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Vitamin B12 is an essential (it is required for the body to work properly) water-soluble vitamin commonly found in foods such as fish, meat eggs, and dairy products
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A published case series on cobalamin disorders described subcutaneous B12 as a gentle, easy-to-use alternative to intramuscular injections
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People with Certain Medications Long-term use of certain medications, like proton pump inhibitors, H2 receptor antagonists, or metformin, can interfere with B12 absorption
Green et al 26 Severe clinical abnormalities should be treated intensively with B 12 , cyanoB 12 or hydroxyB 12 : HydroxyB 12 is commonly used in Europe, often at intervals of 23 months, as it seems to have better retention than cyanoB 12
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