can b12 injections make you nauseous Vitamin shots: Uses, benefits, and side effects Feeling tired, foggy, or run-down?
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One reason why folate and vitamin B12 are given together is because taking only one of these may hide a deficiency in the other

Some studies suggest that babies born to B12-deficient mothers may experience delays in speech, memory, and attention during early childhood [*]
Age: absorption naturally slows as we get older, so timing can shift over the years
