The company said the certification adds banned substance screening to its existing quality assurance program while leaving the product formulation unchanged. Basic Prenatal contains 5-methyltetrahydrofolate (5-MTHF), a bioactive form of folate used to support maternal and fetal health. Explore related questionsBringing sports certification into prenatal nutritionNSF Certified for Sport independently tests dietary supplements to help verify label claims and screen for substances banned by many athletic organizations. Bioactive folate and formulation strategyThe certification also highlights growing interest in ingredient forms within prenatal supplements. Instead, she said Thorne selected 5-MTHF because it is the active form of folate and has been part of the company’s prenatal formulation since 2016.