Scientifically Engineered Testosterone Receptor Amplifier. Test Subjects Significantly Enhanced Testosterone Receptor Concentration in Just 21 Days. Featuring a Calculated Dose of University Studied Carnitine. Scientifically Engineered Testosterone Receptor Amplifier: To drive this highly advanced HexaTest formula MuscleTech researches used a calculated dose of University-tested Carnitine, which was scientifically shown to be effective at increasing testosterone (androgen) receptor concentration in a study conducted at the prestigious University of Connecticut. Test Subjects Significantly Enhanced Testosterone Receptor Concentration in Just 21 Days: In a journal-published human study on Carnitine supplementation, the key compound in HexaTest, subjects dramatically increased pre-workout testosterone (androgen) receptor concentration significantly more than when using a placebo! This study, published in the prestigious journal of Medicine & Science in Sports & Exercise, used a randomized, double-blind, placebo-controlled cross-over design protocol to test how 10 previously trained male subjects reacted to the same key compound found in the HexaTest formula. The study results showed this key compound can in fact amplify your body's testosterone (androgen), receptor concentration in just 21 days! Researchers in this study theorized that this led to greater cellular uptake of testosterone. Featuring a Calculated Dose of University Studied Carnitine: Leave it to Team MuscleTech to push the envelope of supplement innovation with another formula driven by a key compound backed by scientific research. Train hard and get on HexaTest Hardcore Pro Series today! HexaTest Blend: L-carnitine fumarate, Aspartic acid (supplying d-aspartic acid), Fenugreek (as Trigonella foenum-graecum)(seed), Massularia acuminate (stem), Sacred lotus (as Nelumbo nucifera) (seed and leaf).