Hyperforin a constituent of St Johnʼs wort (Hypericum perforatum L.) extract induces apoptosis by triggering activation of caspases and with hypericin synergistically exerts cytotoxicity towards human malignant cell lines - Hostanska, K; Reichling, J; Bommer, S; Weber, M; Saller, R (Eur J Pharm Biopharm, 2003)