26 mins read

L-threonine is an essential amino acid in humans, meaning that it can not be manufactured in the body. The chemical formula for L-threonine is HO2CCH( NH2) CH( OH) CH3, and its DNA codons are ACA, ACC, ACG and ACU. L-threonine is among the 20 typical proteinogenic amino acids for people, which are used to construct proteins. It is likewise a polar amino acid and one of the two proteinogenic amino acids that contain alcohol groups. The American nutritional expert William Cumming Rose found threonine throughout the 1930s, making it the last of the common proteinogenic amino acids to be discovered.

Threonine can be prepared in the laboratory by responding mercury acetate with crotonic acid. This treatment yields a racemic mix of threonine, suggesting that it produces both D-threonine and L-threonine. However, just L-threonine is biologically active for human beings. Lots of plants and some bacteria can manufacture L-threonine by utilizing homoserine and alpha-aspartyl-semialdehyde to produce aspartic acid. Aspartic acid can then be reduced to yield L-threonine. [2]

System of action

L-Threonine is a precursor to the amino acids glycine and serine. It acts as a lipotropic in controlling fat accumulation in the liver. Might assist combat mental disorder and may be very helpful in indigestion and intestinal malfunctions. Also, threonine avoids extreme liver fat. Nutrients are quicker absorbed when threonine exists. [3]


L-Threonine promotes regular growth by helping to maintain the correct protein balance in the body. L-Threonine likewise supports cardiovascular, liver, main anxious, and body immune system function. Threonine is required to create glycine and serine, 2 amino acids that are required for the production of collagen, elastin, and muscle tissue. Threonine assists keep connective tissues and muscles throughout the body strong and elastic, consisting of the heart, where it is found in substantial amounts. It likewise assists construct strong bones and tooth enamel, and may speed injury healing or healing from injury. Threonine integrates with the amino acids aspartic acid and methionine to help the liver with lipotropic function, or the digestion of fats and fatty acids. Without enough threonine in the body, fats might build up in the liver and eventually trigger liver failure. Threonine supports the immune system by assisting in the production of antibodies. [4]

Food Sources

1. Turkey

A swelling of protein-rich meat such as turkey is understood to properly supplement the body with threonine. In fact, it is extensively credited to be one of the wealthiest sources of threonine by the U.S Department of Health and Agriculture. An 85-gram serving of turkey is 1090 milligrams of threonine. This serving itself can supply you with 61 % of your threonine needs if you happen to be a male or 72 % your intake needs if you take place to be a woman.

% of Threonine in 100 gms: 100 %– 104 %.

2. Egg White Powder

With zero hydrogenated fats or cholesterol, egg whites powder can be an exceptional source of threonine. One can use egg white powder whilst baking as a two-tablespoon serving is understood to include 513 milligrams of threonine. This is 30 % of a male’s everyday threonine requirements and 34 % of what a woman requires on a daily basis.

3. Soy Products

Vegans have yet another factor to rejoice over soy products as soy is understood to be a rich source of threonine. A cup of raw soybeans is understood to consist of 3,000 milligrams of threonine. This is far above the daily requirement of both males and females. Soy flour, soy milk, tofu and soy nuggets can likewise be added to our diet to supplement our threonine needs.

% of Threonine in 100 gms: 22 %.

4. Lean Beef

Lean beef is understood to be an abundant source of threonine mainly depending upon how it is prepared. The top loin of beef filet without bones when grilled is understood to contain 2142 milligrams of threonine that makes beef a protein source par excellence for guys, females and kids.

% of Threonine in 100 gms: 134 %.

5. Chicken Breast

While chicken is commonplace meat in our daily diets, we are hardly mindful that it is abundant in threonine. One entire prepared chicken is understood to contain 137 % of threonine RDI. It likewise consists of other essential amino acids that are advantageous for males, females and kids.

% of Threonine in 100 gms: 112 %.

6. Parmesan Cheese

Parmesan is by far among the world’s most popular varieties of cheese. The next time you have a takeaway pizza meal; don’t feel as guilty as what you are consuming is not all junk. Parmesan is known to have 125 % of the threonine RDI.

% of Threonine in 100 gms: 125 %.

7. Pork

Be it bacon, salami or pork chops, pork is an abundant source of threonine that is vital for development and organ functions. Pork is understood to contain 132 % of the threonine RDI. This is understood to be among the best Threonine abundant foods and can be obtained by using Pork in a number of methods.

