b12 injection side effects fatigue Why do I feel worse after a injection? Are B12 Shots Safe? Royal

The B12 intravenous dose is usually the same as the intramuscular dose, from 1000 mcg to 2500 mcg per infusion

If you take vitamin B12 supplements, let your doctor know so they can tell you how much you need, and make sure they won't affect any medicines you're taking

Oral doses of 1000 g deliver 5 to 40 g, even if taken with food

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They are not intended for human or animal consumption, clinical use, diagnostic use or therapeutic application

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