Looks scientifically valid from here - decent sample size, repeatable across clinicians, etc - although the success rate is low, it's not insignificant. http://www.the-scientist.com/?articles.view/articleNo/47260/title/Regularly-Whiffing-Essential-Oils-Can-Retrain-Lost-Sense-of-Smell/ Just in case you're interested - hugs - Cady