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To the support team's credit, the answer was direct, succinct, and complete

Laboratory studies show GHK-Cu treatment results in improved hair shaft diameter, enhanced cuticle structure regularity, increased cortical density, and superior overall fiber integrity, translating into hair that appears thicker, stronger, and more resistant to breakage in experimental models

Ighodaro, O

Peptides naturally occur in tissues like the gut , brain , muscles , and immune system , but can also be synthesized and modified for therapeutic or performance-enhancing purposes

These effects are often modest in isolation, reinforcing the rationale for coordinated, multi-level intervention