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One of the best known is GHK-Cu, a naturally occurring copper tripeptide that helps your body repair and renew itself from the inside out

Support for neurological health, including potential protective effects on the brain

doi:10.3390/biomedicines9060609 Hsieh MJ, Lee CH, Chueh HY, et al

Liquid Is a Real Quality Signal The chemistry behind this rule of thumb: peptides in aqueous solution are vulnerable to hydrolysis (water attacking the amide bonds of the peptide backbone), oxidation of susceptible residues (methionine, cysteine, tryptophan), and aggregation

Strous RD, Maayan R, Lapidus R, Stryjer R, Lustig M, Kotler M et al (2003)