What nitrous oxide gas is and how it is used during labor for pain relief. What studies have found about the safety and effectiveness of nitrous oxide during labor. The potential pros and cons of using nitrous oxide gas for pain relief during labor To find out if there's a Savvy Birth Workshop near you, visit the Evidence Based Birth® Facebook page and click on "Events." You can also see if there is an Instructor near you by visiting directory.evidencebasedbirth.com