There are several forms of vitamin B12, including cyanocobalamin, which is the most common, as well as adenosylcobalamin, methylcobalamin, and hydroxycobalamin
One common indicator is persistent fatigue or weakness
Have sluggish thyroid function but are not candidates for thyroid hormone therapy
Oral supplements: can work for mild deficiency and maintenance in people who absorb B12 normally, but tend to take longer and are less reliable when absorption is impaired
Meats, eggs and dairy produce are reliable sources of unfortified B12
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