MTHFR and early-onset autosomal dominant Alzheimer disease: Despite this, MTHFR genotyping is available from 50 certified labs in the USA [98], and testing is widely promoted in the naturopathic field, where patients are told that a “faulty genotype” may explain a list of symptoms and diseases including “anxiousness, adrenal fatigue, brain fog, cervical dysplasia, increased risk of many cancers, low thyroid, leaky gut, high blood pressure, heart attacks, stroke, Alzheimer’s disease, diabetes, and miscarriages” (https://sciencebasedmedicine.org/dubious-mthfr-genetic-mutation-testing/).