Limit the use of caffeine-containing supplements, foods or beverages while taking this product because too much caffeine may cause nervousness, irritability, sleeplessness & occasionally, rapid heart beat. This product contains a significantly potent xanthine (i.e. caffeine & caffeine-like stimulants) mixture of about 200 mg per serving. Consult your physician before use if you are taking caffeine-containing medications or if you are sensitive to stimulants. Not for use by individuals under the age of 18 years. Do not use if pregnant or nursing. Consult a physician or licensed qualified health-care professional before using this product if you have, or have a family history of prostate cancer, prostate enlargement, heart disease, low "good" cholesterol (HDL), or if you are using any other dietary supplement, prescription drug, or over-the-counter drug. Do not exceed recommended serving. Exceeding recommended serving may cause serious adverse health effects. Possible side effects include acne, hair loss, hair growth on the face (in women), aggressiveness, irritability & increased levels of estrogen. Discontinue use & call a physician or licensed qualified health-care professional immediately if you experience rapid heartbeat, dizziness, blurred vision or other similar symptoms. Keep out of reach of children. Use only as directed.