As an essential amino acid, Threonine (or L-Threonine) must be obtained from the diet. Threonine (L-Threonine) assists natural growth and protein balance in the body. Threonine (L-Threonine) is used in several of the body's systems including cardiovascular, liver, central nervous, and immune. Threonine (L-Threonine) is also used by the body to create other substances that are necessary for the formation of connective tissue and muscle tissue. Threonine (L-Threonine) is beneficial for building strong teeth and bones, as well as for healing injuries.

Threonine is an essential amino acid, found naturally as L-Threonine, required for normal digestive and intestinal tract function. As a transfer agent and neurotransmitter, it is thought useful in helping the body to prevent an accumulation of fat in the liver. Severe deficiencies of threonine cause neurologic dysfunction of the musculature and lameness, as documented in scientific experiments.Threonine is a naturally occurring "immunostimulant" which nutritionally promotes the growth of the thymus (in general the stronger the thymus, the better one's health), while also complementing the body's promotion of cell immune defense function.

Threonine, in this capacity, works naturally in conjunction with Lysine. Threonine has been identified as part of a naturally occurring antiinflammatory complex which may be related to the problems associated with joint discomfort, although this remains unproven.Perhaps of importance as well is the fact that this amino acid has been reportedly successful in the nutritional care of some genetic spasticity disorders, but more research is needed before any true relationships can be defined. Threonine levels have also been noted to be low in chronically depressed persons at Princeton's Brain-Bio Institute, and subsequent supplementation was found for some of these to lead to the control of their depression.