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GHK without copper is noticeably cheaper but mechanistically different confirm the COA specifies the Cu-bound complex
USA 86 , 14341438 (1989)
Studies showing that plasma cysteine is significantly lower in children with autistic disorder are dominated by one research group that published three studies (one in children with abnormal methylation or GSH:GSSG) [4648] and their findings have been replicated by another research group [60]
Handler P, Brabander D
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