how b12 injections work Vitamin and Weight Loss: Does it Work? How Quickly Does a B12

A 2020 preclinical toxicity review found no serious toxicity in mice, rats, rabbits, or dogs at tested doses, but longterm human carcinogenicity or organtoxicity data are missing

There can also be minor irritation at the injection site, such as redness or soreness

Alston CL, et al

The National Institute of Health (NIH) shares that the recommended dietary allowance (RDA) for vitamin B12 is: Infants 06 months: 0.4 microgram Infants 712 months: 0.5 microgram Toddlers 13 years: 0.9 microgram Children 48 years: 1.2 micrograms Children 913 years: 1.8 micrograms Adult men and women over age 14: 2.4 micrograms Women who are pregnant: 2.6 micrograms Women who are breastfeeding: 2.8micrograms For adults over 50 years old, the NIH recommends taking a daily vitamin B12 supplement or consuming foods fortified with vitamin B12