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ON THIS PAGE What is Vitamin B12

Transdermal forms of vitamin B 12 are available over the counter, but this route of administration has not been validated clinically in the setting of vitamin B 12 deficiency and should not be relied upon for treatment

Ensuring that you have enough of vitamin B 12 is important for brain function and mental, bone, and eye health

Image: Michail_Petrov-96/Thinkstock Vitamin B12 may not be high on your nutritional radar, yet it is essential to some of the body's most important functions, like forming red blood cells and maintaining nerve function

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