Arch Pharm Res. 2001 Oct; 24(5):437-40. Effects of eurycoma longifolia jack on laevator ani muscle in both uncastrated and testosterone-stimulated castrated intact male rats. Ang HH, Cheang HS.

Bioorg Med Chem. 2004 Feb 1; 12(3):537-44. Cytotoxic and antimalarial constituents from the roots of Eurycoma longifolia. Kuo PC, Damu AG, Lee KH, Wu TS.

Chem Pharm Bull (Tokyo). 2003 Nov; 51(11):1301-3. Eurycomaoside: a new quassinoid-type glycoside from the roots of Eurycoma longifolia. Bedir E, Abou-Gazar H, Ngwendson JN, Khan IA.

Exp Anim. 2000 Jan; 49(1):35-8. Effects of eurycoma longifolia Jack (Tongkat Ali) on the initiation of sexual performance of inexperienced castrated male rats. Ang HH, Cheang HS, Yusof AP.

Fundam Clin Pharmacol. 2002 Dec; 16(6):479-83. Effect of eurycoma longifolia Jack on orientation activities in middle-aged male rats. Ang HH, Lee KL.

J Nat Prod. 2003 Oct; 66(10):1324-7. Cytotoxic and antimalarial beta-carboline alkaloids from the roots of Eurycoma longifolia. Kuo PC, Shi LS, Damu AG, Su CR, Huang CH, Ke CH, Wu JB, Lin AJ, Bastow KF, Lee KH, Wu TS.

Fundam Clin Pharmacol.  2001 Aug;15(4):265-8 Aphrodisiac evaluation in non-copulator male rats after chronic administration of Eurycoma longifolia Jack. Ang HH, Ngai TH.

J Ethnopharmacol. 2002 Sep; 82(1):55-8. In vitro anti-tumor promoting and anti-parasitic activities of the quassinoids from Eurycoma longifolia, a medicinal plant in Southeast Asia. Jiwajinda S, Santisopasri V, Murakami A, Sugiyama H, Gasquet M, Riad E, Balansard G, Ohigashi H.

J Ethnopharmacol. 1995 Dec 15; 49(3):171-5 Effect of 7-day daily replacement of culture medium containing Eurycoma longifolia Jack constituents on the Malaysian Plasmodium falciparum isolates. Ang HH, Chan KL, Mak JW.

J Nat Prod. 1991 Sep-Oct; 54(5):1360-7.Cytotoxic and antimalarial constituents of the roots of Eurycoma longifolia. Kardono LB, Angerhofer CK Tsauri S, Padmawinata K, Pezzuto JM, Kinghorn AD.

J Basic Clin Physiol Pharmacol. 2003;14(3):301-8. Eurycoma longifolia Jack enhances sexual motivation in middle-aged male mice. Ang HH, Lee KL, Kiyoshi M.

Jpn J Pharmacol. 1999 Apr; 79(4):497-500. Studies on the anxiolytic activity of eurycoma longifolia Jack roots in mice. Ang HH, Cheang HS.

Phytother Res 2001 Aug; 15(5):435-6 Evaluation of the potency activity of aphrodisiac in Eurycoma longifolia Jack. Ang HH, Ikeda S, Gan EK

Planta Med. 1995 APR; 61(2):177-8 In vitro antimalarial activity of quassinoids from Eurycoma longifolia against Malaysian chloroquine-resistant Plasmodium falciparum isolates. Ang HH, Chan KL, Mak JW.

Thai J Phytopharmacy. 1998 Dec; 5(2):14-27. Toxicological and antimalarial activity of eurycomalactone and eurycoma longifolia Jack extracts in mice. Satayavivad J, Soonthornchareonnon N, Somanabandhu A, Thebtaranonth Y.
 A list of detailed niacin studies can be found at

A list of detailed studies regarding testosterone can be found at–studies.html