Ashwagandha (Withania somnifera) is an Indian ayurvedic herb that referred to as "Indian ginseng" because of its rejuvenating properties. Ashwagandha is an "adaptogen", which means that it has ability to help the body to manage physiological and psychological function. It has been used for over 3,000 years to relieve stress, increase in energy level, and improve concentration. It is used for improving thinking ability, decreasing pain and swelling (inflammation), and preventing the effects of aging. It is also used to alleviate fertility problems in men and women and also to increase sexual desire. The herb reduces the harmful effects of longterm stress and helps maintain a healthy balance between the nervous system, endocrine glands, and immune system.