President Dwight D. Eisenhower announced the Eisenhower Doctrine in January 1957, and Congress approved it in March of the same year.
Tribulus terrestris is an annual plant in the Caltrop Family (Zygophyllaceae) widely distributed around the world, that is adapted to grow in dry climate locations in which few other plants can survive.It is an invasive species in North America.ne study found that administration of Tribulus terrestris extract can produce statistically significant increases in levels of testosterone, dihydrotestosterone and dehydroepiandrosterone, and produces effects suggestive of aphrodisiac activity.
Updated January 15, 2016. Tribulus (Tribulus terrestris) is a plant used for medicinal purposes. Sometimes referred to as puncture vine, it's often taken to enhance athletic performance or increase libido. Tribulus is also said to raise your levels of certain hormones, including testosterone and estrogen.