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doi: 10.1016/S1473-3099(10)70026-8

doi: 10.1007/s12325-008-0136-5

European journal of nutrition, 54(2), 251263
Some medicines can decrease the absorption of vitamin B12, let your doctor know all other medicines you are taking to make sure you are safe

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Those with known allergy to B12 or cobalt should avoid
