title: Final report on the safety assessment of Piper methysticum leaf/root/stem extract and Piper methysticum root extract.
abstract: Piper methysticum leaf/root/stem extract is the cosmetic ingredient name for a material derived from the leaves, roots, and stems of the Piper methysticum G. Forster plant, commonly known as kava kava. This and other kava-derived ingredients are used as skin-conditioning agents at concentrations from 0.0001% to 0.1%. The Food and Drug Administration issued a consumer advisory in 2002 expressing concern about liver damage in individuals who have ingested kava products. The available oral toxicity data support the concern about liver damage on ingestion but do not resolve the question, for example, whether these ingredients would be substantially absorbed through the skin. Other data needs are described, including toxicology data for yangonin, methysticin, and kavain, which may be present in kava-derived ingredients. Accordingly, the available data are insufficient to support the safety of these ingredients in cosmetics.
authors: Cosmetic Ingredient Review, 1101 17th Street, NW, Suite 412, Washington, DC 20036, USA. cirinfo@cir-safety.org
authors: Valerie
authors: V
authors: Robinson
authors: Wilma F
authors: WF
authors: Bergfeld
authors: Donald V
authors: DV
authors: Belsito
authors: Curtis D
authors: CD
authors: Klaassen
authors: James G
authors: JG
authors: Marks
authors: Ronald C
authors: RC
authors: Shank
authors: Thomas J
authors: TJ
authors: Slaga
authors: Paul W
authors: PW
authors: Snyder
authors: F Alan
authors: FA
authors: Andersen
mesh_terms: D000279:Administration, Cutaneous; D000284:Administration, Oral; D000818:Animals; D056486:Chemical and Drug Induced Liver Injury / Q000209:etiology; D003358:Cosmetics / Q000009:adverse effects / Q000737:chemistry*; D006801:Humans; D020901:Kava / Q000737:chemistry*; D010936:Plant Extracts / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000633:toxicity*; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D011714:Pyrans / Q000009:adverse effects; D011753:Pyrones / Q000009:adverse effects; D017592:Skin Care / Q000009:adverse effects*; D018675:Toxicity Tests
chemical_list: D003358:Cosmetics; D010936:Plant Extracts; D011714:Pyrans; D011753:Pyrones; C076881:methysticin; C110481:yangonin; C011889:kavain