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In general, some people at risk of deficiency include those who have had intestinal surgery, including weight loss surgery, diseases that affect the gut, such as Crohns disease or celiac disease, and older people who eventually lose the ability to absorb vitamin B12
An immune response and, ultimately, T-cell-mediated killing of cancer cells are triggered when the tumor antigens are displayed on the surfaces of cancer cells
That way, you spend $9.99 on a useful product instead of spending $9.99 on shipping
arXiv preprint arXiv:1812.05576