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Vitamin B12 is a water-soluble vitamin that, like the other B vitamins, contributes to red blood cell formation and helps maintain the proper functioning of the nervous system and a normal metabolism.
This micronutrient supports healthy skin, nails and hair. It also helps prevent megaloblastic anaemia, a condition that causes fatigue and muscle weakness. The main food sources are meat, fish, eggs and dairy products. Vegans or those following a vegetarian diet should consider taking a supplement for this vitamin to achieve optimal intake levels.