Enhanced muscle protein synthesis
Directly stimulates mTOR pathway for increased muscle protein production
BCAA (Branched-Chain Amino Acids)
Three essential amino acids that directly stimulate muscle protein synthesis, reduce breakdown, and support recovery during training
Scientific nameLeucine, Isoleucine, Valine
FormulaC6H13NO2 (Leucine), C6H13NO2 (Isoleucine), C5H11NO2 (Valine)
Molecular weight131.17, 131.17, 117.15 g/mol
CAS61-90-5, 73-32-5, 72-18-4
95
absorption score
9
safety / 10
40
USD per month
5
documented interactions
Check it against something
BCAA (Branched-Chain Amino Acids) with:
- Amylase
- Ashwagandha
- Avocado Oil
- Beetroot Powder
- Beta-Alanine
- Bifidobacterium lactis
- Bifidobacterium longum
- Bovine Collagen
- Caffeine
- Calcium
- Calcium Bone Formula
- Calcium Carbonate
- Casein Protein
- Chicken Collagen
- Choline (Bitartrate)
- Chondroitin Sulfate
- Coconut Oil
- Collagen Peptides
- Comprehensive Immune Support Complex
- Comprehensive Multivitamin-Mineral Complex
- Creatine HCL
- Creatine Monohydrate
- D-Mannose
- DHA
- Electrolyte Blend
- EPA
- Fish Oil (EPA/DHA)
- Folate (5-MTHF)
- Ginger
- Iron Fumarate
- Iron Sulfate
- Joint Mobility Formula
- Keratin
- Krill Oil
- L-Carnitine
- L-Citrulline
- Lactase
- Lactobacillus acidophilus
- Lactobacillus rhamnosus
- Lipase
- Magnesium Citrate
- Magnesium Glycinate
- Magnesium Oxide
- Marine Collagen
- Melatonin
- Modafinil
- Olive Oil Extract
- Omega-3 + Curcumin + Vitamin D Triple Anti-Inflammatory Formula
- Papain
- Protease
- Saccharomyces boulardii
- Turmeric
- Vitamin B12 (Cyanocobalamin)
- Vitamin B12 (Methylcobalamin)
- Vitamin C (Ascorbic Acid)
- Vitamin C (Sodium Ascorbate)
- Vitamin D3
- Whey Protein
- Zinc Gluconate
Nothing found
82
out of 100
Works better together
Compatible. Timing differs, so follow each supplement's own window.
What it does
mechanism and evidence for each claimReduced muscle protein breakdown
Decreases muscle catabolism during and after exercise
Improved exercise performance and endurance
May enhance exercise capacity and reduce perceived exertion
Enhanced recovery between sessions
Accelerates muscle repair and reduces recovery time
Reduced muscle soreness and fatigue
May decrease delayed onset muscle soreness (DOMS)
Others take these for the same thing
Same goal, different mechanism — check any of them against this one
Creatine Monohydrate
Strength & power enhancement
3-5g
A
95%
Calcium
Bone health & muscle function
1,000-1,200 mg
A
30%
Magnesium Glycinate
Superior absorption sleep & muscle support
200-600 mg
A
90%
Whey Protein
Muscle growth & recovery
25-75g
A
95%
Creatine HCL
Enhanced muscle building
1.5-3g
B
98%
Oregano Oil
Powerful respiratory antimicrobial
100-300mg
B
85%
Every pair we checked
12 combinations scored by the engine
BCAA (Branched-Chain Amino Acids) + Caffeine
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Creatine Monohydrate
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Calcium Carbonate
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Lactase
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Bovine Collagen
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + DHA
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Turmeric
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Fish Oil (EPA/DHA)
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Magnesium Oxide
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Marine Collagen
No documented interaction either way
No known interaction
70
BCAA (Branched-Chain Amino Acids) + Vitamin D3
Enhanced BCAA metabolism and utilization
Works better together
78
BCAA (Branched-Chain Amino Acids) + Whey Protein
Enhanced muscle protein synthesis with complete amino acid profile
Works better together
82
Dosage
Daily10-20g
Muscle preservation10-15g between meals or during fasting
Exercise performance10-15g during prolonged exercise sessions
Recovery enhancement10-15g immediately post-workout
Aging muscle support10-15g with meals to boost leucine content
When to expect it
First Effects30-60 minutes for initial muscle protein synthesis stimulation
Peak Benefits1-3 hours for maximum anabolic response
Deficiency DevelopmentEssential amino acids - deficiency develops with inadequate protein
Toxicity OnsetNo acute toxicity - chronic high doses may affect insulin sensitivity
How to measure it
MarkerPlasma BCAA levels, muscle protein synthesis markers
OptimalLeucine 120-200 μmol/L, balanced BCAA profile
Deficient belowLow plasma BCAA levels indicating protein deficiency
FrequencyMonitor with protein status assessment if concerned about adequacy
What people actually reported to the FDA
CAERS, 54 reports naming it as the suspectMost reported effects
Named as the suspect
54 reports
of 67 that mention it at all
Serious outcome
85%
hospitalisation, emergency room or worse
Other Serious or Important Medical Event25
Hospitalization16
Visited Emergency Room11
Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →
What actually reaches you
The label counts the carrier, your body does not
Absorption
Very high 95 of 100 · best absorbed form of this compound
Delivered daily
14250 mg
Cost per 100 mg delivered
$0.01 comparative — uses the absorption score, not a measured percentage
Works better with
+
Whey Protein
Enhanced muscle protein synthesis with complete amino acid profile
BCAAs provide immediate stimulus while protein provides full spectrum · level A
+
Carbohydrates
Enhanced BCAA uptake and utilization
Insulin response improves amino acid uptake into muscle · level B
+
Vitamin B6
Enhanced BCAA metabolism and utilization
Cofactor for BCAA transamination and metabolism · level BWhat not to take with BCAA (Branched-Chain Amino Acids)
!
