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COA verification is particularly important for GHK-Cu because the active compound requires precise copper-to-peptide ratios: too little copper reduces efficacy while excess free copper in a preparation could cause local tissue irritation or contribute to systemic copper accumulation in patients with impaired copper metabolism

& Pluth, M

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For instance in the SCALE trials, non-completing patients typically discontinued liraglutide 3.0 mg due to tolerability issues, whereas non-completing patients typically discontinued placebo due to lack of effect, and there are no strong arguments to suggest that the patients who discontinued placebo would also have been the patients who would experience tolerability issues had they been randomized to liraglutide 3.0 mg instead

Nature Medicine, 2015