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Hair regrowth is fundamentally a slow process because follicles must complete full growth cycles

Due to concerns including potential immunogenicity, peptide aggregation, heavy metal impurity control, and copper accumulation risks, injectable GHK-Cu Copper Tripeptide-1 remains under strict regulatory control

Tian, J

Hsieh et al., 2017

A good dermatologist will check your skin type, allergies, and health conditions before suggesting the treatment or changing the strength for sensitive skin.

They are real compounds with a real but geographically narrow and hard-to-audit evidence base, which is exactly why an honest tier list puts them in the middle rather than the top or the bottom