Rasayana herbs are an incredibly important part of Ayurvedic medicine. In Ayurveda, medicinal plants are divided into 8 different categories - one of these being the rasayana tantra. The word literally means the path (ayana) by which the primordia plasma (rasa) travels. Ayurveda states that the primary waters of the body, or the rasa-dhatu, have a potent effect on the body's other dhatus, or tissues. This means that rasayanas would, by default, enhance the health of all tissues in the body. Rasayana herbs can generally be used over the long-term without the development of side effects. All of them provide impressive improvements in the areas of enhancing vitality, improving longevity, and warding off disease. Here are some of the most common and important rasayana herbs that you can find.