devo.","country_of_sale":["GB","IE"],"country_of_origin":["GB"],"default_observation":"label-2025"},"research":{"note":"Built from the Open Food Facts photographs (2024 to 2025), the manufacturer-supplied Erudus specification, a Devo shop listing, the MrPRICE online shop, the Amazon storefronts and the family page's sources.","reviewed_on":"2026-09-25","structure_version":2},"allergens":[{"note":"Emphasised in bold in the ingredient list (skimmed milk powder, whey permeate (milk), milk fat).","source":"^off-label","allergen":"milk","declaration":"contains","observation":"label-2025"},{"note":"Emphasised in bold: barley malt extract.","source":"^off-label","allergen":"barley","declaration":"contains","observation":"label-2025"},{"note":"Emphasised in bold: emulsifier (soya lecithin).","source":"^off-label","allergen":"soya","declaration":"contains","observation":"label-2025"},{"note":"Emphasised in bold: egg white powder.","source":"^off-label","allergen":"eggs","declaration":"contains","observation":"label-2025"},{"note":"\"(May contain: peanuts and other nuts)\".","source":"^off-label","allergen":"peanuts","declaration":"may_contain","observation":"label-2025"},{"note":"\"(May contain: peanuts and other nuts)\".","source":"^off-label","allergen":"nuts","declaration":"may_contain","observation":"label-2025"},{"note":"May contain almonds, Brazil nuts, cashews, hazelnuts, macadamia, pecans, pistachios and walnuts, each listed separately.","source":"^erudus","allergen":"nuts","declaration":"may_contain","observation":"erudus"},{"note":null,"source":"^erudus","allergen":"peanuts","declaration":"may_contain","observation":"erudus"}],"relations":[{"from":null,"note":"Wikipedia names Mars Inc. as the producer of the Mars bar, sold worldwide outside the United States.","role":"brand_owner_at_sale","ended":null,"until":null,"market":null,"source":"^wp-mars","status":"sourced","target":"company/mars-incorporated"},{"from":null,"note":"The back prints a GB-marked block, \"Get in touch: 0800 952 0077, www.mars.co.uk/contact, Freepost Mars Wrigley Confectionery UK Ltd.\"","role":"food_business_operator","ended":null,"until":null,"market":["GB"],"source":"^off-back","status":"printed","target":"company/mars-wrigley-confectionery-uk"},{"from":null,"note":"The back prints an IE-marked block, \"Mars Foods Ireland Ltd, PO Box 3856, Dublin 4. Contact us: https://ire.mars.com/, 1890 812 315\".","role":"marketed_by","ended":null,"until":null,"market":["IE"],"source":"^off-back","status":"printed","target":"company/mars-foods-ireland"},{"from":null,"note":"The Erudus specification gives the manufacturer as Mars at 3d Dundee Road, Slough, SL1 4LG, the registered office of Mars Wrigley Confectionery UK, and the country of origin as United Kingdom.","role":"manufactured_by","ended":null,"until":null,"market":null,"source":"^erudus","status":"sourced","target":"company/mars-wrigley-confectionery-uk"},{"from":null,"note":"Prefix 5000159; GS1's GDSN trading-partner list gives GLN 5000159000000 to MARS CHOCOLAT FRANCE, as the company page states.","role":"gs1_prefix_owner","ended":null,"until":null,"market":null,"source":"^gs1-gdsn","status":"sourced","target":"company/mars-wrigley-confectionery-france"}],"references":[{"ref":"off","url":"https://world.openfoodfacts.org/product/5000159551724","kind":"catalogue","title":"Open Food 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stock","accessed":"2026-09-25","upstream":null,"published":null,"publisher":"Devo","record_id":"5000159551724","attribution":null},{"ref":"mrprice","url":"https://www.mrprice.online/products/mars-duo-chocolate-bar-2-x-39-4g","kind":"retailer","title":"Mars Duo Chocolate Bar 2 x 39.4g, MrPRICE.online","licence":null,"locator":"EUR 1.49, sold out online","accessed":"2026-09-25","upstream":null,"published":null,"publisher":"MrPRICE","record_id":"5000159551724","attribution":null},{"ref":"amazon-uk","url":"https://www.amazon.co.uk/dp/B01ET7KD1K","kind":"retailer","title":"Mars Duo 78.8g : Amazon.co.uk: Grocery","licence":null,"locator":"model number 105896211, currently