What is alanine (L-alanine)?

Alanine is a non-essential amino acid made by the body and obtained from protein-rich foods. It supports protein building and energy-related pathways.

What does alanine do in energy metabolism?

Alanine participates in the glucose-alanine cycle, helping move nitrogen from muscle to the liver. This pathway can support glucose availability during fasting or exercise.

Can alanine improve exercise performance or reduce fatigue?

Alanine may support muscle energy metabolism and is sometimes used in sports supplements. Effects can vary, and benefits are often studied alongside other amino acids.

What foods contain alanine?

Alanine is found in most protein-containing foods, including meat, fish, eggs, dairy, legumes, and soy. Higher-protein diets generally provide more alanine.

What is a typical alanine supplement dose?

Common supplemental amounts are in the hundreds of milligrams; a typical range is about 200–500 mg per day. Individual needs depend on diet, goals, and medical conditions.

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Alanine

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Alanine is a non-essential amino acid supporting energy metabolism, muscle function, and immune health.

Tissue Repair Exercise Performance Immune Booster Glucose Metabolism

dose range

200–500 mg

1–2 doses with meals

Consumption

Take orally with meals to enhance absorption and gastrointestinal tolerance.

Not fat-soluble.

Best time

Often taken before or shortly after exercise for athletic support; equally safe in the morning or with the first meal.

Description

Alanine (L-alanine) is a naturally occurring, non-essential amino acid found in protein-rich foods and produced by the body. It plays crucial roles in energy production, protein synthesis, immune function, and is commonly used in supplements targeting athletic performance and metabolic health.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Moderate-quality evidence from human and animal research supports alanine's metabolic and exercise benefits; limited direct evidence for immune effects.

Supports energy metabolism and glucose regulation

Moderate

Alanine participates in the glucose-alanine cycle, helping transport nitrogen and support blood glucose maintenance during exercise or fasting.

Particularly relevant for: athletes · people with metabolic conditions

S1 · Journal of Clinical Investigation

May reduce fatigue and enhance exercise performance

Limited

Supplementation may lessen muscle fatigue and aid endurance by supporting muscle energy production, especially in combination with other amino acids.

Particularly relevant for: athletes

S2 · European Journal of Applied Physiology

Contributes to immune function and wound healing

Limited

Alanine is involved in immune cell metabolism and may help antibody production and recovery after injury, though direct clinical evidence is limited.

Particularly relevant for: people with increased immune demands · those recovering from injury/surgery

S3 · Nutrients (Review Article)

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Alanine is generally well tolerated at recommended dosages, but high doses or use in at-risk populations require caution.

warning notices

High doses may cause nausea or gastrointestinal upset.
Risk of hypoglycemia if combined with antidiabetic drugs.
Potential accumulation in severe liver or kidney impairment.
Avoid use in individuals with severe liver or kidney disease.
Use caution and monitor blood glucose if taking diabetes medications, as alanine may enhance hypoglycemic effects.

Known interactions with medications

May interact with diabetes medications.

Contraindications / special precautions

Severe liver disease
Severe kidney disease

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Alanine may affect glucose regulation, particularly when combined with diabetes medications.

May enhance blood glucose–lowering effects of diabetes medications.

drug · diabetes medications

MonitorModerate

Why

Alanine can influence glucose metabolism and may potentiate hypoglycemia when taken with antidiabetic drugs.

recommendation

Monitor blood glucose closely when combining alanine with diabetes medications; adjustments may be needed.

S1 · Journal of Clinical Investigation S4 · NIH Office of Dietary Supplements – Amino Acids

mechanisms of action

Brief explanations of how it works

Glucose-Alanine Cycle in Energy Metabolism

Alanine transports amino groups from muscle to liver, facilitating gluconeogenesis and helping stabilize blood glucose during intense activity or fasting.

S1 · Journal of Clinical Investigation