Hundreds of thousands of words have been written about neem over the past 50 years. One of the best resources (not to mention free!) is the National Institutes of Health library where research from around the world is posted at www.pubmed.com.
Another government resource is “Neem: A Tree for Solving Global Problems,” the book that actually started this company. We’d read about its benefits as a non-toxic pesticide but this research totally opened our eyes to its amazing potential.