NAC (N-acetyl-L-cysteine) is a modified form of the amino acid cysteine commonly used as an ingredient in dietary supplements. Formulations and amounts vary by brand; review the product label.

Is NAC the same as glutathione?

No. NAC (N-acetyl-L-cysteine) and glutathione are different ingredients. Although related, they are not the same compound.

What should I know before choosing a NAC supplement?

Review the product label for important warnings, precautions and directions for use. If you have questions about whether NAC is appropriate for you, consult your healthcare provider before use.

What forms does NAC come in?

NAC is available as standalone capsules, powders and in combination formulas paired with ingredients such as glycine.

Is NAC the same in every product, or do forms vary?

NAC is generally sold as a single, standardized compound rather than having multiple chemically distinct forms the way minerals like zinc or magnesium do. Differences between products mostly come down to the amount per capsule, other paired ingredients, and capsule versus powder format.