Question: 1 mg folic acid is how many mcg?
Answer: Folic Acid Dosage Most over-the-counter supplements of folic acid are 400 mcg tablets. Prescription folic acid for pregnant women is usually for 1 mg (i.e., 1,000 mcg) tablets. Adults over 18, including pregnant women, should not take more than 1,000 mcg of folic acid a day.