What do the experts say about HGH
The table below represents the results of a study on the effects of growth hormone administration upon 202 patients of ages 39-74. (L. Casserly, M.D., P.H.D. Medical College of Wisconsin)
Patients reported improvement in the following areas:

In an article that appeared in the 1990 New England Journal of Medicine, Dr. Daniel Rudman and his colleagues at the University of Wisconsin released the results of their treatment of 12 men aged 61 to 80 with intramuscular growth hormone. After 6 months, these 12 men had lost 14% of their body fat and gained an average of 8.8% muscle mass. Their bone density increased and their skin became thicker and firmer. Appearance of wrinkles disappeared and sexual performance was improved in several of the subjects. Dr. Rudman concluded that, "The overall deterioration of the body that comes with growing old is not inevitable. These injections appear able to reverse 10 years of aging with one year of treatment."
A Physicians Guide To Natural Health Products That Work By James Howenstine MD, page 233

In a 1990 study reported in the New England Journal of Medicine involving 21 men, 61-81 years old, Dr. Rudman found that after a six-month period of HGH injections, lean body mass and fat tissue changes were equivalent in magnitude to the changes incurred during 10-20 years of aging. In other words, the test subjects demonstrated a reversal in the aging process, appearing younger, sleeker, and stronger and benefiting from an increase in muscle mass and a loss in body fat.  Lung capacity and heart, immune, and kidney function all improved with HGH.
Alternative Medicine by Burton Goldberg, page 377

A surprising number of studies show that excess serum insulin (hyperinsulinemia) is a major health problem (Despres et al. 1996; Chu et al. 2001; Thakur et al. 2001). For people trying to reduce body fat, excess insulin suppresses the release of growth hormone in addition to preventing fat from being released from cells.
Disease Prevention And Treatment by Life Extension Foundation, page 393

Human growth hormone may prove to be another valuable weapon in your arsenal of brain longevity medications. Several of my patients report that it has helped them to feel better, to lose weight, and to think more clearly. Synthetic HGH is, however, considerably more expensive than the other pharmaceutical drugs that help rejuvenate the body and brain.
Brain Longevity by Dharma Singh Khalsa M.D. with Cameron Stauth, page 414

Considerable research has been done on the effects of HGH over the past decade. In studies on middle aged and elderly people, HGH supplementation has increased muscle mass, skin thickness, and bone mass, while decreasing body fat.
Disease Prevention And Treatment by Life Extension Foundation, page 539

For people over 40, human growth hormone therapy may be indicated. HGH raises IGF-1 levels leading to improved insulin sensitivity, loss of body fat, and increased lean body mass. HGH therapy is administered and monitored by an anti-aging specialist.
Disease Prevention And Treatment by Life Extension Foundation, page 1091

Obesity is associated with decreased human growth hormone levels. Decreased levels of growth hormone are associated with obesity and corticosteroid use. Therapies that boost growth hormone can help facilitate weight loss. The cost of human growth hormone injections is cost-prohibitive for most people.
Disease Prevention And Treatment by Life Extension Foundation, page 1152

Rudman gathered a group of 21 men together. To half of them he gave a synthetic version of growth hormone three times a week. To the other half he gave nothing. He performed monthly examinations to note the manifestations of aging in all the men. The men treated with hormones recuperated 10% of their muscle, the skin increased its thickness by 9% and they lost 14% of their body fat. The livers and spleens of these men recovered mass. Some of the men felt mild pain in their hands due to an increase of muscle mass and the pressure it created on the joints. But in general, almost all reported noticeable improvements, compared to the group that received no hormones.
Health In The 21st Century by Fransisco Contreras MD, page 235

In 1987, a team of scientists at the University of New Mexico School of Medicine showed that what was true for children was also true for a group of normal, healthy adults—in five men and three women aged twenty-two to thirty-three, treatment with HGH trimmed body fat by 1.5 percent and increased muscle mass by an average of three pounds.
Longevity by Kathy Keeton, page 268