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Methylcobalamin is less stable than cyanocobalamin and is particularly susceptible to photodecompositionthat is, destruction from light exposure

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"You could have knocked me over with a feather when I found out that some people were starting to get better because it was just so outside what we were expecting." They are not alone

In this regard, serum vitamin B 12 and holo-TC should be avoided as sole markers of B 12 deficiency in neonatal screening

Dietary sources The main foods which provide vitamin B12 are derived from animals, such as dairy products and eggs