Ashwagandha herb - also known as Indian winter cherry - is a shrub cultivated in India and North America whose roots have been used for thousands of years by Ayurvedic practitioners. The root contains flavonoids and many active ingredients of the withanolide class. Several studies over the past few years have looked into whether this herb has anti-inflammatory, anti-tumor, anti-stress, antioxidant, mind-boosting, immune-enhancing, and rejuvenating properties (see studies at bottom of page). Historically ashwagandha root has also been noted to have sex-enhancing properties. Many people notice a relaxing effect within hours of taking a 500 mg pill.