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Additionally, testosterone can influence the size and activity of the sebaceous glands

Begin with alternate-day application and progress to daily use after two weeks without irritation

Anyone considering GHK-Cu should consult a qualified healthcare provider before starting, especially if pregnant, breastfeeding, or taking medications that affect growth factors, wound healing, or immune function

Each targets a distinct mechanism of skin aging, collagen synthesis, wound healing, or telomere maintenance, giving geroscience researchers a well-characterized toolkit for studying biological aging processes at the molecular level