Piper Methysticum Leaf/Root/Stem Extract
Kava kava is a crop of the western Pacific that has some analgesic (painkiller) properties. According to Paula's Choice, it can also cause skin irritation. A 2009 safety assessment of the ingredient concluded that "the available data are insufficient to support the safety of these ingredients in cosmetics".
Show me some proof
- International journal of toxicology, 2009 Nov-Dec;28(6 Suppl):175S-88S, Final report on the safety assessment of Piper methysticum leaf/root/stem extract and Piper methysticum root extract.