Nutrex Tested is a natural testosterone booster from Nutrex. It was created to help men increase free-testosterone levels, grow more lean muscle and improve both sexual functions and exercise performance.
The product contains two ingredients: Eurycoma longfolia jack extract (also known as tongkat ali) and boron citrate.
According to Nutrex, eurycoma longfolia jack extract (included here as the patented J100) could boost testosterone and lower cortisol (a stress hormone) to improve mood. The brand also says the nutrient may raise the libido.
Boron citrate is also thought to help lower cortisol and raise both free and total testosterone.