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If you started with very low levels, the early days may feel more noticeable than they would for someone simply maintaining
Taking B12 supplements along with B6 and folic acid can significantly lower your risk
Pills simply can't fix that
A doctor may use an intramuscular shot if: they cannot locate an appropriate vein the particular drug would irritate the veins the digestive system would render pills ineffective Intramuscular injections have other advantages too
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