Glycine is a non-essential amino acid, meaning that the body can synthesize it on its own. However, it is also obtained from dietary sources and plays several important roles in the body.

Sarcopenia is the muscle loss that comes with aging. This kind of muscle atrophy can be accelerated by lack of movement or mobility.Sarcopenia typically starts in your 30's, when people start to lose between 3-5% of muscle per decade.