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These studies show that people with higher levels of vitamin D have a lower risk of disease, although they do not definitively prove that lack of vitamin D causes disease or that vitamin D supplements would lower risk
For example, epithelial tight junctions (TJ) can be altered by several pathogens (Table 3)
In addition, oral supplements are generally cheaper and more accessible
B12 injections deliver the vitamin directly into the bloodstream, bypassing digestion
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