Testosterone Mega-Boost Red from Irwin Naturals is designed to support improved performance for men of all ages. Testosterone is the male sex hormone that influences vitality, libido and muscle strength. Testosterone Mega-Boost Red features LJ100(R) Longjack tongkat ali extract to help support healthy testosterone levels as you age. This formula includes L-citrulline which the body uses to boost nitric oxide and promote optimal blood flow throughout the body. With BioPerine for enhanced absorption.