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Taking 2mg or less a day of vitamin B12 in supplements is unlikely to cause any harm.

Completely different mechanism, which is part of why some people consider running both (more on that in a moment)

Elevating the head of the bed 6 to 8 inches provides overnight gravitational protection

We used a Mendelian randomization design to test whether this relation might be causal

Sub q should in theory give close to 100% bioavailability, but we really dont know the one PK study never tested it, so theres no measured number and no dosing conversion behind it

Vitamin B12 (cyanocobalamin) is unique it is the only one that contains the mineral cobalt