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( Wiley Online Library ) Where the evidence is still a bit thin Topical anti-wrinkle outcomes: a 2025 review on topical GHK as an anti-wrinkle peptide points out practical limitations (like stability and penetration) and highlights that clinical studies are surprisingly limited compared to how widely its promoted
P., Tuttle, T
Creatine supplementation has been shown to down-regulate the synthesis of l-arginine : glycine amidinotransferase and consequently reduce endogenous formation of creatine, changing the methylation flux and reducing Hcy synthesis ( Reference Taes, Delanghe and De Vriese 6 , Reference Stead, Au and Jacobs 20 )
17 studies were initially identified, but 10 studies were excluded due to lacking or unusable data
no human safety data exists and no formal pharmacokinetic study has been published in any species
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