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J Clin Endocrinol Metab 88:34013408

Although B12 injections have been used for decades as the fastest way to raise B12 levels, the latest research is saying that well chosen forms of oral B12 will probably work just as well

A deficiency in vitamin B12 may cause tiredness, weakness, constipation, loss of appetite and megaloblastic anemia

As it is not regulated by the FDA, researchers must do their due diligence and look closely at the company's practices and standards

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B-Complex Cautions and Warnings B vitamins are generally well tolerated with instances of sensitivity being rare