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Vitamin B12 is an essential nutrient that plays a key role in energy production, brain function, and the formation of healthy red blood cells
If you have a temporary deficiency or increased requirement (say, after a surgery or during recovery from an acute illness), you might only need a short course, perhaps a few weeks of injections, until your vitamin levels normalize or you can meet your needs by mouth again
But despite their frequent comparison, they are fundamentally different compounds with distinct mechanisms of action
Sci Rep 12 , 484 (2022)
If you are low or deficient in B12, restoring healthy levels may improve fatigue and energy over time
Chemical interactions between peptides can cause degradation or precipitation
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