Last reviewed May 2026 · 1 min read
Is L-Leucine vegan?
Also known as: E641
E-number: E641
Check the Label
Source can be plant or animal.
See all check label ingredients →
In short
It depends — Can be extracted from duck feathers/hair or produced via fermentation.
01 · The basics
What is L-Leucine?
An amino acid used as a flavor modifier and tableting lubricant.
02 · The source
Where it comes from
Can be extracted from duck feathers/hair or produced via fermentation. Verification needed.
Frequently asked
FAQ
Is E641 vegan?
Verification needed.
Commonly found in
TabletsSugar-free foods
Share
More in this category
Other processing aid / flavoring ingredients
Keep exploring
Related ingredients
E422 (Glycerol / Glycerin)
Check the Label
A sweet, syrupy liquid used as a humectant in foods and cosmetics.
E920 (L-Cysteine)
Check the Label
A dough conditioner used in commercial bread baking.
Calcium Carbonate
Check the Label
A common mineral used as a white food coloring, an anti-caking agent, and a calcium supplement.
What's next