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Oral supplements have to survive your digestive system before reaching your bloodstream, and studies show most vitamins are only 20 to 50% absorbed that way

While vitamin B12 has the power to lower the risk of heart disease, it is also linked to the fact that individuals with healthy levels of Vitamin B12 are more likely to spend time outdoors and exercise

ShimomuraTKondoJOchiaiMNakaDMiyazawaKMorimotoYet al

When injected, B12 is easily absorbed by the body and then utilized in the formation of red blood cells as well as aiding in the maintenance of a healthy nervous and cardiovascular system

Anodal ctDCS resulted in reduced amplitudes and prolonged latencies of the N1 and N2/P2 components in EEG recordings, whereas cathodal stimulation led to increased amplitudes and shortened latencies of the same components

It could boost oxygen flow to your brain and stimulate your nervous system