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But it also explains why transition periods can look like worsening

GHK-Cu vs NAD+ for Anti-Aging: Where the Evidence Actually Stands Neither therapy has large-scale, long-term randomized controlled trial data in humans for anti-aging endpoints specifically

Heavy metal limits are strictly enforced, with USP standards requiring lead below 0.5 ppm, arsenic below 0.3 ppm, and mercury below 0.1 ppm

Researchers with existing copper metabolism concerns (e.g., Wilsons disease models) should account for this in their experimental design

Studies in the peptide have spurred numerous research hypotheses, which include possible sleep regulation via pineal gland stimulation, releasing more melatonin