A review by Jang and colleagues raises a spicy possibility: Could essential amino acids, or EAAs, help “bypass” the cardio/lifting interference effect?
Is this a mousetrap or meathead magic?
Strap in, you beautiful iron-slinging mitochondria hoarder, as we break this down.
The review appeared in Nutrients in 2026, and buried inside the usual academic furniture was a sentence spicy enough to make the supplement aisle start levitating.
One sentence basically walked into the strength-and-cardio cage match wearing brass knuckles and a lab coat.
The quote
“Owing to their dual role as anabolic stimulus via mTORC1 activation and as a precursor for MPS, free EAAs can bypass such interference without hindering adaptations to either RT or ET.”
— Jang, Wolfe and Kim, Nutrients, 2026
“Can bypass.”
That is their phrase.
Not mine.
Also not some supplement bro with frosted tips yelling into a podcast mic next to a tub of neon mango pre-workout.
A peer-reviewed review suggested that free essential amino acids might sidestep the old resistance-training-plus-endurance-training interference problem.
Yes, that interference problem.
The one lifters have been arguing about since cardio first crawled out of the swamp wearing tiny blue running shorts with full berries and twig on display.
Before you shotgun EAAs into your blender bottle and declare the decades-long war over, park the hype bus.
Because this is where the story gets weird, useful and very rodent-shaped.
The mechanism
Free-form EAAs are interesting because they do two jobs at once.
- They can activate mTORC1, the cellular foreman that screams, “Start building, you magnificent bastards!”
- Those same EAAs also provide the raw material for muscle protein synthesis.
Contractile proteins? Yes, the stuff that helps you move more iron.
Mitochondrial proteins? Also yes, the endurance machinery that keeps your engine from wheezing like a leaf blower full of gravel.
That is the trick the authors are pointing at.
Not fairy dust.
Cellular logistics.
Resistance training wants amino acids for myofibrillar remodeling.
Endurance training wants amino acids for mitochondrial remodeling.
Free EAAs, in theory, may help feed both crews without one crew mugging the other in the parking lot.
Clean idea.
Very seductive.
…But also not remotely settled in humans. Jang, Wolfe and Kim, 2026
The receipts
The proposed mechanism draws on Jang et al.’s 2024 mouse study in the Journal of Cachexia, Sarcopenia and Muscle.
In that study, free EAA feeding plus resistance training improved endurance capacity compared with resistance training alone. The researchers also investigated DRP1-dependent mitochondrial remodeling. Jang et al., 2024
DRP1 is involved in mitochondrial fission and remodeling, which is nerd-speak for your mitochondria not being static little magical energy-producing beans.
They are dynamic, twitchy, shape-shifting power plants that remodel based on the stress you throw at them.
Awesome.
Useful.
Mechanistically tasty.
However, still in mice.
And those mice were not following a combined resistance-and-endurance training program. Better endurance after EAAs plus lifting does not, by itself, demonstrate that EAAs prevent concurrent-training interference.
Lab mice are not 44-year-old meatheads trying to squat on Monday, hit a 2K row on Tuesday and survive a work meeting where someone says “circle back” 14 times.
Rodent data can point the flashlight.
Human trials have to walk the trail.
The evidence discussed here does not establish that complete EAAs bypass the interference effect in human lifters doing concurrent training.
However, that does not make the claim stupid.
It makes the claim early.
One more adult-in-the-room note: Read the authors’ conflict-of-interest disclosures alongside the findings.
Conflict does not automatically equal fraud.
But it does mean your hype detector should not be asleep in a recliner with nacho cheese on its shirt.
Read the paper.
Respect the mechanism.
Calibrate the verb.
What this means
At a basic level, not a ton changes.
Lift heavy.
Keep your easy cardio easy enough that your soul is not trying to leave your body. When you go hard on cardio, go hard.
Fuel like an adult.
Stop treating one mouse study like Moses came down from Mount mTOR holding EAA tablets.
We also have human research supporting the role of EAAs in muscle protein synthesis. That is a different claim from proving that they erase interference between strength and endurance adaptations. Jang, Wolfe and Kim, 2026
How I use EAAs
I have incorporated a substantial dose of EAAs into my morning routine: wake up, take EAAs, do my morning walk, then hit the rower or bike.
During the months I’ve used this routine, I’ve felt better in the morning, experienced very little muscle soreness and had good afternoon lifting sessions.
That is my experience, not proof that the EAAs caused those changes.
Not a miracle or drug-like effects. More like sending a fast-response construction crew into a job site before the drywall guys start fighting the electricians.
Complete EAAs can stimulate muscle protein synthesis in humans. Leucine plays an important signaling role, while the full set of essential amino acids supplies the building blocks.
The bleeding-edge part is whether they can truly blunt or bypass interference between resistance and endurance training adaptations.
I use and recommend Kion Aminos, which contains all nine essential amino acids, including leucine. Kion product information
Plus, they taste pretty good. Much, much better than most EAAs I’ve tried.
I have used raw EAAs, and they don’t mix worth a crap and smell like cat piss.
Full disclosure: I’m a Kion affiliate and may earn a commission if you purchase through my link.
I’ve also spoken with Kion co-founder Angelo Keely. Check out my podcast with him if you want the deep dive into all things EAAs.
The takeaway
The boring answer is still the powerful one.
Do the big rocks first.
Lift hard.
Violent consistency.
Keep your cardio intelligent, as I teach in the Flexible Meathead Cardio courses.
And consider EAAs if they fit your nutrition needs and you want to explore the possibilities.
Just keep “interesting mechanism” and “proven interference fix” in separate compartments of your meathead brain.
