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Vitamin D, especially in active forms like calcitriol, increases calcium levels and must be used carefully in renal patients
There was a tragic case of severe vitamin B12 deficiency in an infant born to a vegan mother who thought she was doing everything right taking a multivitamin that contained B12, though it may have also just been inadequate dosing
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Summary: There is no established scientific evidence that vitamin B12 supplementation or elevated B12 levels directly cause anxiety in most individuals
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