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Tripeptides such as GHK-Cu have an established safety record in topical and cosmetic applications, showing low cytotoxicity and reduced skin irritation compared with other copper compounds, and acceptable tolerability in clinical cosmetic studies [23, 74, 93]

Injection site reactions (redness, swelling, tenderness) are most common but typically resolve quickly

Van Den Boogaard, M

Capsules are generally considered less invasive but may have different absorption and efficacy compared to injectable forms

In gliomas, however, the adaptive immune response is blunted and misdirected

Wright Willis A, Evanoff BA, Lian M, Criswell SR, Racette BA