Vitamin B-12 - Mayo Clinic
www.mayoclinic.org › drugs-supplements-vitamin-b12Jul 17, 2021 · When taken at appropriate doses, vitamin B-12 supplements are generally considered safe. While the recommended daily amount of vitamin B-12 for adults is 2.4 micrograms, higher doses have been found to be safe. Your body absorbs only as much as it needs, and any excess passes through your urine.