The majority of medicines presently in use have their origins in plant sources. Plant-derived compounds contain immunomodulatory properties that make them appropriate for use in drug development. Plant polysaccharides including açaí fruit, ganoderma lucidum and cordyceps sinensis exhibit immunostimulatory or immunomodulatory properties. Flavonoids which include flavonones, isoflavone, xanthones, flavones and flavonols are found in nearly all plants and have a variety of bioactive qualities. Proteins derived from certain herbs are utilized as natural protein supplements for convalescent patients. Additionally, plant-based drugs such as silymarin derived from the seeds of silybum marianum is utilized to treat liver disease, and artemisinin derived from the seeds of artemisia annua is utilized to treat multidrug-resistant malaria. Alkaloids are being repurposed as nitric oxide activators to aid in the prevention of atherosclerosis and obesity. This book is a valuable compilation of topics, ranging from the basic to the most complex advancements in the field of plant based medicines. Those with an interest in this field would find it helpful.