What is NAC (N-acetylcysteine)?

The short answer

NAC is a lab-made form of cysteine, one of the small units that make up protein.

What it is
Cysteine source for glutathione.
What people look into
Aging

2 sources
Status as of October 4, 2026
How we source
Ellum doesn't sell peptides.

By Ellum EditorialUpdated October 11, 2026AI use

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Peptides: NAC (N-acetylcysteine) (1 selected) · edit

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What it is

Type: Amino-acid derivative (not a peptide)
How it works: Cysteine source for glutathione.

Regulatory status

Supplement How we label status

As of October 4, 2026, NAC (N-acetylcysteine) is sold in the US as a dietary supplement.

See NAC (N-acetylcysteine) in the Index →

Federal (FDA): Dietary supplement under FDA enforcement discretion

References

Sources as of October 4, 2026