What is the recommended dosage for BCAAs?

General: 5-10 g/day (2:1:1 leucine:isoleucine:valine); Pre Exercise: 5-10 g; Muscle Preservation: 10-20 g/day during caloric deficit

What are the side effects of BCAAs?

Potential side effects include: Nausea (at high doses), GI discomfort, Fatigue (very high doses).

What are BCAAs and how may they relate to weight management?

Branched-chain amino acids (BCAAs) — leucine, isoleucine, and valine — are essential amino acids involved in muscle protein synthesis. Some research suggests BCAAs may help preserve lean muscle mass during calorie-restricted diets. Their direct effect on fat loss is not well established.

What dosage of BCAAs has been studied in clinical trials?

Clinical trials have used 5–20 grams of BCAAs per day, often in a 2:1:1 ratio of leucine to isoleucine to valine. Studies examining body composition typically lasted 8–12 weeks and often combined BCAA supplementation with resistance exercise.

What are the potential side effects of BCAA supplements?

BCAAs are generally well tolerated at studied doses. Some individuals may experience nausea, fatigue, or loss of coordination at very high doses. BCAAs may interact with diabetes medications by affecting blood sugar levels. Individuals with maple syrup urine disease must avoid BCAA supplementation.

BCAAs
BCAAs

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يُعرف أيضاً بـ: Branched-Chain Amino Acids, Leucine, Isoleucine, Valine, 2:1:1 BCAA

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About

The three branched-chain amino acids — leucine, isoleucine, and valine — that play a key role in muscle protein synthesis and lean mass preservation during caloric restriction. Systematic reviews suggest BCAAs may be most beneficial when total protein intake is suboptimal.

How It Works

Leucine directly activates mTOR signaling to stimulate muscle protein synthesis, preserving lean mass during caloric restriction. Isoleucine enhances glucose uptake in muscle tissue independently of insulin. BCAAs compete with tryptophan for blood-brain barrier transport, potentially reducing central fatigue during exercise. Lean mass preservation maintains basal metabolic rate during weight loss.

Evidence For Conditions

الحالة	التقييم	الدراسات	المشاركون
Muscle Preservation During Weight Loss	B	36	4000	عرض →

Side Effects

Nausea (at high doses)
GI discomfort
Fatigue (very high doses)

Drug & Supplement Interactions

Diabetes medications (may affect blood sugar)
Levodopa (competition for absorption)
Diazoxide

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Related Ingredients

Whey Protein Glutamine Taurine

حقائق سريعة

الجرعة: General: 5-10 g/day (2:1:1 leucine:isoleucine:valine); Pre_Exercise: 5-10 g; Muscle_Preservation: 10-20 g/day during caloric deficit
الأشكال الدوائية: powder capsule tablet liquid
المصادر الطبيعية: Chicken, Beef, Fish, Eggs, Dairy, Lentils, Nuts
الحد الأعلى: No established UL; 35 g/day used safely in clinical trials
أفضل وقت: Pre- or intra-exercise; between meals during caloric restriction

ملخص الأدلة

Muscle Preservation During Weight Loss B

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