Across 22 studies the daily BCAA dose ranged from 1.5 g to 82 g, which is a 55-fold spread. That is not a field that has agreed on anything.
The 1 dose figure with a condition attached comes from the soreness literature. It is 255 mg per kg per day, as a ceiling rather than a target.
Quick Answer: How Much BCAA Should You Take?
There is no established dose. A 2025 systematic review of 22 studies found daily amounts ranging from 1.5 g to 82 g. The clearest figure comes from soreness research, where doses up to 255 mg per kilogram per day in trained people blunted symptoms, which is about 20 g for an 80 kg adult. Our serving is 1000 mg, well below all of that.
Key Takeaways
- Across 22 studies the daily dose ranged from 1.5 g to 82 g.
- The soreness ceiling was 255 mg per kg per day in trained subjects.
- For an 80 kg adult that ceiling works out near 20 g daily.
- Our serving is 2 capsules delivering 1000 mg in a 2:1:1 ratio.
- Timing mattered in 1 way: not dosing only after the exercise.
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Why There Is No Standard Dose
The honest starting point is what the literature actually used, rather than a number invented for a label.
| Source | Scope | Dose information |
|---|---|---|
| Cureus systematic review, 2025 | 22 studies, 511 participants | 1.5 g to 82 g daily |
| Same review | Body composition | 1 study found a significant difference |
| Same review | Meta-analysis | Not performed, due to risk of bias |
| Amino Acids meta-analysis, 2021 | 10 trials on soreness | Up to 255 mg per kg per day |
A 55-fold range across studies means any single recommended number is a choice rather than a finding.[1]The Effect of Oral Pure Branched-Chain Amino Acid Supplementation on Exercise Performance and Body Composition: A Systematic Review — Cureus (2025) View source What those doses were being asked to achieve is covered in the main BCAA guide.
The One Figure With Conditions Attached
The soreness meta-analysis produced the most usable number in the field, and it came with 4 qualifiers.
- Who: Trained subjects, not untrained ones.
- How much: Up to 255 mg per kg per day.
- What kind of session: Mild to moderate muscle damage.
- When: Not only after the damaging exercise.
Seven of the 10 trials found BCAAs reduced soreness at 24 to 72 hours, and the review could not conclude anything for untrained people or for higher doses.[2]The use of BCAA to decrease delayed-onset muscle soreness after a single bout of exercise: a systematic review and meta-analysis — Amino Acids (2021) View source The soreness question in full is in the four conditions on that finding.
The Arithmetic on a Capsule
Putting the label next to the literature is more useful than either on its own.
| Figure | Amount |
|---|---|
| Our serving | 2 capsules, 1000 mg total BCAA |
| Ratio | 500 mg leucine, 250 isoleucine, 250 valine |
| Also per serving | 600 mg L-glutamine, plus 3 B vitamins |
| Soreness ceiling for an 80 kg adult | About 20.4 g per day |
| Lowest dose used in the 22 studies | 1.5 g per day |
A gram is below even the lowest study dose, which is a reason to treat capsules as a small addition rather than as the intervention those trials tested. A review of 24 studies in athletes also found the benefits on performance and body composition negligible at any of the doses used.[3]Oral Branched-Chain Amino Acids Supplementation in Athletes: A Systematic Review — Nutrients (2022) View source
Timing
Most timing advice online is invented. Only 1 timing statement has evidence behind it.
| Question | What the evidence supports |
|---|---|
| Before or after training | Not only after; the soreness trials dosed around the session |
| Morning or night | No trial has compared these directly |
| Fasted or fed | No trial supports a fasted advantage |
| On rest days | Not studied separately |
| Our label directions | 2 capsules 40 minutes before a workout |
Whether the timing matters at all depends on whether the supplement adds anything to your diet, which is the question in how BCAAs compare with EAA and creatine.
A Sensible Approach
Short, and mostly about what to fix first.
- First: Get total daily protein right.
- Then: Consider creatine, which has the larger evidence base.
- Then: BCAAs for soreness, around the session rather than after.
- Dose: Follow the label; more is not supported by these 22 studies.
Our label directs 2 capsules 40 minutes before a workout, and the bottle holds 30 servings on that basis.
Speak to a Clinician Rather Than Adjusting a Dose If
- Existing liver disease or cirrhosis, where BCAA use is a clinical decision rather than a self-directed one
- Reduced kidney function or a raised creatinine result, which needs a clinician
- Persistent nausea or diarrhoea while supplementing, which affected 12% in the Cochrane data
- Any diagnosed disorder of amino acid metabolism
- Using BCAAs to replace meals or to train in a prolonged calorie deficit without support
Frequently Asked Questions
How much BCAA should I take? +
There is no established dose. Across 22 studies the daily amount ranged from 1.5 g to 82 g, and our serving is 1000 mg.
When to take BCAA for best results? +
The soreness trials dosed around the session rather than only afterwards. That is the 1 timing point with evidence behind it.
When is the best time to take BCAAs? +
Our label directs 2 capsules 40 minutes before a workout. No trial has compared morning against evening dosing directly.
Is it better to take BCAAs at night or morning? +
There are 0 trials comparing the 2. Consistency around training matters more than the hour.
How long does BCAA take to kick in? +
For soreness, the 2021 meta-analysis measured effects at 24 to 72 hours after the session rather than within minutes.
Should I take BCAA every day? +
The trials mostly dosed around training. There is no evidence that daily use adds anything if your protein intake already covers the 3 amino acids.
Can I take more than the label says? +
The soreness ceiling was 255 mg per kg per day, which is about 20 g for an 80 kg adult. Higher doses were not shown to help in that review.
Should I take BCAAs on rest days? +
Rest-day dosing has been studied in 0 trials separately. Total protein across the day is the more useful lever.
Do I take them fasted? +
No trial supports a fasted advantage. The fasted-training argument rests on the muscle-sparing claim, which has 0 controlled support.
How many capsules is a serving? +
Two capsules, delivering 1000 mg of BCAA in a 2:1:1 ratio plus 600 mg of L-glutamine.
Is 5 g the standard dose? +
It is a common label figure rather than a research consensus. The studies used anything from 1.5 g to 82 g.
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