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Most B vitamins we take from food and they are eliminated regularly in the urine. Still overdose of these vitamins, when the great amount is taken can be harmful for one’s health.

Let’s see most harmful effects from taking a great dose of B vitamins. B1 or thiamin has shown no toxicity even in high-dose injections into the vein or muscle.

B2 or riboflavin also has shown no evident toxicity in human body, it, however, has certain side effects, when taken in large doses. B2 produces reactive oxygen species when exposed to UV light.

Large doses of B3 or niacin (nicotinamide) can cause nausea, vomiting, and signs and symptoms of liver toxicity. Other side effects include glucose intolerance, and visual problems. Vitamin B3 can also cause allergic reactions- flushing, including redness of the skin, often accompanied by an itching, tingling, or mild burning sensation. It can cause headaches, pain and increased intracranial blood flow.

B5 and B7 according to results of the clinic researches have shown not toxicity. B6 or pyridoxine effects are not proved. Cobalamin or B12 overdose can result in acne-like rash.

All in all, there are no proved clinical results of the B vitamins toxicity. Still the overdose or uncontrolled usage of these vitamins can lead to serious health damage.