I have MTHFR dysfunction and have developed sensitivities to almost everything. Chemical sensitivities, food sensitivities, smells, etc. I can only shower s few times a week and that makes me sick, wash my hair with baking soda, and mostly eat Coconut Greek yogurt, steak ems (no bread) can't eat any fruits or vegetables. Many meds bother me too. I have tried glutathione and it makes me worse, methyl used made me really sick. My vitamin b12 blood work shows its sky high (1200) which I know means it's not being absorbed. From reading the forums here it sounds like Metafolin has helped a lot of people. Where do I purchase it, what brand is best, and what is the best dose to start at? I have found with me smaller is better to start. For example most people take 100 mg of Diflucsn and I have to take 25 ng. I acknowledge you all aren't Drs and this is not be used in place of medical advice but your suggestions would be greatly appreciated.