Aphrodisiac properties of &lt;a href=http://www.cac.cn/tribulus-terrestris-extract.htm&gt;Tribulus Terrestris Extract&lt;/a&gt; Protodioscin in normal and castrated rats. Gauthaman K, Adaikan PG, Prasad RN.&lt;a href=http://www.cac.cn/proanthocyanidi