This document provides information on MTHFR, a genetic mutation affecting the MethyleneTetraHydroFolate Reductase enzyme. It discusses how the mutation originated and spread, now affecting 85% of some populations. It describes how the mutation is actually a DNA transcription error that impacts methylation, an important enzyme function. The rest of the document outlines a 14-step protocol for treating homozygous MTHFR using various supplements to support methylation pathways.