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what do b12 injections look like Vitamin B12 Injection Sites: All
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However, it doesnt absorb well, and requires a methyl donor (a natural antidote and an antagonist for toxins) to detoxify it before it can convert to one of the useful forms of B12

10.1210/clinem/dgz324 50 SmitD

However, it has been studied as a way to treat obesity via its ability to reduce appetite

Lumenal lipid metabolism: implications for lipoprotein assembly
