We find Vitamin B11 - also known as folic acid - mainly in green vegetables. Spinach, Brussels sprouts and broccoli are the richest sources, but eggs, whole wheat bread and various types of meat also contain significant amounts of folic acid. Our Active Folic Acid contains 400 mcg of Quatrefolic®, the best absorbable folic acid available worldwide. An extremely accessible dosage for those who want to become pregnant, or are already pregnant! Folate is the biologically active form of folic acid Folic acid is the synthetic form of vitamin B11. Folate is the so-called biologically available or active form of folic acid and therefore much better absorbable. Before our body can absorb folic acid, it has to go through two conversion processes. First from folic acid to dihydrofolate (DHF), then to tetrahydrofolate (THF) and finally to folate (5-MTHF). When you take folate in a supplement, it is immediately available to our body and therefore much more effective!