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Because GHK-Cu, the anchor, shows benefit in research that tracks with steady, repeated exposure rather than with any single large dose

10.1016/j.ccr.2010.04.008 24 BergeronR

Health benefits of selected minerals

The nuance is that the body synthesizes carnitine and most people have adequate baseline carnitine levels from dietary intake (primarily from red meat) the supplemental benefit is most pronounced in vegetarians and vegans (who have significantly lower dietary carnitine intake), older adults (whose carnitine synthesis declines with age), athletes in high-volume training (who deplete carnitine more rapidly), and anyone in a caloric deficit where fatty acid oxidation demand is elevated relative to carnitine availability.

By serving as a direct precursor to glutathione, the body's master antioxidant, NAC offers a targeted approach to supporting liver detoxification, neutralizing neuroinflammation, and rescuing exhausted cellular energy pathways