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

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Injecting into muscle instead of subcutaneous fat changes the absorption rate

Those with certain health conditions may also need extra monitoring

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

Units = (2.4 / 2.5) x 100 = 96 units

95% CI, 0.82-0.99) (33)