Many of these symptoms are not specific to B12 deficiency but can also occur in other disorders
Andreeff M , Tafuri A, Goodacre A, Escudier S, Leahy M, El-Naggar A, Van N, Collins C, Estey E
ADVERSE REACTIONS: Intramuscular injection can cause skin rashes, itching, diarrhea, and allergic asthma
Hum Reprod (Oxford, England) 27:13911400 Lane M, McPherson NO, Fullston T, Spillane M, Sandeman L, Kang WX, Zander-Fox DL (2014) Oxidative stress in mouse sperm impairs embryo development, fetal growth and alters adiposity and glucose regulation in female offspring
This collagen stimulation extends beyond simple quantity GHK-Cu also promotes production of dermatan sulfate, chondroitin sulfate, decorin, elastin, and glycosaminoglycans, all of which are critical structural components of the extracellular matrix