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Another study on collagen production showed that collagen production increased at in the group treated with GHK-Cu, while this rate was determined to be in the group treated with vitamin C cream, and in the group using retinoic acid
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When using dilute acetic acid (0.1% v/v) as a solvent, it can improve initial solubilization of certain peptide batches, but the solution pH should be adjusted to near-physiological range before administration to avoid tissue irritation at the injection site in animal models
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