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It is particularly common among older demographics, where skin becomes less effective at producing Vitamin D, or among people with darker complexions
For skin , GHK-Cu has solid evidence for collagen and repair
Stretch marks improve modestly in color, less so in texture
They may also have subclinical conditions that could be affected by metabolic changes
[10] Muscle Regeneration (Neelakantan 2019): 510 mg/kg, 13 weeks (aged 24-month mice with acute injury)
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