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.
Some human studies have shown increased testosterone associated with Tribulus supplementation, however they are confounded with coingestion of other nutrients and one which used 6g of the root extract of tribulus terrestris by itself for 60 days in infertile men noted a trend to increase testosterone (failed to be statistically significant) reaching 16.3%.