Introduction

L-Threonine is an essential amino acid required for protein synthesis, maintenance of gut integrity, immune function, and formation of collagen, elastin, and mucin proteins. Because the body cannot produce threonine, it must be obtained from diet or supplements.

What Is L-Threonine?

L-Threonine is an essential amino acid involved in structural protein formation and digestive health.

• Type: Essential amino acid
• Main role: Protein synthesis and gut lining support
• Storage: Not stored; used as needed

How L-Threonine Works in the Body

L-Threonine supports the structure and function of proteins involved in digestion, immunity, and tissue repair.

• Helps form collagen and elastin
• Supports mucin production in the gut lining
• Plays a role in immune system function
• Supports nervous system health

Sources of L-Threonine

• Eggs
• Dairy products
• Meat and poultry
• Fish
• Legumes
• Seeds and nuts

L-Threonine Deficiency

L-Threonine deficiency is rare but may occur with inadequate protein intake or digestive disorders.

Possible deficiency symptoms include:

• Digestive issues
• Weakened immunity
• Fatigue
• Poor wound healing
• Loss of muscle mass

Dosage & How to Take L-Threonine

• Daily dietary intake: ~1–2 g/day
• Supplemental dose: 500–2000 mg/day
• Higher needs: Gut health or recovery support

L-Threonine can be taken with meals or between meals.

Forms of L-Threonine

• Free-form L-Threonine
• Capsules or tablets
• Protein supplements

Benefits & Uses

• Supports gut lining and digestion
• Enhances immune defense
• Supports collagen and skin health
• Supports muscle protein synthesis
• Contributes to nervous system health

Safety, Side Effects & Precautions

• Generally safe at recommended doses
• Excess intake may cause digestive discomfort
• Maintain balanced amino acid intake
• People with kidney disorders should consult a doctor

Special Populations

• People with digestive disorders: Supports gut integrity
• Athletes: Supports recovery and protein synthesis
• Elderly: Supports muscle and immune health
• Vegetarians: May have lower intake

Frequently Asked Questions

What does L-Threonine do in the body?

L-Threonine supports protein synthesis, gut health, immunity, and collagen formation.

Is L-Threonine good for gut health?

Yes. It is essential for mucin production that protects the gut lining.

Can L-Threonine be taken daily?

Yes. Daily intake from food or supplements is safe.

Is L-Threonine important for immunity?

Yes. It supports immune protein production and gut-associated immunity.

Best time to take L-Threonine?

With meals or between meals depending on tolerance.