I am homozygous for both MTHFR C677T and CBS C699T and was wondering what are the best forms of B12, folate and iron to take during pregnancy as I am low in all 3. I read that methyl forms may not be suitable for those with CBS C699T but not sure if that is true or not. Anything high in sulphur and folate reacts in me so my diet is low sulphur, and no gluten or dairy. At the minute I only take probiotics. Any advice appreciated. It seems easy to find advice on one of the mutations but not the two together. Thank you