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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

Nguyen, T

Why are we still in need of novel anti-obesity medications

The findings suggest the oral option can deliver weight loss comparable to the once-weekly injectable version already available

Retatrutide is likely to follow the same pattern, with private availability from late 2027 to mid-2028, and NHS access from 2029