BCAAs for Fatigue and Performance: New Research Shows Major Gains

Branched-chain amino acids ( BCAAs ) have been around forever in the supplement world. But every so often, new research comes out that reminds us why they’ve stuck around.

This is one of those times.

A recent study adds serious weight to what I’ve been saying for years: BCAAs don’t just support muscle; they can reduce fatigue and improve physical performance in a big way as well.

If you’re unfamiliar with BCAAs, here’s a quick refresher…

BCAAs are three essential amino acids—leucine, isoleucine, and valine—that your muscles can use directly for energy during exercise. That’s a key distinction from most amino acids, which are primarily used for repair and growth.

BCAAs also influence how your brain perceives fatigue, which is where things get really interesting for performance.

Here's more info on BCAAs: 5 Reasons Your Body Needs Them 

The Study: BCAAs + Training = Better Results

Researchers from the University of Texas had adults aged 60–80 follow an 8-week program combining weight training and aerobic exercise. One group supplemented with 6–9 grams of BCAAs daily, while the other took a placebo.

The results were pretty major:

• The BCAA group saw dramatically greater improvements in both performance and overall function. 
• VO2 max increased by 40% compared to just 18% in the placebo group. 
• Hand grip strength went up by more than 15%, while the placebo group actually lost strength. 
• Walking speed improved by 12% with BCAAs and didn’t improve at all with placebo.
• Chair stand performance jumped 22% versus just 8%.
• On top of all that, the BCAA group reported greater improvements in mobility, quality of life, and reductions in both fatigue and depression.

In short, the subjects taking BCAAs didn’t just improve—they improved significantly more across the board.

Why BCAAs Reduce Fatigue

There are two main mechanisms at play in this study.

First, BCAAs can be used directly by muscle as a fuel source during training. That helps extend performance when energy starts to drop.

Second, valine competes with tryptophan for entry into the brain. When less tryptophan gets in, less serotonin is produced—and serotonin is associated with feelings of fatigue during exercise. Lower serotonin means you feel less tired and can keep pushing.

Even though this study was done in older adults, the underlying physiology doesn’t change with age. Your muscles still use BCAAs for energy, and valine still impacts fatigue through serotonin.

That means these benefits carry over whether you’re 25, 45, or 65.

How I Recommend Taking BCAAs

If your goal is better performance and less fatigue, keep it simple:

Training days: Take 5–10 grams about 30 minutes before workouts.

Non-training days: Take 5–10 grams about 15–30 minutes before a meal.

That’s enough to support both training performance and day-to-day recovery.

A full 6-gram-per-serving dose of BCAAs is present in all Pre JYM products as well as Post JYM BCAAs+ Recovery Matrix . 

If you’ve been overlooking BCAAs, this is a good time to reconsider.

FAQs

What are BCAAs used for?

BCAAs support muscle performance, help reduce fatigue during exercise, and can aid recovery by serving as a direct energy source for working muscles.

Do BCAAs really reduce fatigue?

Yes. Valine, one of the three BCAAs, helps limit serotonin production in the brain during exercise, which can reduce perceived fatigue.

How much BCAA should I take per day?

A daily dose of 5–10 grams is effective for most people, especially when timed around workouts.

Should I take BCAAs before or after workouts?

For performance and fatigue reduction, taking them before workouts is most beneficial.

Do BCAAs help with endurance?

Research shows improvements in VO2 max and overall endurance when BCAAs are combined with training.

Are BCAAs only for older adults?

No. While this study focused on older adults, the benefits apply to all ages due to how BCAAs function in the body.

Where can I find BCAAs?

BCAAs are present in Pre JYM , Pre JYM Plus , Stim-Free Pre JYM , and Post JYM BCAAs+ Recovery Matrix .

Reference

Robbins, R., et al. Branched-chain amino acids combined with exercise improves physical function and quality of life in older adults: Results from a pilot randomized controlled trial. Dietetics 4(32), 2025.

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