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The three compounds can be sourced and reconstituted separately, which allows independent dosing but adds cold-chain items and sterile draws
There is no standardized product to study, which is part of why the evidence base is so thin
These include: Vegetarians and vegans- Because b12 is found in meat, fish and dairy products, people following a plant based diet may struggle to eat enough food containing b12, leaving them susceptible to developing a deficiency
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