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GHK-Cu purity assessment requires both peptide purity analysis (RP-HPLC, 98% typical for the tripeptide) and copper content verification
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Comparable to therapy with GLP-1RA, a stepwise dose escalation starting with a low starting dose was associated with a lower rate of gastrointestinal side effects and better tolerability of tirzepatide (67)
However, this meta-analysis included only one RCT 43 and one case-control study 51 for GLP-1RAs (but not the more recent semaglutide) 41
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