it is naturally occurring, nontoxic, and is active at a very low nanomolar concentration.11 Another piece of research described GHK-Cu as a safe, inexpensive, extensively studied compound.3 These conclusions primarily apply to topical GHK-Cu, but even with injectables, the lack of serious adverse events in animal subjects points to a general tolerability regardless of the route of administration
Scientists continue to explore all this peptide has to offer
Each has its own logic, benefits, and drawbacks
Basel, Switzerland: MDPI: 185
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However, if you have insulin resistance or diabetes, you should still monitor blood sugar closely and consult a healthcare provider before use