Xyience XTEST Extreme Testosterone is a non-androgen, non-hormonal natural testosterone potentiating formula that helps to promote muscle growth naturally. XTEST comprises the herbs of Phaponticum and Ajuga that can increase body’s protein production at the cellular level and help build muscle tissue. Eurycoma longifolia and Tribulus terrestris act positively on hormonal system, including supporting increase levels of testosterone. XTEST Extreme is a dietary supplement. The components are derived from natural sources.