unavailable","accessed":"2026-09-25","upstream":null,"published":null,"publisher":"Amazon.co.uk","record_id":"B01ET7KD1K","attribution":null},{"ref":"gs1-gdsn","url":"https://www.gs1.org/docs/gdsn/stats/gdsn_trading_partners.pdf","kind":"registry","title":"GDSN trading partners: GS1 GDSN member companies and their 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syrup"},{"id":"l3","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":3,"parent_id":null,"ingredient":"ingredient/skimmed-milk-powder","observation":"label-2025","printed_name":"skimmed milk powder"},{"id":"l4","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":4,"parent_id":null,"ingredient":"ingredient/cocoa-butter","observation":"label-2025","printed_name":"cocoa butter"},{"id":"l5","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":5,"parent_id":null,"ingredient":"ingredient/cocoa-mass","observation":"label-2025","printed_name":"cocoa mass"},{"id":"l6","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":6,"parent_id":null,"ingredient":"ingredient/sunflower-oil","observation":"label-2025","printed_name":"sunflower oil"},{"id":"l7","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":7,"parent_id":null,"ingredient":"ingredient/whey-permeate","observation":"label-2025","printed_name":"whey permeate (milk)"},{"id":"l8","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":8,"parent_id":null,"ingredient":"ingredient/palm-fat","observation":"label-2025","printed_name":"palm fat"},{"id":"l9","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":9,"parent_id":null,"ingredient":"ingredient/butterfat","observation":"label-2025","printed_name":"milk fat"},{"id":"l10","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":10,"parent_id":null,"ingredient":"ingredient/fat-reduced-cocoa-powder","observation":"label-2025","printed_name":"fat-reduced cocoa powder"},{"id":"l11","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":11,"parent_id":null,"ingredient":"ingredient/barley-malt-extract","observation":"label-2025","printed_name":"barley malt extract"},{"id":"l12","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":12,"parent_id":null,"ingredient":"ingredient/salt","observation":"label-2025","printed_name":"salt"},{"id":"l13","from":null,"kind":"label","note":null,"role":"emulsifier","basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":13,"parent_id":null,"ingredient":"ingredient/soy-lecithin","observation":"label-2025","printed_name":"emulsifier (soya lecithin)"},{"id":"l14","from":null,"kind":"label","note":null,"role":null,"basis":null,"state":"known","until":null,"market":null,"source":"^off-label","percent":null,"position":14,"parent_id":null,"ingredient":"ingredient/egg-white-powder","observation":"label-2025","printed_name":"egg white powder"}],"observations":[{"id":"label-2025","kind":"label","note":"Read from the Open Food Facts ingredients (imgid 9), nutrition (imgid 7) and front (imgid 8) photos uploaded 2025-10-30; the back photographed on 2025-09-13 (imgid 4) prints the same statement above the GB and IE consumer blocks, and the nutrition table photographed on 2025-03-27 (imgid 3) prints the same figures.","label":"GB and IE wrapper, photos 2025","market":["GB","IE"],"source":"^off-label","status":"supported","language":"en","observed":"2025-10-30","valid_from":null,"net_content":{"unit":"g","value":78.8},"pack_format":"two-bar wrapper","piece_count":2,"valid_until":null,"model_number":null,"pack_quantity":null,"ingredients_text":"Milk chocolate (40%) with soft nougat (32%) and caramel centre (27%). Ingredients: sugar, glucose syrup, skimmed milk powder, cocoa butter, cocoa mass, sunflower oil, whey permeate (milk), palm fat, milk fat, fat-reduced cocoa powder, barley malt extract, salt, emulsifier (soya lecithin), egg white powder. (May contain: peanuts and other nuts). Milk chocolate contains milk solids 14% minimum. Milk chocolate contains vegetable fats in addition to cocoa butter. Suitable for Vegetarians.","ingredients_declaration":"listed","ingredients_exempt_basis":null},{"id":"erudus","kind":"label","note":"Erudus record 11011, version 2.0, changed and reviewed 2024-11-15, supplied by the manufacturer; manufacturer product code 453945; inner component weight 0.08 kg, 32 units per outer case, shelf life 364 