Eurycoma longifolia Jack, Long Jack , Tonkat Ali
Long Jack or Tonkat Ali (Eurycoma longifolia Jack) is a Malaysian herb that is considered to be a powerful male aphrodisiac.
Three studies showed that Eurycoma longifolia Jack increase male virility and sexual prowess in sexually sluggish old male rats.
Ang, H.H. and H.S. Cheang, Effects of Eurycoma longifolia jack on laevator ani muscle in both uncastrated and testosterone-stimulated castrated intact male rats. Arch Pharm Res, 2001. 24(5): p. 437-40.
Ang, H.H., H.S. Cheang, and A.P. Yusof, Effects of Eurycoma longifolia Jack (Tongkat Ali) on the initiation of sexual performance of inexperienced castrated male rats. Exp Anim, 2000. 49(1): p. 35-8.
Ang, H.H., K.L. Lee, and M. Kiyoshi, Sexual arousal in sexually sluggish old male rats after oral administration of Eurycoma longifolia Jack. J Basic Clin Physiol Pharmacol, 2004. 15(3-4): p. 303-9.
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