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In fact, its been found that B12 supplements taken orally are just as effective as intramuscular shots in overcoming states of deficiency when you take up to 1,000 micrograms a day

This results in less energy for the muscles and organs, leading to a general feeling of exhaustion

However, because this product provides doses far above the daily nutritional requirements (for instance 100 mg of B vs an RDA of ~1.4 mg), its use in pregnancy must be carefully considered

Anything more than that, and you need to speak up

There are almost no circumstances under which a course of B12 injections would not be beneficial to your health

[DOI] [PubMed] [Google Scholar] 33.Hay G, Clausen T, Whitelaw A, Trygg K, Johnston C, Henriksen T, Refsum H