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Increased skin elasticity and firmness Loss of skin elasticity and firmness is a common concern associated with aging

Kaklamanos et al., 2021

GHK-Cu copper peptide the same ingredient high-end brands put in $300 serums, shown to make skin look visibly firmer and plumper

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[19] Fragile X syndrome: A 2015 Cochrane review of ALCAR in fragile X syndrome found only two placebo-controlled trials, each of low quality, and concluded that ALCAR is unlikely to improve intellectual functioning or hyperactive behavior in children with this condition