Pfeiffer, C. M., Sternberg, M. R., Fazili, Z., Yetley, E. A., Lacher, D. A., Bailey, R. L., & Johnson, C. L. (2015). Unmetabolized Folic Acid Is Detected in Nearly All Serum Samples from US Children, Adolescents, and Adults(1)(2)(3)(4). J Nutr.

Pfeiffer, Christine M., Maya R. Sternberg, Zia Fazili, Elizabeth A. Yetley, David A. Lacher, Regan L. Bailey, and Clifford L. Johnson. "Unmetabolized Folic Acid Is Detected in Nearly All Serum Samples From US Children, Adolescents, and Adults(1)(2)(3)(4)." J Nutr 2015.

Pfeiffer, Christine M., et al. "Unmetabolized Folic Acid Is Detected in Nearly All Serum Samples From US Children, Adolescents, and Adults(1)(2)(3)(4)." J Nutr 2015.