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GHK-Cu has a shorter window due to its copper component
Unusually for a peptide it is stable in gastric acid, which is why it has been studied across both systemic and gastrointestinal injury models
Some people experience breathlessness, dizziness, or heart palpitations due to reduced red blood cell production
Initial rapid improvement often slows after 2 to 3 weeks as the easy gains resolve and deeper repair continues
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