Consult your healthcare professional prior to use if you have or suspect a medical condition, including cardiovascular, kidney or liver disease, high blood pressure, diabetes or cold sores, are taking prescription drugs, or have allergies to arginine, corn, gluten, or citrus fruit. Do not use if you are pregnant or lactating. Not intended for use by individuals under the age of 18 years. Each serving contains as much caffeine as about 2 cups of coffee. Too much caffeine may cause nervousness, irritability, sleeplessness, and occasionally, rapid heartbeat. Do not exceed the recommended intake. Drink a minimum of 64 ounces of water per day while using this product.