Vejayan J, Yahya YA, Said SA, Norhidayah A, Jayarama V, Zamri N, et al. Glycoprotein Isolated from Eurycoma longifolia (Tongkat Ali) is Capable of Boosting Testosterone Levels in Leydig cells: doi.org/10.26538/tjnpr/v5i6.16. TJNPR [Internet]. 2021 Jun. 1 [cited 2025 Apr. 8];5(6):1078-82. Available from: https://tjnpr.org/index.php/home/article/view/624