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Some of the most common complaints include: Headache Swelling Rash Facial flushing Itchy skin Dizziness Numbness Diarrhea Vomiting High blood pressure Cold symptoms Anxiety Causes of Vitamin B12 Overdose Vitamin B12 is a water-soluble vitamin, which means that when we ingest too much of it, the excess amounts are flushed out of the body through urine

But whether youre not consuming enough through diet or not absorbing it properly, a B12 deficiency can spell trouble in several areas - including digestive problems

You can find the signs of a weak immune system here

A world of difference: a history of homocysteine research