% of Threonine in 100 gms: 132 %.

8. Saltwater Fish

Here is another factor to take your household out to a seafood restaurant as saltwater fish that is abundant in Omega 3 fatty acids is also rich sources of the amino acid threonine. Salmon is known to consist of 122 % of the threonine RDI. It is likewise abundant in many healthy nutrients to promote healthy wellness.

% of Threonine in 100 gms: 122 %.

9. White Beans

White beans are a boon for vegans looking to supplement their threonine needs. Apart from its numerous health benefits, white beans are understood to contain 39 % of the threonine RDI. If you don’t consume meat or eggs, white beans are a must on your plate.

% of Threonine in 100 gms: 39 %.

Now that you have seen this list of threonine abundant foods, it’s time to include them in your diet. Threonine is of utmost value to the body and like other amino acids is a crucial element. An intricate system such as the human body needs a well-balanced diet to get in all the essential nutrients. By including them to your everyday meal strategy, not only will you able to deal with Threonine deficiencies, but likewise prevent numerous harmful disorders. [5]


In biochemistry, the term amino acid is often utilized to refer particularly to alpha amino acids– those amino acids in which the amino and carboxylate groups are attached to the very same carbon, the so-called α– carbon (alpha carbon). The basic structure of these alpha amino acids is:.






where R represents a side chain specific to each amino acid.

Many amino acids take place in two possible optical isomers, called D and L. The L amino acids represent the huge majority of amino acids discovered in proteins. They are called proteinogenic amino acids. As the name “proteinogenic” (literally, protein building) recommends, these amino acid are encoded by the standard hereditary code and take part in the process of protein synthesis.

With 2 chiral centers, threonine can exist in 4 possible stereoisomers, or two possible diastereomers (not mirror images) of L-threonine. Nevertheless, the name L-threonine is used for one single enantiomer, (2S, 3R) -2- amino-3-hydroxybutanoic acid. This is the only form utilized in mammalian proteins. The second diastereomer (TWO, THREE), which is rarely present in nature, is called L-allo-threonine. Stereoisomers are molecules whose atomic connection is the same but whose atomic arrangement in space is different. Enantiomers are stereoisomers that are nonsuperposable complete mirror images of each other, much as one’s left and right hands are “the same” however opposite.

Threonine has the chemical formula CH3-CH( OH)- CH( NH2)- COOH, or more generally, C4H9NO3.

Threonine, like serine, has a brief group ended with a hydroxyl group. The hydroxyl group attached makes it a polar amino acid. Its hydrogen is simple to get rid of, so threonine and serine typically serve as hydrogen donors in enzymes. Nevertheless, while serine has a reputation as being associated with catalytic functions in enzymes, such as in trypsin and chymotrypsin, threonine’s role is this regard is not settled. Both threonine and serine are very hydrophilic, for that reason the outer regions of soluble proteins tend to be abundant with them.

The threonine residue (part) is susceptible to numerous posttranslational adjustments. The hydroxy side chain can go through O-linked glycosylation (addition of saccharides). In addition, threonine residues undergo phosphorylation (addition of phosphate) through the action of a threonine kinase. In its phosphorylated kind, it can be described as phosphothreonine. [6]


As a necessary amino acid, threonine is not manufactured in human beings, and needs to be present in proteins in the diet plan. Adult human beings need about 20 mg/kg body weight/day. In plants and microorganisms, threonine is synthesized from aspartic acid through α-aspartyl-semialdehyde and homoserine. Homoserine undergoes O-phosphorylation; this phosphate ester undergoes hydrolysis concomitant with relocation of the OH group. Enzymes associated with a normal biosynthesis of threonine include:.

  • aspartokinase
  • β-aspartate semialdehyde dehydrogenase
  • homoserine dehydrogenase
  • homoserine kinase
  • threonine synthase

Metabolic process

Threonine is metabolized in a minimum of 3 methods:.

In numerous animals it is transformed to pyruvate through threonine dehydrogenase. An intermediate in this pathway can undergo thiolysis with CoA to produce acetyl-CoA and glycine.

In human beings the gene for threonine dehydrogenase is a non-active pseudogene, so threonine is converted to α-ketobutyrate. The system of the first step is comparable to that catalyzed by serine dehydratase, and the serine and threonine dehydratase responses are most likely catalyzed by the very same enzyme.