days from production; the statement matches the wrapper word for word.","label":"Manufacturer specification on Erudus (GB IE)","market":["GB","IE"],"source":"^erudus","status":"supported","language":"en","observed":"2024-11-15","valid_from":null,"net_content":{"unit":"g","value":78.8},"pack_format":"two-bar wrapper","piece_count":2,"valid_until":null,"model_number":null,"pack_quantity":null,"ingredients_text":"Sugar, Glucose Syrup, Skimmed MILK Powder, Cocoa Butter, Cocoa Mass, Sunflower Oil, Whey Permeate (MILK), Palm Fat, MILK Fat, Fat-Reduced Cocoa Powder, BARLEY Malt Extract, Salt, Emulsifier (SOYA Lecithin), EGG White Powder, Milk Chocolate contains Milk Solids 14% minimum, Milk Chocolate contains Vegetable Fats in addition to Cocoa Butter","ingredients_declaration":"listed","ingredients_exempt_basis":null}],"research_gaps":[{"state":"disputed","detail":"The typed Open Food Facts values for this barcode (722.7 kJ, 532 kcal, 6.3 g fat, 27 g carbohydrate, 24 g sugars, 1.8 g protein, 0.67 g salt per 100 g) mix the per-bar column with other figures and contradict the photographed table, so they are not used.","domain":"nutrition","source":"^off","observation":null},{"state":"unknown","detail":"Searched amazon.ie on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (with a Dublin delivery address): no single Duo pack was found; B01ET7KD1K answers 404 there, and the only Duo listing, B0074FP87E, is a box of 32 bars at EUR 62.99 from London Food Hall Ireland, printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"Searched amazon.co.uk on 2026-09-25 for \"Mars Duo 78.8g\", \"Mars\" and 5000159551724 (the barcode search returned no results). Besides the unavailable single B01ET7KD1K, the Duo listings are boxes of 32 (B0074FP87E at GBP 31.99 from Kidzkandy) and B00WUEQ69I \"Mars Chocolate Duo Chocolate Bar, 79 g\", unavailable and printing no barcode.","domain":"markets","source":null,"observation":null},{"state":"unknown","detail":"The US import shop Brits R U.S. lists \"Mars Bar Duo\" with this barcode as its SKU, shown out of stock on 2026-09-25; no US storefront was searched, so US is not in country_of_sale.","domain":"markets","source":"https://britsrus.com/shop/mars-bar-duo/","observation":null}],"nutrition_panels":[{"id":"label-100","note":"Portions per pack: 2.","basis":{"unit":"g","value":100},"label":"Per 100 g","source":"^off-label","basis_note":null,"basis_state":"as_sold","declaration":"transcribed","observation":"label-2025","exempt_basis":null},{"id":"label-bar","note":"Percentages are of the reference intake the label prints with an asterisk.","basis":{"unit":"g","value":39.4},"label":"Per 39.4 g 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(9%)"},{"note":null,"panel":"label-bar","state":"known","value":174,"method":"printed","source":"^off-label","nutrient":"energy_kcal","qualifier":null,"value_max":null,"dv_percent":9,"printed_value":"174kcal (9%)"},{"note":null,"panel":"label-bar","state":"known","value":6.3,"method":"printed","source":"^off-label","nutrient":"fat_g","qualifier":null,"value_max":null,"dv_percent":9,"printed_value":"6.3g (9%)"},{"note":null,"panel":"label-bar","state":"known","value":3,"method":"printed","source":"^off-label","nutrient":"saturated_fat_g","qualifier":null,"value_max":null,"dv_percent":15,"printed_value":"3.0g (15%)"},{"note":null,"panel":"label-bar","state":"known","value":27,"method":"printed","source":"^off-label","nutrient":"carbohydrate_g","qualifier":null,"value_max":null,"dv_percent":10,"printed_value":"27g (10%)"},{"note":null,"panel":"label-bar","state":"known","value":24,"method":"printed","source":"^off-label","nutrient":"sugars_g","qualifier":null,"value_max":null,"dv_percent":27,"printed_value":"24g (27%)"},{"note":null,"panel":"label-bar","state":"known","value":1.8,"method":"printed","source":"^off-label","nutrient":"protein_g","qualifier":null,"value_max":null,"dv_percent":4,"printed_value":"1.8g (4%)"},{"note":null,"panel":"label-bar","state":"known","value":0.27,"method":"printed","source":"^off-label","nutrient":"salt_g","qualifier":null,"value_max":null,"dv_percent":5,"printed_value":"0.27g 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