Determining the appropriate amount of vitamin B12 to take depends on several factors, including age, health status, and dietary habits
Tsai PS, Wang SY, Wang MY, Su CT, Yang TT, Huang CJ, et al
Typically given by injection under veterinary guidance, it helps support energy metabolism and overall health
It is most widely encountered as a cosmetic ingredient in topical skincare formulations, where it is used under cosmetic-ingredient rules rather than as an approved therapeutic
FDA reviewers found no human clinical studies supporting its proposed wound-healing uses
General recommendations are for 2.4 micrograms (mcg) a day, although those who are elderly or breastfeeding women may need more