Leucine
Function: Flavour enhancers
E641 is the European food-additive number for Leucine, a flavour enhancer — used to bring out the existing taste of a food. Leucine (E641) is a food additive used as a food additive.
What is E641 used for?
Leucine (E641) is a flavour enhancer — used to bring out the existing taste of a food. It is added during food production for a technological purpose rather than for nutrition. See all Flavour enhancers (E-numbers).
Is E641 safe or restricted?
E641 is an approved food additive in the EU and currently carries no special regulatory restrictions in the EU additive register. Forkin classifies it as “No known concern” and does not make health claims. See the methodology for how regulatory levels are assigned, or the guide to how EU additives are approved, re-evaluated and banned.
Is E641 vegan or vegetarian?
Leucine (E641) is typically produced from plant, mineral, or synthetic sources, so it is generally suitable for vegans and vegetarians.
The production source can vary between manufacturers — the Forkin app shows the verified vegan and vegetarian status per product. Always read the label for allergens.
Which foods contain E641?
E641 appears in 541 of the 4.7 million products in Forkin's catalogue — most often in Dietary Supplements, Protein Powder / Shake, and Electrolyte / Sports Drink.
- Dietary Supplements155
- Protein Powder / Shake149
- Electrolyte / Sports Drink45
- Energy Drink44
- Vitamins & Supplements31
- Pre-Workout14
- Sugar-Free Sweeteners13
- Pudding / Flan8
Often appears alongside
Additives most frequently found in the same ingredient lists as E641 across the catalogue.
Counts reflect Forkin's independently enriched product catalogue and update as new products are added — they are not a market-share statistic.
Frequently asked questions about E641
- What is E641?
- E641 is the E-number for Leucine, a flavour enhancer — used to bring out the existing taste of a food. Leucine (E641) is a food additive used as a food additive.
- What is E641 used for?
- Leucine (E641) is a flavour enhancer — used to bring out the existing taste of a food. Manufacturers add it during processing rather than for nutrition. The Forkin app shows which products in your scan history actually contain it.
- Which foods contain E641?
- E641 appears in 541 of the 4.7 million products in Forkin's catalogue — most often in Dietary Supplements, Protein Powder / Shake, and Electrolyte / Sports Drink. Scan any barcode with the Forkin app to see instantly whether a specific product contains it.
- Is E641 vegan or vegetarian?
- Leucine (E641) is typically produced from plant, mineral, or synthetic sources, so it is generally suitable for vegans and vegetarians. The Forkin app shows the verified vegan and vegetarian status per product, since the source can vary between manufacturers.
- Is E641 safe, and is it banned anywhere?
- E641 is an approved food additive in the EU and currently carries no special regulatory restrictions in the EU additive register. Forkin classifies it as ‘No known concern’ and does not make health claims — see the methodology page for how regulatory levels are assigned, and the Forkin app for the full profile, including acceptable daily intake (ADI) and restrictions by country.
See the full profile in Forkin
The Forkin app surfaces the full regulatory profile of E641 — acceptable daily intake (ADI), restrictions by country, vegan and vegetarian status, alternative names, and which products in your scan history contain it. See view pricing.