MTHFR is an important genetic SNP, meaning a single nucleotide polymorphism. One of many important SNPS involved in methylation processes, it’s effects are far-reaching. MTHFR can affect fertility, creating a condition of autoimmune infertility or recurrent miscarriage, and affect embryo health, and implantation. MTHFR is also implicated in mental illness and neurological disease, metabolic processes, clotting, cardiovascular diseases and more. That being said, although MTHFR is certainly the most well known genetic SNP, there are multiple relevant SNPs, each of which may have different applications to disease in humans.