At least 400 mcgs for most adults - pregnant women 600 mcgs and breastfeeding women should get at least 500 mcgs.
Children need between 150 to 300 mcg per day.
Folate and folic acid are both forms of B9. Folate occurs naturally in fresh foods, whereas folic acid is the synthetic form found in supplements. Your body needs folate to produce red blood cells, as well as components of the nervous system. It helps in the formation and creation of DNA and maintaining normal brain function, and is a critical part of spinal fluid. It has also been proven to reduce the risk for an NTD-affected (neural tube defect) pregnancy by 50 to 70 percent. Folic acid is vital for proper cell growth and development of the embryo. That is why it is important for a woman to have enough folate/folic acid in her body both before and during pregnancy.