In many organisms it is O-phosphorylated by a kinase preparatory to further metabolic process. This is particularly essential in bacteria as part of the biosynthesis of cobalamin (Vitamin B12), as the item is transformed to (R) -1- aminopropan-2-ol for incorporation into the vitamin’s sidechain.

Threonine is utilized to synthesize glycine throughout the endogenous production of L-carnitine in the brain and liver of rats. [7]


1. Supports Digestive Health

Threonine protects the digestive tract by producing a mucous gel layer that covers it and serves as a barrier to damaging gastrointestinal enzymes. This crucial amino acid likewise supports healthy gut function by promoting the protective results of the gut mucous barrier.

According to research released in Frontiers in Bioscience, a big proportion of dietary threonine is utilized for intestinal-mucosal protein synthesis. For this reason, consuming Thr foods may help to improve gut health under physiological and pathological conditions in both humans and animals.

2. Increases Immune System

We require enough Thr to support appropriate immune function. The thymus gland utilizes the important amino acid to make T-cells, or T lymphocytes, that work to eliminate off infections inside the body.

Research study released in Cold Spring Harbor Point of views in Biology mentions that “serine/threonine kinases control the epigenetic, transcriptional and metabolic programs that figure out T-cell function.” Scientists describe that at a basic level, serine and threonine kinases work as a series of on/off switches that trigger antigen and cytokine receptors that make up the body immune system.

3. Might Improve Muscle Contractions

Although more research study is needed to further understand its role, there is some proof that Thr might benefit symptoms of ALS, aka Lou Gehrig’s disease. Thr amino acid works to increase glycine levels in the central nervous system.

Glycine is utilized to deal with spasticity, which is why L-threonine has actually been examined for its capability to enhance spasticity, or contracting muscles, in ALS patients.

In an evaluation carried out in Australia, researchers discovered that a double-blind, placebo-controlled research study of oral L-threonine to deal with back spasticity indicates a modest antispasmodic effect. Nevertheless, studies including ALS patients reveal no enhancements with L-thr treatment.

These combined reviews recommend that utilizing L-threonine supplements may help in reducing contraction however may not be effective for ALS signs.

4. Supports Muscle and Bone Strength

Did you understand that collagen and elastin proteins require threonine for appropriate production? You might already understand that collagen is the most abundant protein in the body, and it’s discovered in our muscles, bones, skin, capillary, tendons and digestion system.

Due to the fact that Thr enables the production of collagen, it plays an essential function in the health of your bones and muscles.

Research carried out Texas A&M University shows that glycine from threonine, proline and hydroxyproline contributes to 57 percent of total amino acids in collagen. Thr amino acid is a precursor to glycine, which is also used throughout the biosynthesis of creatine, supplying muscles with a direct source of fuel to fix damage.

Threonine likewise enables proper elastin function. Elastin is a protein that’s found in connective tissue and lets the skin, tendons and ligaments resume shape after extending or contracting.

5. Helps Prevent Fatty Liver

Thr amino acid prevents fat accumulation in the liver. It does this by controling fat metabolic process and assisting in lipotropic function.

Liptropic compounds work to break down fat during metabolism, and without the amino acids threonine, methionine and aspartic acid, this wouldn’t be possible. Threonine deficiency can cause fatty liver and even liver failure.

An animal study released in the American Journal of Physiology found that Thr-deficient diets increase mitochondrial uncoupling in the liver. This means that diets doing not have quality protein foods that supply vital amino acids can result in cell malfunction and the buildup of fats in the liver.

6. Might Alleviate Anxiety and Mild Depression

Research studies reveals that alternations in serum levels of amino acids, consisting of serine and glycine, which require Thr for production, are connected to significant depression. Scientists in Belgium found that changes in levels of threonine, aspartate, asparagine and serine may anticipate a client’s reaction to treatment with antidepressants by modulating amino acid levels in the body.

Since Thr is a precursor to glycine, which assists calm nerves and support cognitive health, it’s frequently utilized as a supplement to eliminate indications of stress and anxiety and anxiety. Glycine is likewise understood for its ability to help enhance sleep, psychological efficiency, state of mind and memory.

7. Accelerates Injury Recovery

Threonine is needed for the proper production of collagen, which is required for connective tissue formation and wound healing.

