The substances in The DP Plan are naturally found in the body. They are not pharmaceutical drugs, like Riluzole/Rilutek, and are not foreign chemicals being introduced into the body. Taking them at the published doses should not be harmful, provided that you do not have any other medical issues that would make you sensitive to any of the substances or a combination of them and provided that there are no contraindications with substances or drugs you are already consuming. You should check with your doctor to ensure that following The DP Plan is safe for you, specifically.