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The trade-off is practical: MK-677 is oral, requires no injection skill, costs less, and produces faster visible changes that make compliance easier in human trials
Is GHK-Cu third-party tested
However, in practice, investigators could only introduce a small amount of stratification and could not balance all important variables simultaneously (23)
PT 141 is not approved for postmenopausal women
Analysis of gene expression data has suggested that GHK-Cu may up-regulate genes associated with repair and regeneration while down-regulating genes associated with inflammation and cellular damage
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