Folic acid, the synthetic form of folate, is not good for people with the MTHFR mutation. It is found most commonly in enriched flour,  enriched corn flour, or enriched rice  products. This includes bread, pasta, pastries, cookies, breakfast cereal, baking flour, tortillas, and enriched rice. Also, be sure to check your energy drinks, meal replacements, and protein powders because folic acid is often added to those products. Another strange one, is orange juice. IF it’s fresh squeezed then it’s high in natural folate, which is great for MTHFR, but if it’s processed then it likely has added folic acid.   If the nutritional lable says “folate” or “folic acid” anywhere, then it’s always folic acid because it is the form of folate that is shelf-stable.