23andMe

23andme is a direct-to-consumer genetic testing service. Consumers buy a kit, provide a saliva sample, ship it to the company, and they then provide online access to important (but very small) portions of the person's genetic data and limited interpretations based on the genetic profile. Their web site explains how it works.

Testing for Methylation Defects
Some have hypothesized (Methylation cycle hypothesis) that the Methylation cycle may be defective due to genetic effects in some ME/CFS patients, particularly related to the MTHFR gene.

Online Presence

 * 23andme USA/global
 * 23andme UK