All studies by the NIH (220 Current Studies) have all been with the whole body cryotherapy chamber treatments, not with liquid nitrogen units.
The National Institutes of Health, PubMed (NIH) features over 200 clinical studies on Whole Body Cryotherapy in the walk-in refrigerated (non-nitrogen) systems. If you are interested in learning more, we recommend you visit their website to do your own review.
Disclaimer: Information contained within this website and on all US Cryotherapy printed material is for informational purposes only. US Cryotherapy does not recommend cold therapy as a form of treatment for any illness or disease without direction from your healthcare professional. All material contained within this site is copyrighted. All rights reserved. The cold therapy products and equipment have not been tested or approved by the FDA or any other government agencies.
Use at your own risk.