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Jun 30 2012;147(3-4):136-46

Vegetarians/vegans and patients with digestive disorders, taking certain medications like Metformin, or have low stomach acid are often deficient in B vitamins

Naturally found in human plasma, this complex combines three vital amino acids: glycine, histidine, and lysine, with copper ions to act as a "signal peptide." In the ecosystem of the scalp, GHK-Cu functions as a biological architect, sending specific instructions to cells to initiate repair, dampen inflammation, and jumpstart the hair production cycle

If your deficiency is caused by metformin, you should take vitamin B12 injections either subcutaneously or intramuscularly