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Landtblom, et al

Nat Methods (2017) 14(4):4179

Injectable forms bypass the gastrointestinal tract, making them particularly valuable for individuals with malabsorption conditions such as pernicious anaemia, Crohn's disease, or following gastric surgery

What vitamin B 12 can't do The internet is full of articles lauding the use of vitamin B 12 to prevent Alzheimer's disease, heart disease, and other chronic conditions or reverse infertility, fatigue, eczema, and a long list of other health problems

The best result was a modest 2.6 kilograms in a short trial, and that result did not hold up in the larger, longer study designed to confirm it