side effects of too much b12 injections do have Vitamin B12: Is It Bad for Your Health? – Vitamin B12: Symptoms, Dosage &

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Here are some of the vitamin B12 supplements your doctor may give you: Vitamin B12 injections (typically, 1 to 2 mg of hydroxocobalamin injected into your muscles every other day for two weeks) Vitamin B12 tablets (once your levels are stabilized) Folate (your body needs folate to process vitamin B12 and vice versa) L-methionine (B12, folate, and L-methionine work together) Your doctor may also want to check to see if you need other treatments because of a problematic immune response or another deficiency

doi: 10.1016/j.lfs.2017.08.006