how often to give b12 injections Injection Frequency: Should You Get a Shot? Are B12 Shots Safe? Royal

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Dipeptidyl peptidase-4 inhibitors and gallbladder or biliary disease in type 2 diabetes: systematic review and meta-analysis (BMJ)

If you follow a vegan diet, B12 is not found naturally in fruit, vegetables or grains, so fortified foods or a supplement matter more, and seaweed, spirulina and similar products are not reliable sources

Federici M, Porzio O, Zucaro L, Giovannone B, Borboni P, Marini MA, Lauro D, Sesti G

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But, if a consistent supply of B12 is not available (which is the case in exclusively breastfed infants of B12-deficient mothers), B12 stores become depleted in the baby by 4 to 7 months of age