Last reviewed May 2026 · 1 min read
Is N-Acetyl Cysteine (NAC) vegan?
Also known as: Acetylcysteine
Vegan
Suitable for a vegan diet.
Yes — Commercial NAC is produced synthetically.
01 · The basics
What is N-Acetyl Cysteine (NAC)?
A supplement form of the amino acid cysteine, used heavily by the liver to produce the master antioxidant glutathione.
02 · The source
Where it comes from
Commercial NAC is produced synthetically. Unlike some L-cysteine (from feathers), NAC is vegan.
03 · Alternatives
Best vegan alternatives
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Frequently asked
FAQ
Is NAC vegan?
Yes, while standard L-Cysteine can be derived from feathers, the acetylated form (NAC) used in supplements is produced synthetically and is vegan.
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