Gary Brecka: www.youtube.com/watch?v=w-QCm7rAOyo
medlineplus.gov/genetics/gene/mthfr/
23andMe: blog.23andme.com/articles/our-take-on-the-mthfr-gene
Dr Rajsree Nambudripad: www.youtube.com/watch?v=Vlu7k-zhUd4