The Mayo Clinic says vitamin B12 plays an essential role in red blood cell formation, cell metabolism, nerve function and the production of DNA.
Although a vitamin B12 deficiency is something which can be dangerous, people should be careful not to take too many supplements.
The Mayo Clinic states: “Most people get enough vitamin B12 from a balanced diet. “However, older adults, vegetarians, vegans and people who have conditions that affect their ability to absorb vitamin B12 from foods might benefit from the use of oral supplements.”
It adds vitamin B12 supplements are also sometimes recommended for women who are pregnant or breastfeeding exclusively and follow vegetarian or vegan diets.