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Copper peptides (GHK-Cu) signal the body to produce more collagen and elastin, but they are not structural proteins themselves

[66,67] During melanogenesis, tyrosinase is responsible for the conversion of L-tyrosine to L-DOPA and subsequently to dopa-quinone, then the pathway bifurcates to produce eumelanin or phaeomelanin

Irregular Convex Hexagon Illustration of an irregular convex hexagon with symmetry

However, analysis of Google search trends reveals nearly 10 times as many searches for these compounds in 2025 compared with 2020 and studies suggest that the number of gym-goers using performance-enhancing drugs has more than tripled since 2014