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Overproduction of Haptocorrin Finally, some cases show the over production of other molecules which also bond to vitamin B12, most commonly the so-called haptocorrin or R-binder, to which transcobalamin I and III belong

Cyanocobalamin versus Methylcobalamin Cyanocobalamin is a synthetic form of vitamin B12 found only in supplements, while methylcobalamin is a naturally occurring form that you can get through either food sources or supplements

If you have a collection of symptoms that may require further investigation it may be beneficial to seek blood tests via your GP or private route/self testing

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1 2 "Biological properties of vitamin B 12 "