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However, it is hard to precisely predict its influence on the energy level of a specific patient

When you take Vitamin B12 through an intramuscular injection, you can process 100% of that vitamin, whereas with an oral supplement, usually only about 50-70% of the vitamin is able to be processed and metabolized

Supplements and foods reinforced with this vitamin contain B12 in its free form, which makes it more readily available for absorption in your system

Boost in Energy Levels Low levels of B12 often drag people down with constant exhaustion or sluggishness

doi: 10.3390/cosmetics4020016

The compound did not appear to affect food intake, behavior, or general health status in treated animals