A daily dose of 5 mg folic acid for 90 days is associated with increased serum unmetabolized folic acid and reduced natural killer cell cytotoxicity in healthy Brazilian adults - Paniz, Clovis; Bertinato, Juliano Felix; Lucena, Maylla Rodrigues; Carli, Eduardo de; Amorim, Patrícia Mendonça da Silva; Gomes, Guilherme Wataru; Palchetti, Cecilia Zanin; Figueiredo, Maria Stella; Pfeiffer, Christine M; Fazili, Zia; Green, Ralph; Guerra-Shinohara, Elvira Maria (Journal of Nutrition, 2017)