Associations of genetic determinants of serum vitamin B12 and folate concentrations with hay fever and asthma: a Mendelian randomization meta-analysis.
Tea SkaabyAmy E TaylorRikke K JacobsenLine T MøllehaveNele FriedrichBetina H ThuesenDaniel Mønsted ShabanzadehLavinia PaternosterUwe VölkerMatthias NauckHenry VölzkeMarcus MunafòTorben HansenOluf PedersenTorben JørgensenNiels GrarupAllan LinnebergPublished in: European journal of clinical nutrition (2017)
Our results did not support the hypothesis that levels of vitamin B12 and folate are causally related to hay fever, asthma, or biomarkers of allergy, but we found evidence of a positive association between serum folate and serum total IgE.