L-Threonine

Threonine is an essential amino acid. Amino acids are the building blocks the body uses to make proteins. The "essential" amino acids are those that cannot be made by the body and must be obtained from the diet.

People use threonine for conditions such as a muscle control disorder marked by involuntary movements and muscle tightness (spasticity), multiple sclerosis (MS), inherited disorders marked by weakness and stiffness in the legs (familial spastic paraparesis or FSP), and Lou Gehrig's disease (amyotrophic lateral sclerosis or ALS), but there is no good scientific evidence to support these uses.