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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

Relative bioavailability, on the other hand, compares the bioavailability of a drug across multiple forms in the same circumstances (and where 100% bioavailability has been arbitrarily allocated to a single form)

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