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As with many things, the individual will sort out the most effective method for them
Cold injections sting more
That makes GHK-Cu easier to research, easier to test, and easier to compare across vendors
Some researchers suggest alternating nights for GHK-Cu and retinoids, or using them at different times of the day, to prevent potential irritation or reduce the efficacy of certain compounds
Cell 122 , 579591 (2005)
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