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It plays a major role in a number of the body's essential functions including DNA synthesis and the formation of red blood cells to transport sufficient amounts of oxygen to its various tissues to prevent fatigue and weakness. Methylcobalamin works even better when taken along with the HCG shots
These include adverse reactions to anesthesia and infection
It is cheaper, more widely available, and has been the workhorse of B12 supplementation for decades
[1] Marginal deficiency is much more common and may occur in up to 40% of Western populations
Certain drugs may also interfere with lab tests for vitamin B12 levels
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