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Vitamin B 12 deficiency is preventable with supplements, which are recommended for pregnant vegetarians and vegans, and not harmful in others. [2] Risk of toxicity due to vitamin B 12 is low. [2] Vitamin B 12 deficiency in the US and the UK is estimated to occur in about 6 percent of those under the age of 60, and 20 percent of those over the ...
Registered dietitians explain what vitamin B12 is, how much you need, and the potential side effects of taking too much.
As a supplement it is used to treat vitamin B12 deficiency including pernicious anemia. [1] [2] Other uses include treatment for cyanide poisoning, Leber's optic atrophy, and toxic amblyopia. [3] [4] It is given by injection into a muscle or vein, [2] by pill or sublingually. Side effects are generally few. [2]
How fast B 12 levels change depends on the balance between how much B 12 is obtained from the diet, how much is secreted and how much is absorbed. The total amount of vitamin B 12 stored in the body is about 2–5 mg in adults. Around 50% of this is stored in the liver.
B12 is crucial for many important functions, and, with a few exceptions, the only way to get it is through animal-based foods or B12 supplements. “Vitamin B12 is an essential water-soluble ...
Vitamin B12 deficiency symptoms . Vitamin B12 deficiency has a few hallmark symptoms, according to doctors: Lack of energy. Mental fatigue. Nausea, vomiting, or diarrhea. Lack of appetite. Weight loss
Pernicious anemia is a disease where not enough red blood cells are produced due to a deficiency of vitamin B 12. [5] Those affected often have a gradual onset. [5] The most common initial symptoms are feeling tired and weak. [4]
Other ways to get extra B12. A prescription form of vitamin B12 can be given as an injection, notes the NIH—typically for people with deficiencies who also have problems absorbing vitamin B12 as ...