Final answer:
Folic acid is the recommended supplement during pregnancy to reduce the risk of neural tube defects.
Explanation:
During pregnancy, the recommended supplement to decrease the risk of neural tube defects is folic acid. Folate is crucial for the healthy development of the neural tube, and a deficiency can lead to serious birth defects like spina bifida.
Learn more about folic acid supplementation during pregnancy here:
https://brainly.com/question/37790545
