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"Peptides need to be from a physician and a compounding pharmacist, and not, from what I've heard, a business card in the men's bathroom," said Elizabeth Yurth, co-founder of the Boulder Longevity Institute

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Heavier individuals with more subcutaneous fat may need longer needles to reach the subcutaneous layer

A clinical study of 21 women using a topical GHK-Cu gel for 3 months showed an average 28% increase in collagen and elastin density , with the top quartile achieving a 51% improvement, as reported by EurekAlert