Rachel Earls, Ph.D., outlines the roles, science, and limitations of this powerful clinical tool for the selection of medication. They guide us on how a person metabolizes many medications, and so it helps get proper doses for better efficacy and fewer side effects. It does not predict outcome, but greatly assists with treatment choices. She speaks to the differences between labs that require a medical prescription versus the direct to the consumer labs. This is a fascinating scientific utensil. July 2024