Growth hormone is important during growth and development, playing a role in determining one's stature. It is also beneficial for healthy bones and stimulates collagenous tissue synthesis. Dr. Phillips speculates that growth-hormone stimulated collagen may strengthen tendons that support muscles. He further states that although not applicable for most men, clinically replacing low testosterone and growth hormone levels may be valid. However, in excess these hormones may be drivers of certain cancers. In this clip, Dr. Stuart Phillips discusses how growth hormone promotes collagen synthesis and how this might relate to muscle strength.