Shilajit is considered the root of Ayurvedic medicine , and the most powerful . Taken alone this herb will strengthen the immune system , strengthen cells and muscles, and can be used as an anti-oxidant , anti-stress, anti-allergen , and an anti-asthma . In the practice of Ayurveda, when Shilajit is used with any other Ayurvedic herb, it is considered to actually increase the health effects of both.