Oxygenating Blood With Nitrate-Rich Vegetables

Is this something your doctor should have as an immediate stroke protocol? What is the downside?
Probably much better and easier than HBOT.
http://nutritionfacts.org/video/oxygenating-blood-with-nitrate-rich-vegetables/?

Doctor's Note

Nitrates are one of the reasons I recommend eating dark green leafy vegetables every day. Beets are another good option (not just drinking the juice—see my last video Whole Beets vs. Juice for Improving Athletic Performance).