why are im injections used for b12 Best Vitamin Injection Sites: Where to Inject B12 · PA Relief Instruction Guide for Intramuscular (IM)

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Homocysteine Homocysteine is another way to assess Vitamin B12 levels, it is not as specific as MMA because high homocysteine levels can also indicate a deficiency in B2, B6, folate, and B12

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B12 levels can decrease with age, as well as being lower in people who have undergone weight loss surgery, or suffer from pernicious anaemia, Crohns or celiac disease