Our take

Generally safe

Most people get enough vitamin B-12 from a balanced diet. But older adults and people who follow vegetarian or vegan diets may find it helpful to take vitamin B-12 supplements. People who have conditions that keep them from absorbing nutrients, such as celiac disease or Crohn's disease, also may find that vitamin B-12 supplements are helpful.

Vitamin B-12 supplements also are suggested for women who are pregnant, who are breastfeeding and not using any formula, or who follow vegetarian or vegan diets.

Taking high doses of vitamin B-12 can cause side effects. A person should only take higher doses if a healthcare professional recommends doing this.