Hospital Universiti Sains Malaysia telah menjalankan kajian klinikal terhadap 109 individu lelaki berumur 30-55 tahun selama 3 bulan.
Kajian tersebut mendapati terdapat peningkatan ketara melibatkan fungsi fizikal, kecergasan badan dan kualiti sperma serta testosteron.
Kajian: Shaiful Bahari Ismail, Wan Mohd Zahiruddin Wan Mohammad, Annie George, Nik Hazlina Nik Hussai, Zatul Mufiza Musthapa Kamal, and Eckehard Liske, “Randomized Clinical Trial on the Use of PHYSTA Freeze-Dried Water Extract of Eurycoma longifolia for the Improvement of Quality of Life and Sexual Well-Being in Men,” Evidence-Based Complementary and Alternative Medicine, vol. 2012, Article ID 429268, 10 pages, 2012. doi:10.1155/2012/429268.
