US FDA advises that a potential risk of rare, but severe liver injury may be associated with kava containing dietary supplements. Ask a healthcare professional before use if you have or have had liver problems, frequently use alcoholic beverages, or are taking any medication. Stop use and see a doctor if you develop symptoms that may signal liver problems, including jaundice (yellowing of the skin or whites of the eyes) and brown urine. Other non-specific symptoms can include nausea, vomiting, light colored stools, unexplained tiredness, weakness, stomach or abdominal pain, and a loss of appetite. Not for persons under 18 years of age or by pregnant or breastfeeding women. Not for use with alcoholic beverages. Excessive use or use with products that cause drowsiness, may impair your ability to operate a vehicle or heavy equipment.