An antioxidant found in the seeds and leaves of the plant Psoralea corylifolia. Limited research has shown that this ingredient seems to have restorative activity on skin when applied twice daily, and that it may also have a brightening effect on skin. Studies have shown it might also have other helpful benefits for skin.
References for this information:
International Journal of Cosmetic Science, June 2014, issue 3, pages 221-230
Bioscience, Biotechnology, and Biochemistry, Volume 74, Issue 7, 2010, pages 1504-1506
The American Journal of Chinese Medicine, 2010, pages 105-114