Excessive Tryptophan
High tryptophan may compete with BCAA transport
Competition for large amino acid transporter · minor significance
!
Aromatic Amino Acids
High phenylalanine/tyrosine may compete with BCAA effects
Competition for transport and metabolism · minor significanceMedication interactions
Discuss these with a pharmacist before combiningBCAAs may affect blood sugar and insulin sensitivity
What to do: Monitor blood glucose levels with diabetes medications
BCAAs may reduce levodopa absorption and effectiveness
What to do: Separate timing by several hours
Available forms
BCAA 2:1:1 Ratio (Leucine:Isoleucine:Valine): Direct muscle uptake, Proven anabolic effects, Excellent safety, Rapid absorption
Food sources
Whey protein (30g)
6-8g BCAAs (high leucine) · 95
Chicken breast (100g)
4-5g BCAAs · 90
Eggs (2 large)
2.5g BCAAs · 90
BCAA supplements
5-15g per serving · 95
Too little
- BCAA deficiency symptoms (part of protein deficiency):
- Muscle wasting and poor muscle growth
- Slow recovery from exercise
- Poor exercise performance and capacity
- Increased muscle breakdown during training
- Fatigue and weakness
- Impaired immune function
Too much
- Generally very safe - potential concerns with excessive use:
- Insulin resistance with chronic high doses
- Amino acid imbalances affecting other nutrients
- Gastrointestinal upset with high single doses
- Reduced effectiveness of other amino acids
- Interference with complete protein utilization
Who benefits most
endurance-athletes
Prevents muscle breakdown during long training sessions
10-15g during exercise or between meals
fasted-training-athletes
Provides muscle protection when training without food
10-15g pre-workout on empty stomach
calorie-restricted-athletes
Helps preserve muscle mass during cutting or weight loss
10-15g between meals to maintain protein synthesis
aging-muscle-preservation
Combats age-related muscle protein synthesis decline
10-15g with meals to enhance leucine content
plant-based-athletes
Supplements potentially lower BCAA content in plant proteins
10-15g with plant protein mealsWhere to buy it
Look for BCAA (Branched-Chain Amino Acids) at 10-20g per serving. The form that matters here is BCAA 2:1:1 Ratio (Leucine:Isoleucine:Valine).
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What else affects it
Beyond other supplements
+
Carbohydrates
Enhanced BCAA uptake and utilization
Insulin response improves amino acid uptake into muscle
!
Excessive tryptophan
High tryptophan may compete with BCAA transport
Competition for large amino acid transporterHow it works
- Leucine directly activates mTOR pathway stimulating protein synthesis
- Provides substrate for muscle protein production
- Reduces muscle protein breakdown during exercise and fasting
- Competes with tryptophan reducing central fatigue during exercise
- Supports ATP production through direct muscle metabolism
- Maintains positive nitrogen balance during stress
Key findings
what the evidence supports- Leucine is the primary driver of muscle protein synthesis among BCAAs
- Most effective when total protein intake is suboptimal
- May be particularly beneficial for endurance exercise and aging
- Complete proteins generally more effective than isolated BCAAs
Sources: NIH Examine.com PubMed 28934166 · data reviewed 2026-08-02
Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →
Common questions
What are the benefits of BCAA (Branched-Chain Amino Acids)?
Documented effects: Enhanced muscle protein synthesis; Reduced muscle protein breakdown; Improved exercise performance and endurance; Enhanced recovery between sessions. Directly stimulates mTOR pathway for increased muscle protein production
How much BCAA (Branched-Chain Amino Acids) should you take per day?
The common daily range is 10-20g. By goal — muscle preservation: 10-15g between meals or during fasting; exercise performance: 10-15g during prolonged exercise sessions; recovery enhancement: 10-15g immediately post-workout; aging muscle support: 10-15g with meals to boost leucine content.
When is the best time to take BCAA (Branched-Chain Amino Acids)?
Around workouts and between meals. First effects are typically reported within 30-60 minutes for initial muscle protein synthesis stimulation.
What are the side effects of BCAA (Branched-Chain Amino Acids)?
At excessive doses: Generally very safe - potential concerns with excessive use:, Insulin resistance with chronic high doses, Amino acid imbalances affecting other nutrients, Gastrointestinal upset with high single doses, Reduced effectiveness of other amino acids. Safety rating at normal doses is 9 out of 10.
What should you not take with BCAA (Branched-Chain Amino Acids)?
Separate it from Excessive Tryptophan, Aromatic Amino Acids by two to four hours. High tryptophan may compete with BCAA transport
Does BCAA (Branched-Chain Amino Acids) interact with medications?
Documented interactions with diabetes-medications, levodopa. Discuss these with a pharmacist before combining.
How do you know if you need BCAA (Branched-Chain Amino Acids)?
The marker is Plasma BCAA levels, muscle protein synthesis markers, optimal range Leucine 120-200 μmol/L, balanced BCAA profile. Common deficiency signs: BCAA deficiency symptoms (part of protein deficiency):, Muscle wasting and poor muscle growth, Slow recovery from exercise, Poor exercise performance and capacity.