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What a COA should show: For a raw GHK-Cu ingredient, a legitimate Certificate of Analysis should include HPLC purity (look for greater than 98 percent), mass spectrometry confirmation of the molecular weight (340.38 Da for the free tripeptide), copper content by ICP-MS, and heavy metal panel
JAMA 298:11801188 Lago RM, Singh PP, Nesto RW (2007) Congestive heart failure and cardiovascular death in patients with prediabetes and type 2 diabetes given thiazolidinediones: a meta-analysis of randomised clinical trials
It depends on their health, lab results, and how they respond to treatment
These typically resolve within a few days
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