The benefits of human growth hormone (hGH) and testosterone supplementation for deficient adults are clearly documented in the medical literature from Harvard University, Mayo Clinic, and many other prestigious institutions. This information is available to you on the links provided below. The benefits of human growth hormone (hGH) and testosterone include the following: a decrease in body fat, an increase in energy, including sexual energy, an increase in lean muscle, thickening of the skin with decreased wrinkling, improvement in the cholesterol profile, an increase in bone density, enhanced feeling of well being, improvement in aerobic capacity, enhanced immune function and a decrease in the frequency of illness.