Mars Duo
Prefix 500 was issued by GS1 UK. It tells you where the code was registered, not where the product was made.
Nutrition
| Nutrient | 100 g | Reference intake |
|---|---|---|
| Energy | 532 kcal | 27% |
| Fat | 6.3 g | 9% |
| of which saturates | 3.0 g | 15% |
| Carbohydrate | 27.0 g | 10% |
| of which sugars | 24.0 g | 27% |
| Protein | 1.8 g | 4% |
| Salt | 0.67 g | 11% |
Open Food Facts, ODbL, record updated 17 June 2026 · Reference intakes: Regulation (EU) No 1169/2011, Annex XIII.
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).
Source: Open Food Facts, ODbL · additive names and functions: Open Food Facts taxonomy.
Prices reported by shoppers
| Date | Price | City |
|---|---|---|
| 30 October 2025 | £1.50 | London |
Prices are entered by Open Prices contributors from receipts and shelf labels; they vary by shop and by date.
Source: Open Prices (Open Food Facts), ODbL
Climate impact
Reference value for the category “Candy chocolate bars”: 6.18 kg CO₂e per kg of product (closest product in Agribalyse).
Calculated by ADEME for the average product consumed in France, from field to plate. It describes the category, not this exact product.
Source: Agribalyse 3.1 (ADEME), Licence Ouverte, update of 30 June 2026 · category match: Open Food Facts taxonomy.
Countries of sale
Source: Open Food Facts, countries of sale reported by contributors.
Sources
- Product record
- PhotoOpen Food Facts contributors, CC BY-SA
- Reference valuesReference intakes: Regulation (EU) No 1169/2011, Annex XIII.
- GS1 prefixPrefix ranges published by GS1
Spotted an error? It is fixed at the source, on Open Food Facts, and shows up here at the next update.