N-acetyl-L-cysteine on its own, at the strength most formulas use.

NAC is the acetylated form of the amino acid cysteine, and it is the rate limiting piece the body uses to make glutathione. One ingredient, in a capsule with no binders or fillers.

It comes as 60 vegetarian capsules. Metabolic Maintenance works out of Sisters, Oregon, and has made practitioner-only supplements since 1984, with no binders, fillers or added excipients in the capsule.

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