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The verdict: GHK-Cu for skin, collagen peptides for hair/nails Choose GHK-Cu if: Skin anti-aging is primary goal Want injectable or topical option Focused on wrinkles and firmness Choose collagen peptides if: Want overall beauty benefits Prefer oral supplementation Hair and nails are priority Best peptide combinations and stacks Combining peptides provides synergistic benefits
Han H, Zhao Y, Du J, Wang S, Yang X, Li W, et al
It's so dumb
10 Witschi A, Reddy S, Stofer B, Lauterburg BH
A cause-and-effect relationship has not been established but some striking associations were recently found based on consumption levels
Brain-derived neurotrophic factor and antidepressant drugs have different but coordinated effects on neuronal turnover, proliferation, and survival in the adult dentate gyrus
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