In the last 15 years, molecular investigations of the growth-hormone–IGF1 axis and the availability of new, effective endocrine therapies have renewed interest in disorders characterized by GHI.

Human growth hormone (hGH) is linked to muscle mass, weight loss, and increased athletic performance. You produce hGH naturally, but you can also get injections of recombinant growth hormone (rhGH).

Bioidentical hormone replacement therapy (BHRT) treats hormonal imbalances in the body using lab-made chemicals that are identical to human hormones in their molecular structure. The term ...