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Everything else marketed for brain aging, from NAD+ precursors and senolytics to metformin, rapamycin, and CoQ10, has either failed in human trials or has not been tested in the brain at all, which is why those belong in the promotion section below rather than here

Instead GHK seems to have a more multi-faceted effect on many different systems

Readers with active cancer, a history of cancer, or elevated cancer risk should consult an oncologist before considering any peptide product

Aging adults experiencing a decline in muscle mass or strength

Immune System Modulation Several peptides are being investigated for their immunomodulatory properties

The optimal concentration for over-the-counter products typically ranges from 0.1% to 2% GHK-Cu, with many studies suggesting 0.5% as an effective sweet spot for benefits without adverse reactions