41. Phytochemical extracts of the leaves and fruit contain acetogenins, including the neurotoxin, annonacin.42. Carotenoids are the best future for phytochemicals . 43. Cooked lettuce gives you a concentrated shot of vitamin A and phytochemicals , which fight cancer. 44. High in phytochemicals and vitamin A, well-cooked lettuce is also a digestive aid. 45. It contains a phytochemical that can alter the effect of some medications, including cold medicine. 46. Those who follow this will be consuming a wide spectrum of phytochemicals as well as nutrients. 47. However, with the exception of dietary fiber, phytochemicals are not established as essential nutrients. 48. The classification below is based upon a hierarchical structure based on cladistic analyses of phytochemical data. 49. The scientific literature is diverse, with studies of phytochemicals from bark, leaves and fruit. 50. The essential oils of the New Zealand species have been the subject of a phytochemical analysis.