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It also helps keep your hair, nails, and skin healthy

And while you can get it from your diet, many people still don't get enough

Nerve cells require vitamin B1 in order to function normally

doi:10.1038/285017a0

Laboratory Testing Schedule Lab tests are key to checking if B12 injections are working

Other factors that could lead to B12 deficiency are: Lack of adequate production of the intrinsic factor needed for B12 absorption B12 deficiency is common in elderly people as absorption of the vitamin reduces with age People who have had any intestinal surgery, such as that for weight loss Those with gut conditions such as Crohn's Disease, inflammatory bowel disease, or celiac disease QUESTION See Answer Vitamin B12 injections Vitamin B12 supplements are given based on the condition that causes deficiency