Botanical medicine or herbal medicine has been used for thousands of years. Hippocrates used herbs and food to heal his patients. All herbs contain phytochemicals that have healing properties for many different diseases. Milk thistle is a great herb for the liver and has been used to lower elevated liver enzymes. The herb echinacea can decrease the frequency of colds and the flu and prevent infections. Reishi is a Chinese herb for the immune system and is prescribed for immune support and for cancer.