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But, the use of peptides raised concerns in self-experimentation and sports

While the etiology of skin fibrosis remains poorly understood, growing evidence supports the hypothesis that fibrosis arises from aberrant tissue injury (e.g., vasculopathy) and repair (e.g., wound healing) responses

A faint blue-green tint at the injection site is sometimes reported and is associated with the copper in GHK-Cu (cosmetic only)

The bioavailable vitamin B12 also provides immune system support

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W., Loro, E., Liu, L., Davila, A., Chellappa, K., Silverman, I
