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But unless you have a vitamin B12 deficiency, vitamin B12 injections aren't likely to give you an energy boost." Ironically, the National Institutes of Health says that symptoms of B12 deficiency include loss of appetite and weight loss

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You should know that as many as 50 % of Pernicious Anaemia Patients test negative for Intrinsic Factor Antibodies

In addition, local hypoxic, acidic, and low-glucose environments further augment energy metabolism reprogramming in tumor cells, which not only upregulates antiapoptotic proteins, including protein kinase B (Akt) and hexokinase 2 (HK2) but also inhibits the proliferation of T lymphocytes, facilitating tumor cell immune escape [198]