Natural Factors - Folic Acid 1000 mcg. - 90 Tablets Natural Factors Folic Acid is used for the production of DNA and red blood cells making it essential during pregnancy for normal fetal development. It supports brain and nervous system function and benefits mental health. Folic Acid is also needed for protein metabolism and may support cardiovascular health. What is folic acid?Folic acid is a B vitamin needed for cell replication and growth.