ghk cu collagen production How GHK-Cu Helps and Elasticity for Skin How Long Does GHK-Cu Last?
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If you have an allergy to any of the ingredients in Methylcobalamin Injection, avoid using it

Generally, sermorelin can stay at room temperature for a limited time (up to 1-2 days maximum for the unmixed powder, and usually less for the mixed solution

And this then could have led to gut leakiness

doi: 10.1177/20503121241253957, 5
A proposed two-phase stem cell model suggests copper-free GHK promotes stem cell replication and survival, while GHK-Cu (with copper) promotes differentiation

Therapeutic Advances in Psychopharmacology, 4 (5), 198219