cons of ghk cu GHK-Cu Peptide GHK-Cu isn't a trend. It's

Pizzuti D, Bortolami M, Mazzon E, Buda A, Guariso G, DOdorico A, Chiarelli S, DInc R, De Lazzari F, Martines D

Vitamin B12 is Reducing the chances of developing vitamin B12 deficiency, and complications that may occur in the future as a result of vitamin B12 deficiency, such as: heart disease, nervous system diseases, vision loss, and problems in the nervous system of fetuses born to mothers with vitamin B12 deficiency

Your metabolism isnt broken its underpowered by hormonal shifts

No overdosage has been reported with Nascobal Nasal Spray, Nascobal (Cyanocobalamin, USP) Gel for Intranasal Administration or parenteral vitamin B12

If so, these may be signs of a vitamin B12 deficiency

Data were analyzed using GraphPad Prism 8.0 software and presented as mean standard error of the mean (S.E.M.)