Coffee is an excellent source of several antioxidants, including hydro-cinnamic acids and polyphenols. These compounds may play a role in preventing several chronic and acute conditions. Coffee plays a role in reducing the risk of several types of cancer. Coffee powder is meant to be used as an ingredient to make a brewed beverage. Coffee contains caffeine, which is a stimulant that can increase your heart rate, blood pressure, and cause a temporary increase in alertness.