Testosterone is a sex hormone; It is naturally produced in both men and women but is made at a much higher level in men. Low testosterone is not just about libido or becoming stronger and bigger in the gym. While this can be an effect of treatment, the condition known as Low T is much more in-depth. It is what gives a male the secondary sex characteristics of a man. Testosterone – which can profoundly reduce energy levels – is responsible for stimulating muscle growth, achieving normal erectile and cognitive functions, restore energy levels and maintaining normal bone density.