A normal individual is able to control iron absorption despite high intake. Only individuals with underlying disorders have increased iron absorption that run the risk of iron overload with oral administration. Adverse reaction to B-complex vitamins are rare.
Hypersensitivity reaction with thiamine (Vitamin B1) are rare and have been reported mostly with parenteral administration. Allergic reactions to pyridoxine vitamin (B6) have been reported. Treatment with Cyanocobalamin may unmask signs of polycythaemia Vera.
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