Last reviewed May 2026 · 1 min read
Is Glycine vegan?
Also known as: Aminoacetic acid, E640
E-number: E640
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Source can be plant or animal.
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It depends — It can be produced synthetically (vegan) or extracted from hydrolyzed protein (often animal-derived gelatin).
01 · The basics
What is Glycine?
The simplest amino acid, used in food as a flavor enhancer or as a supplement to support sleep and joint health.
02 · The source
Where it comes from
It can be produced synthetically (vegan) or extracted from hydrolyzed protein (often animal-derived gelatin). Commercial E640 often requires manufacturer confirmation.
03 · Alternatives
Best vegan alternatives
Synthetic glycine
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Frequently asked
FAQ
Is E640 (Glycine) vegan?
It can be both. Synthetic glycine is vegan, but it can also be made from animal gelatin. Checking for a vegan label is the only way to be sure.
Does glycine help with sleep?
Yes, scientific studies suggest that taking glycine before bed can improve sleep quality by slightly lowering core body temperature.
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