One study: showed an increased risk of cancer. "Cancer incidence and mortality after treatment with folic acid and vitamin B12." Ebbing M, Bønaa KH, Nygård O, Arnesen E, Ueland PM, Nordrehaug JE, Rasmussen K, Njølstad I, Refsum H, Nilsen DW, Tverdal A, Meyer K, Vollset SE JAMA. 2009;302(19):2119. Thanks for trusting HealthTap!
Answered 8/31/2015
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