There are thousands of Chinese herbs, of which about 300 are commonly used. You will generally receive a mixture of multiple different herbs in a formula that has been tailored to your needs. It is uncommon in Chinese herbology to take a single herb, instead each herb is chosen to work synergistically together in the formula - the sum being greater than the individual parts. Chinese herbs are extremely effective and normally have only mild side effects, however it is very important to tell me about all the medications and supplements you are currently taking so that we can avoid any unwanted interactions with your formula.