I have been using Tribulus (Tribulus terrestris) since 1998 for men’s health, particularly for libido, stamina, and endurance. I was treating several rugby league players in 1999 for stress and fatigue. A common issue they had was low libido due to all the training they did as they were elite players who were in First Grade and were representatives. Tribulus greatly benefitted them. They found they had more energy during the game and performed better overall because they felt better.
I often combine Tribulus with Ginkgo, Ginsengs (American, Korean, Siberian), Ashwagandha, Rhodiola, Vitamin B3, and Zinc. If there is muscle tension and stress, I will add Magnesium at 150-200 mg twice daily. Vitamin B3 and Ginkgo are very helpful for improving circulation and work as vasodilators.
Reference: McKay D. Nutrients and botanicals for erectile dysfunction: examining the evidence. Altern Med Rev. 2004 Mar; 9(1): 4-16.