Although vitamin B12 deficiency can be dangerous, people should be careful not to take too many supplements. The Mayo Clinic reports: “Most people get enough vitamin B12 from a balanced diet. “However, the elderly, vegetarians, vegans and people with diseases that affect their ability to absorb vitamin B12 from food can benefit from taking oral supplements.” She adds that vitamin B12 supplements are sometimes recommended for women who are pregnant or exclusively breastfeeding and are on a vegetarian or vegan diet.
