Sex hormones are natural substances found in many plants. Sex hormones are the natural hormone system in the body. They help your body develop sex characteristics (sexual characteristics) like growth, development, and fertility. Sex hormones help to build muscles, develop the ovaries, and produce sperm. For a list of medical companies and some of their ingredients, click on the company name below. Many of the drugs found in drugs are derived from plants, which also contain natural substances, like the hormone hormones. Drugs include medications (a medication is a drug that helps the body work) and other natural and synthetic substances (natural substances that help a body function). Sex hormones are the same as birth control. Natural and synthetic substances include natural plant hormones, synthetic hormones, and steroids. Steroids have been banned by the FDA because of the effects they have on the developing child. Steroids are also banned in other countries due to the dangers of the side effects they have. Steroids can cause the death of an unborn baby in the womb. It can cause a miscarriage. It can also cause cancer. Some birth control pills contain the estrogen and progesterone and other hormones. The hormones are manufactured by pharmaceutical companies. These hormones may also cause birth defects.