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Dr. Mercola has been providing quality products since 2001. The Quatrefolic® form of folate is what’s known as a “4th generation” 5-MTHF. Our Folate 5 mg provides 5,000 mcg (5 mg) of Quatrefolic®5-MTHF Folate. That’s the equivalent of 5,000 mcg of folic acid.