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There are two forms of B12 used in injections: methylcobalamin and cyanocobalamin
This is because: Older adults make less stomach acid, which is needed for B12 absorption
Supplement: Which is More Effective
Mosby's manual of diagnostic and laboratory tests
It is primarily found in products including lean beef, fatty fish, dairy, eggs and fortified foods meaning that we can get a steady supply of it, provided that we eat the right foods
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