MTHFR (MethyleneTetraHydroFolate Reductase)   10 signs you may be positive for the MTHFR gene mutation: Mood imbalances Brain fog Chemical sensitivity Elevated homocysteine levels Hair-trigger temper Heavy periods Cramps Hypothyroidism Infertility Irritability   MTHFR is a critical gene. It enables more than 200 of your body’s vital processes like methylation,...