TNT Test Your Limits is a testosterone supplement. Muscle gains are largely governed by testosterone a primary male sex hormone (it also plays a part in female physiology) that has an anabolic effect. To achieve maximum progress from your training, its important that your bodys testosterone levels are in check. Test Your Limits by TNT is a concentrated, highly effectual male support product thats 100% natural. It contains scientifically researched, trusted ingredients in potent doses to deliver results. The Testosterone Enhancement Amplifier features d-aspartic acid an amino acid which helps to regulate testosterone synthesis.