can b12 injections cause low potassium What You Need to Know About Vitamin 3 Rare But Serious Side

Two useful B12 books "What You Need to Know About Pernicious Anaemia and B12 Deficiency" by Martyn Hooper Martyn Hooper is the chair of PAS (Pernicious Anaemia Society)

Vitamin B12 deficiency may also be due to: problems with absorption of vitamin B12 in the small intestine due to part or all of the small intestine being surgically removed or affected by disease (such as Crohns disease, coeliac disease or infection)

Vitamin B12 (Cobalamin) : Keeps nerves healthy, helps make red blood cells, and converts food into energy

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