Research study shows that after experiencing burns or injury, people have greater urinary spill of threonine. This suggests that the amino acid is metabolized from body tissues after an injury.

Increasing your consumption of Thr through amino acid T foods or supplements may help speed healing of wounds, burns and other types of trauma.

Shortage Symptoms and Triggers

Threonine shortage is unusual, as the majority of people get enough of the amino acid in the foods they eat. Nevertheless, people with an out of balance diet plan, vegans and vegetarians, might not consume adequate threonine foods, which can trigger low levels of the amino acid.

Thr shortage may trigger the following symptoms:.

  • digestive issues
  • irritation or psychological agitation
  • confusion
  • increased liver fat
  • poor nutrient absorption [8]

L-Threonine Supplements

The usual dosage is in between 100-500 mg each day. Up to 3 500 mg capsules can be taken in one day if needed. Magnesium, vitamin B6 and niacin are likewise required together with the threonine in order to synthesize non-essential amino acids consisting of serine and glycine. [9]

Side Effects

When taken by mouth: Threonine is LIKELY SAFE when utilized in food quantities. It’s been proposed that individuals require to get about 0.5 to 1 gram of threonine from their diet plan each day. This amount is thought about to be safe. Threonine is potentially SAFE when utilized as a medicine. Doses of as much as 4 grams of threonine daily have actually been used securely for as much as 12 months. Some individuals experience minor adverse effects such as indigestion, headache, queasiness, and skin rash.

Unique Preventative Measures and Cautions

When taken by mouth: Threonine is LIKELY SAFE when utilized in food quantities. It’s been proposed that people require to get about 0.5 to 1 gram of threonine from their diet plan per day. This amount is thought about to be safe. Threonine is POSSIBLY SAFE when utilized as a medication. Dosages of up to 4 grams of threonine daily have actually been utilized safely for up to 12 months. Some people experience small adverse effects such as stomach upset, headache, nausea, and skin rash. Pregnancy and breast-feeding: There isn’t sufficient trusted info to understand if threonine is safe to use when pregnant or breast-feeding. Remain on the safe side and prevent usage.

Amyotrophic lateral sclerosis (Lou Gehrig’s illness): There is some issue that threonine might reduce lung function in patients with ALS. In one research study, ALS clients taking 1 gram of threonine 4 times each day for 6 months had significantly lowered lung function compared to clients who did not get threonine. More proof is required to determine if threonine was really at fault. [10]


Medications utilized for Alzheimer’s disease (NMDA antagonists) Interaction Rating: Significant Do not take this combination.

There is some concern that threonine may decrease how well a medication utilized for Alzheimer’s illness works. This medication is called memantine (Namenda). [11]

The Bottom Line

Amino acids are essential to your total health and wellness. Without them, resistance decreases, digestive problems develop, anxiety increases, and more (.

Threonine, in particular, is a necessary amino acid that plays an essential role in metabolizing key nutrients, maintaining gut health, and promoting high-quality sleep. Since threonine is an “vital” amino acid, it should be obtained from foods like pasture-raised chicken, almonds, and hemp seeds or a dietary supplement like grass-fed collagen powder.

Depending upon your age, gender, and state of health, threonine dose can vary from 400 to over 1,000 milligrams. To ensure you’re consuming adequate quantities of this vital amino acid, eat an entire food diet plan abundant in protein and collagen. [12]
threonine thrē ´ ənēn [key], organic compound, one of the 22 α-amino acids commonly found in animal proteins. Just the l-stereoisomer appears in mammalian protein. It is among a number of essential amino acids needed in the diet; humans can not manufacture it from simpler metabolites. Young adults need about 14 mg of this amino acid per day per kilogram (6 mg per lb) of body weight. Although threonine participates in many responses in bacteria, including the biosynthesis of vitamin B12 and isoleucine, its metabolic role in higher animals, including man, stays odd. It is understood only as a constituent of proteins, and even in that kind it is fairly unreactive. In spite of the truth that its side chain has a hydroxyl group comparable to that of serine, there is no sign that it takes part in the catalytic functions of any enzyme. Threonine was isolated from the protein fibrin in 1935 and synthesized in the exact same year. [13]


Our Score

Latest from Blog


This short article talks about how federal governments look for public endorsement of their policies through