Leucine is an essential branched-chain amino acid (BCAA) that must come from food or supplements. It plays a key role in signaling muscle protein synthesis.

How does leucine support muscle growth?

Leucine helps activate the mTOR pathway, which is involved in initiating muscle protein synthesis. This can support muscle repair and growth when paired with adequate protein and training.

What is a typical leucine dose?

Common supplemental amounts are about 2–5 g per serving. Individual needs vary based on diet, body size, and training goals.

When should you take leucine?

It’s often taken around workouts or with meals to support muscle protein synthesis. Many people use it alongside a complete protein source.

Leucine is generally well tolerated at typical supplemental doses for healthy adults. People with medical conditions or those taking medications should consult a clinician before use.

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Leucine

Orta düzeyde araştırma durumu·7/10

Daha yüksek puan, daha iyi bir çalışma durumuna işaret eder, ancak mutlaka etkinlik anlamına gelmez.

Leucine is an essential amino acid crucial for muscle protein synthesis, recovery, and metabolic regulation.

Exercise Recovery Muscle Repair Essential Nutrient Exercise Performance Muscle Gain Glucose Metabolism Weight Management

Doz aralığı

2–5 g

Single or split around workouts/meals

Gelir

Take with a meal or as part of a protein/BCAA supplement. Athletes may use up to 10 g under supervision.

Yağda çözünmez.

En iyi zaman

Commonly taken pre- or post-workout. Can be taken with the first meal for anabolic support.

Açıklama

Leucine is one of three branched-chain amino acids (BCAAs) that must be obtained through diet or supplementation. It plays a unique role in activating the key pathways of muscle protein synthesis and may support muscle recovery, performance, and metabolic function.

Avantajlar

Kanıt derecesi ile ana etkiler

Moderate

Kanıtla ilgili not

Leucine has strong evidence for muscle protein synthesis and moderate support for improved recovery and limited but growing evidence for metabolic regulation.

Stimulates muscle protein synthesis

Strong

Leucine is a primary trigger for activating the mTOR pathway, leading to increased muscle protein synthesis and promoting muscle repair and growth.

Özellikle ilgili olduğu kişiler: Athletes · Older Adults · Active Individuals

S1 · American Journal of Clinical Nutrition – Leucine increases muscle protein synthesis S5 · Examine.com – Leucine

Supports muscle recovery after exercise

Moderate

Supplementation can reduce exercise-induced muscle soreness and improve strength recovery.

Özellikle ilgili olduğu kişiler: Athletes · Active Individuals

S2 · Journal of the International Society of Sports Nutrition – Effects of leucine-enriched supplements post-exercise S5 · Examine.com – Leucine

May aid metabolic health and weight management

Limited

Leucine may help regulate blood sugar, support insulin sensitivity, and favorably impact body composition, though this evidence is preliminary.

Özellikle ilgili olduğu kişiler: Individuals Managing Weight · People with Insulin Resistance

S3 · Nutrients – Leucine supplementation and metabolic health S5 · Examine.com – Leucine

Güvenlik ve Uyarılar

Önemli güvenlik bilgileri ve bilinen riskler

Sadece eğitim amaçlıdır • tıbbi tavsiye değildir

Leucine is generally safe at recommended doses for healthy individuals but poses risks in specific populations.

Uyarılar

Adverse effects may include gastrointestinal discomfort at high intakes.
Toxicity risk exists for those with maple syrup urine disease or advanced kidney disease.
Chronic excess leucine can cause amino acid imbalance.
Avoid leucine supplementation if you have maple syrup urine disease.
Do not use leucine supplements in cases of severe kidney impairment unless under clinical supervision.
Monitor for hypoglycemia when combining leucine with diabetes medications.

İlaçlarla bilinen etkileşimler

May enhance effects of anti-diabetic drugs.

Kontrendikasyonlar / özel dikkat gerektiren gruplar

Maple syrup urine disease
Advanced renal impairment

etkileşimler

Etkin madde ↔ takviye / ilaç / gıda arasındaki önemli etkileşimler

Leucine interacts with certain medications, notably for diabetes, and may impact branched-chain amino acid balance.

Leucine may enhance effects of anti-diabetic drugs.

drug · Diabetes medications

MonitorModerate

Neden

Leucine can improve insulin sensitivity and lower blood glucose, potentially increasing hypoglycemia risk when combined with diabetes medications.

Öneri

Monitor blood glucose closely when using leucine alongside diabetes drugs.

S3 · Nutrients – Leucine supplementation and metabolic health S4 · NIH ODS – Branched Chain Amino Acids Fact Sheet

Leucine may be unsafe in severe kidney impairment.

lifestyle · Chronic Kidney Disease

AvoidStrong

Neden

Impaired clearance in chronic kidney disease can worsen metabolic disturbances and lead to toxicity.

Öneri

Do not supplement leucine with advanced kidney disease unless advised by a specialist.

S4 · NIH ODS – Branched Chain Amino Acids Fact Sheet S6 · EFSA Journal – BCAA Safety evaluation

Etki mekanizmaları

Nasıl çalıştığına dair kısa açıklamalar

mTOR pathway activation

Leucine uniquely stimulates the mTOR signaling pathway, which increases muscle protein synthesis and anabolic processes.

S1 · American Journal of Clinical Nutrition – Leucine increases muscle protein synthesis S5 · Examine.com – Leucine

Modulation of glucose metabolism

Leucine has been shown to increase insulin secretion and improve glucose uptake in animal and early human studies, which may support metabolic health.

S3 · Nutrients – Leucine supplementation and metabolic health S5 · Examine.com – Leucine

Kaynaklar ve Referanslar

Bu ifadelerin dayandığı birincil kaynaklar ve incelemeler

6 sources

American Journal of Clinical Nutrition – Leucine increases muscle protein synthesis

Key study on leucine’s effect on muscle protein synthesis.

Journal of the International Society of Sports Nutrition – Effects of leucine-enriched supplements post-exercise

Muscle recovery benefits of leucine.

Nutrients – Leucine supplementation and metabolic health

Overview of metabolic effects and glycemic control.

NIH ODS – Branched Chain Amino Acids Fact Sheet

General safety and dietary information.