(National Institute of Health or NIH Vitamin B12 shots are normally available by prescription only, although dosage varies depending on age and medical history
Nakazaki, E., Mah, E., Sanoshy, K., Citrolo, D., & Watanabe, F
Injectable self-healing antibacterial bioactive polypeptide- based hybrid nanosystems for efficiently treating multidrug resistant infection, skin-tumor therapy, and enhancing wound healing
We have also showed that other markers of DNA damage/cell cycle (p21, p53, p57 and phospho-p57, GADD45, 8-OHdG), apoptotic (BCL-2, CASP-2, CASP-9) and anti-oxidant pathways (GP-1, SOD-1, HO-1, p38 stress kinase), that are not specifically associated with hair follicle pigmentation, have distinct expression patterns and colocalise to parts of the hair follicle such as the IRS, ORS, DP and cortex
One very important point: injectable B12 is primarily a medical treatment for a diagnosed deficiency