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These hormones play vital roles in muscle repair, fat metabolism, cellular regeneration, and overall physical performance

Systematic elimination helps identify the actual cause

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

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

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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