http://mthfr.net/
Methylation defects reduce the person’s ability from properly detoxifying, repairing the damage and fighting the infection and co-infections. This explains the severe symptoms that come and go in some people, and why some folks herx so badly and others don’t.
One process of methylation turns on and off genes, this means it affects your DNA (genetic code). The ability to methylate helps you process toxins and hormones. For example, estrogen… you make it in your body, and you also get it from xenobiotics (chemicals in shampoos, pesticides, herbicides, plastics and more) if you can’t break down estrogen and get it OUT of your body, you could develop all sorts of disorders.