Is Longjack good for men?
Tongkat ali (Eurycoma longifolia), which is also known as longjack, may boost sex drive and improve erections. However, research is limited on its other health benefits. Conclusion. The results of this study suggest that treatment with the proprietary standardized extract of Eurycoma longifolia Jack significantly improves semen volume, sperm concentration, sperm motility and the percentage of morphologically normal sperm in men with idiopathic infertility.