ABSTRACT
Since ancient times, medicinal plants have shown immense potential in terms of their immune regulatory functions against viruses, bacteria, fungi, cancer, and inflammation. The belief in the system of folk medicinal practitioners has been passed on from one generation to another generation for many centuries due to their realistic consideration, constant experimentation, and regular testing. In general, the conventional system employs Emblica officinalis, Asparagus racemosa, Tinospora cordifolia, Inula racemosa, Withania somnifera, and different Terminalia species, along with other plants for making tonics and formulations. Currently, conventional medicinal plants are attracting special interest as ideal candidates for one of the major needs of mankind in the present century, i.e., immunity boosters. Furthermore, they have garnered much attention in clinical research as they offer cost-effective solutions for treating major health issues with fewer side effects than those of the allopathic global drug trade. As a result, the use of numerous Rasayana formulations has been boosted to the next level in various geographical areas covering India, China, Japan, Europe, USA, and Africa, and their consumption has reached a new level during the ongoing COVID-19 pandemic. Therefore, the current chapter highlights the potential of conventional medicinal plants including their families, their major bioactive molecules, and their associated therapeutic roles.
