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Vitamin B12 deficiency can also result from poor nutrition, cancer, HIV, during pregnancy, old age, due to alcoholism
Changing injection spots also reduces the risk of tissue damage and discomfort, making the whole process less painful and easier to stick with over time
Whos At Risk
Nat Genet 1994
How to Switch from Pills to Injections If you have been taking oral supplements but still feel tired, foggy, or "off," it may be worth reevaluating, ideally starting with a test rather than a guess
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