topical ghk cu side effects “Is GHK-Cu actually worth it?” is genuinely one of the most common questions in my comments, so let me finally answer it properly., The short version: copper peptides have real research behind them, Copper Peptides For Skin: Benefits

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It is derived from a naturally occurring body protection compound found in gastric juice, which plays a role in maintaining gut integrity and tissue repair

Topical GHK-Cu typically requires consistent use for several weeks to months before noticeable improvements in skin texture, firmness, or hair quality become visible

But in chronic plantar fasciitis, the problem isn't primarily inflammation anymore

These compounds act on repair, inflammation, and stress response pathways that do not fit the single-indication logic of FDA drug approval