The search for bioactive compounds has been rewarded by plants, as they are the richest source of these secondary metabolites. Of late, natural product chemists have also started exploring the same family but different species in this pursuit. This has yielded plethora of novel compounds, with interestingly increased in biological activities. This Book deals with various aspects of Bioactive Natural Products such as Isolation of Bakuchiol a meroterpene possessing insect juvenile hormone activity and its conversion into a more potent semi synthetic derivative, confirmation of biosynthetic route of Precocene-I by feeding different precursors and studying their step wise degradation. Studying the effect of Ecdysterone on larval maturation and economic parameters of silkworm, Bombyx mori L. This book can be very useful for research students undertaking Master's and Ph. D. courses.