http://herbalgram.org/resources/herbclip/issues/issue-713/tongkat-ali-testosterone-levels/

Leisegang K, Finelli R, Sikka SC, S Panner Selvam MK. Eurycoma longifolia (Jack) improves serum total testosterone in men: A systematic review and meta-analysis of clinical trials. Medicina (Kaunas). August 4, 2022;58(8):1047. doi: 10.3390/medicina58081047.

Hypogonadism in males is a condition characterized by reduced libido, erectile dysfunction, infertility, obesity, reduced lean body mass, fatigue, and depression