Cautions and Warnings: Avoid taking with alcohol or products that cause drowsiness. Consult a health care professional if sleeplessness persists for more than 4 weeks (chronic insomnia). Consult a health care professional prior to use if you are taking medications for seizure, blood pressure, to supress the immune system (immunosuppressive medications), to afffect mental state or increase sedation, steroids or blood thinners. Consult a health care professional if you have cardiovascular, immune, liver or chronic kidney disease, hormonal or seizure disorders, asthma, depression, diabetes, low blood sugar or migraine. Stop use if allergy occurs or if you experience headache, confusion or nausea. Some people may experience drowsiness. Exercise caution if involved in activities requiring mental alertness. Do not drive or use machinery for 5 hours after taking melatonin. Do not use this product if you are pregnant or breastfeeding.