[44] In the cytosol [edit] Methylcobalamin and 5-methyltetrahydrofolate are needed by methionine synthase in the methionine cycle to transfer a methyl group from 5-methyltetrahydrofolate to homocysteine, thereby generating tetrahydrofolate (THF) and methionine, which is used to make SAMe
Subcutaneous amounts are community research practices, not an approved clinical protocol
In borderline cases, methylmalonic acid or homocysteine levels may be tested
They are particularly beneficial for vegetarians and vegans (since B12 is found primarily in animal products), older adults with reduced absorption capacity, individuals with digestive conditions such as Crohn's disease or celiac disease, and anyone who has had gastric bypass surgery
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They could interact with other medicines or health issues