I take Solgar folate (ingredients list the source of folate as the brand name Metafolin). The bottle I have is 800mcg per tablet, and I take 2-3 each day. A fairly large percentage of the population (like 25-30% maybe?) cannot properly use synthetic folic acid in their bodies. In those individuals, the synthetic folic acid can even build up and block receptors from taking in natural folate from food sources, which can put them at greater risk of health issues, as well as increasing the risk of birth defects during pregnancy. There are tests that can show if you have the genetic mutation that causes this (mthfr gene mutation), but just to be safe I would recommend taking an activated form of folate anyway. It can't hurt, but it could certainly be helpful if your methylation process is impaired in any way.