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The oxidase-like activity of Fe 3 O 4 and FeSAN as the comparative nanozymes were also evaluated at the same amount of Fe in pFeSAN (Supplementary Fig

In addition, administrative and regulatory fees in Western countries are relatively high, so the price increases proportionally

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

Supplied as lyophilized powder vials, injectables, capsules, or sprays and used exclusively in laboratory and in-vitro research settings not drugs, supplements, or therapeutic products

Lin X, Ping J, Wen Y, Wu Y