Healing2015
Dr. William Walsh published a book in 2012. The title is "Nutrient Power: Heal Your Biochemistry and Heal Your Brain". It seels on Amazon.
If you want to know more about Walsh's research go the website of the Walsh Research Institute. The site has articles that you can download.
Walsh protocol should be used by a doctor trained on it. To know if you have more than pyroluria you need to have specific blood exams. I believe that irine is the test for pyroluria.
On the Mensah Medical website you can also find some information about undermethylation and overmethylation. Drs. Mensah and Bowman worked with Dr. Walsh, and they follow this research protocol.