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Even if a person is not deficient in Vitamin B12, as defined by a blood test, the symptoms of a B12 deficiency may include: Feeling weak or tired Problems with vision Headaches Pins and needles Reduced mental functions Wish to check you vitamin B12 levels
BMC Bioinform
But the consequences of using a suboptimal topical are generally limited to skin irritation and wasted money rather than systemic harm
Reactions are more likely during the intensive loading phase simply because the doses are close together
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