Summary: Folic acid is a nutrient that pregnant women need to supplement. The human body cannot produce it on its own and needs to supplement it by taking folic acid from food. So, do you know the key points of correctly supplementing folic acid? Let’s take a look. Folic acid is a nutrient that pregnant women need to supplement. The human body cannot produce it on its own, so it needs to be supplemented with folic acid in food. So, do you know the key points of correctly supplementing folic acid? Let’s take a look. Five key points for correctly supplementing folic acid 1. Look for foods containing folic acid. These foods contain folic acid: green vegetables.