What dose of folic acid should i start with, i'm 8 weeks pregnant?

Folic acid: 1 mg per day is sufficient. 0.8 mg per day is minimum.

Prenatal vitamins: The prenatal vitamin you are taking has the correct amount of folic acid. You need all the vitamins in there but not extra folate.

That depends: Is this your first pregnancy and if not have you had a child with a defect of the nervous system? If this is your first pregnancy and all else is normal, then you should take 400 micrograms of folic acid per day. In fact, that is the recommendation for all adults to take each day. If you've had one child with a birth defect of the brain or spine then take 4 miligrams of folic acid per day b4 prego

0.4mg = 400mcg: Assuming that you do not have children affected by neural tube defect like Spina Bifida, you should be taking 0.4mg of folic acid (folate) once a day. The dose may be written as 400 mcg. In addition to the prenatal vitamin, consume a healthy diet with natural sources of folic acid. Consult your doctor if you have a child with a neural tube defect, because you may need a higher dose of folate.