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injecting vitamin b12 subcutaneous Treating Severe Deficiency Best Vitamin B12 Injection Site:
Description
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Folate (aka folic acid/vitamin B9 NB: Folic acid is the synthetic form of B9, found in supplements and fortified foods

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Additionally, if you are someone with eating disorders, which means insufficient overall calorie intake, this can also cause low B12

Camille Kotton, an infectious diseases doctor at Massachusetts General Hospital
