You might try contacting the makers of Citricidal brand of GSE (grapefruit seed extract) for lab. result info. Here is one quotation from the FDA that I was able to find on a *commercial* site that sells GSE: Source: http://www.nutriteam.com/parasites.htm#FDA "Dr Louis Parish, M.D., as investigator for the Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, reported that (grapefruit seed extract) "...is as effective as any other amoebicide now available, perhaps more effective..." and, "It does not cause side effects." Nearly 200 patients were treated for Entamoeba histolytica and Giardia lamblia by Dr Parish and his associates over a two month period. Dr. Parish went on to say, "...it (GSE) gives symptomatic relief more than any other treatment." The site has other info. on GSE and its uses, including usages in pets, if you want to look at it. I'd recommend calling the company for lab. results, though; it does seem to indicate on the Web site that they are available. - Ela Ela Heyn Harborside Mail Stop 3024 201-860-3336 [log in to unmask] [Posted in FML issue 2839]