 front. You know, there's two forms of folic acid, sometimes referred to as vitamin B4, but more often folic acid is the synthetic form, and folate is what you find in foliage, green leafy vegetables and plants. And folate is the natural form. Folic acid is the synthetic form. Many foods are fortified with folic acid. Cheap vitamins contain folic acid. So there is some concern. Some studies have suggested that maybe if you have cancer, not a good idea to take