is ghk cu systemic GHK-Cu - Peptide for Collagen, Healing & Anti-Aging Rejuvenate Your Skin and Hair
Description
The vastus lateralis muscle on the outer thigh

However, if you are sensitive to methylated nutrients or already reacting to supplements, starting with single-ingredient B12 may be safer before introducing a full B-complex

doi: 10.1515/BC.2009.033

Supplementation is not the only way to incorporate B12 into your routine
