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The strongest human evidence is topical, including the Leyden 2002 photoaging trial and a 2023 IRB-approved 21-woman topical NEEL gel study reporting an average 28% increase in skin collagen density at 3 months

Glutathione is a tripeptide, consisting of three amino acids, that is produced in the liver and plays a critical role in protecting the body from oxidative stress

This aligns with their ability to minimize inflammation and accelerate dermal remodeling

First identified in human plasma in the 1970s, GHK-Cu demonstrates remarkable biological versatility

SKU: GHKCU $69.00 Third-Party Verified 99% Purity Research-Grade GHK-Cu is a copper-binding peptide complex widely studied for its structural and biochemical relevance

Low zinc levels have been linked to slower cold and flu recovery, increased pneumonia risk, greater susceptibility to skin infections, and poor vaccine response in older adults