Hooray for replicable results! I have absolutely nothing against any organic method, garlic, DE or other. But I like to see the science, since so many home remedies are just a waste of money. DE has been shown to affect only some internal parasites, and it slows down but does not eliminate externals. Hens do seem to do very well on it, however, so if you're willing to pay for it (it's expensive) it seems worth using. http://www.ncbi.nlm.nih.gov/pubmed/21673156 I've seen nothing about garlic. What I have seen that might work is high doses of cinnamon oil, which seems to kill some flagellated parasites, but I can't find anything reputable on garlic. http://www.ncbi.nlm.nih.gov/pubmed/12847923