Reviewed by the Celnovix Editorial Team
Last reviewed: September 2026
Urolithin A is increasingly marketed around:
- Muscle health
- Healthy aging
- Mitochondria
- Exercise performance
That naturally leads to a simple question:
Does Urolithin A actually build muscle?
Based on current human evidence:
not in the traditional muscle-building sense.
Urolithin A has shown promising effects on selected measures of:
- Muscle strength
- Muscle endurance
- Mitochondrial biomarkers
But human trials have not established that it meaningfully increases:
muscle mass or muscle size.
That distinction matters.
A supplement can potentially improve:
muscle function
without necessarily producing:
muscle hypertrophy.
So Urolithin A should not currently be positioned like:
- Protein
- Essential amino acids
- Creatine
- Resistance training
when the goal is directly increasing muscle tissue.
Its scientific role appears to be different.
Does Urolithin A Build Muscle? Quick Answer
Current evidence suggests:
- Urolithin A may improve selected measures of muscle strength.
- It may improve muscle endurance in some populations.
- It influences mitochondrial and mitophagy-related biomarkers.
- It has been studied in middle-aged and older adults.
- It has also been tested in resistance-trained athletes.
- It has not been proven to significantly increase muscle mass.
- It is not a replacement for resistance training.
- It does not provide protein or essential amino acids.
The most accurate summary is:
Urolithin A may support how muscle functions, but current evidence does not establish it as a direct muscle-building supplement.
What Does “Building Muscle” Actually Mean?
When people say:
build muscle
they usually mean:
skeletal muscle hypertrophy.
Hypertrophy refers to an increase in:
muscle fiber size
that ultimately contributes to increased:
muscle mass.
Muscle growth is strongly driven by:
- Resistance training
- Mechanical tension
- Adequate protein
- Sufficient energy intake
- Recovery
Supplements can support this process.
But they cannot replace the underlying:
training stimulus.
Muscle Strength Is Not the Same as Muscle Growth
This is one of the most important distinctions in this article.
A person can become:
stronger
without gaining a large amount of new muscle.
Strength also depends on:
- Neural adaptations
- Motor-unit recruitment
- Coordination
- Muscle quality
- Energy metabolism
So when a Urolithin A study reports improved strength, that does not automatically mean participants:
built more muscle tissue.
Muscle Endurance Is Also Different
Muscle endurance refers to the ability to:
continue repeated contractions before fatigue.
For example:
- Repeated leg contractions
- Grip repetitions
- Repeated lifting
- Sustained movement
Improving endurance does not necessarily mean:
larger muscles.
This distinction becomes especially important when interpreting Urolithin A research.
What Is Urolithin A?
Urolithin A is a metabolite related to foods containing:
- Ellagitannins
- Ellagic acid
Examples include:
- Pomegranate
- Walnuts
- Berries
Certain gut bacteria can convert those compounds into:
Urolithin A.
But not everyone naturally produces the same amount.
Read:
Why Can’t Everyone Produce Urolithin A? Gut Metabotypes Explained
Why Is Urolithin A Studied for Muscle Health?
The main scientific reason is:
mitochondrial quality control.
Muscle tissue requires large amounts of energy.
Mitochondria help produce ATP needed for:
- Movement
- Exercise
- Muscle contraction
- Recovery
With aging and cellular stress, damaged mitochondria can accumulate.
One pathway used to remove damaged mitochondria is:
mitophagy.
What Is Mitophagy?
Mitophagy is the selective removal of:
damaged or dysfunctional mitochondria.
A simplified sequence looks like:
Damaged mitochondria
↓
Cell recognizes dysfunction
↓
Mitophagy machinery activates
↓
Damaged mitochondria are broken down
↓
Components are recycled
Urolithin A has attracted attention because it appears to influence pathways associated with this process.
Read:
Urolithin A and Mitophagy: How Does It Actually Work?
Does Better Mitophagy Mean Bigger Muscles?
No.
This is where supplement marketing can become misleading.
Mitophagy relates primarily to:
quality control.
Muscle hypertrophy depends much more directly on:
- Mechanical loading
- Protein synthesis
- Amino acid availability
- Training volume
- Recovery
So:
better mitochondrial recycling ≠ automatic muscle growth.
What Did the Middle-Aged Human Trial Find?
One major randomized trial included:
88 untrained, overweight, middle-aged adults.
Participants received:
- Placebo
- 500 mg Urolithin A per day
- 1,000 mg Urolithin A per day
for:
four months.
Researchers measured:
- Muscle strength
- Peak power
- Aerobic performance
- Mitochondrial biomarkers
Did Urolithin A Improve Strength?
Yes, selected strength outcomes improved.
Researchers reported approximately:
12% improvement
in certain leg-muscle strength measures.
Both 500 mg and 1,000 mg groups showed significant improvement in selected hamstring-strength measurements compared with placebo.
This is encouraging.
But it is important not to overinterpret it.
Did Urolithin A Increase Muscle Mass in That Trial?
The study did not establish Urolithin A as:
a muscle-mass-building intervention.
The strongest reported outcomes involved:
- Strength
- Exercise performance
- Mitochondrial biomarkers
rather than clear increases in:
lean muscle tissue.
That is why describing UA as a direct:
muscle builder
would go beyond the evidence.
What About Peak Power?
The study’s primary endpoint involved:
peak power output.
That endpoint did not significantly improve compared with placebo.
This matters because primary endpoints are selected in advance as the main outcome the study is designed to test.
Positive secondary findings should not erase a:
non-significant primary endpoint.
What About Older Adults?
Another randomized clinical trial studied:
66 adults aged 65–90 years.
Participants received:
1,000 mg Urolithin A per day
or placebo for:
four months.
Researchers evaluated:
- Muscle endurance
- Walking performance
- Mitochondrial ATP production
- Blood biomarkers
Did Urolithin A Build Muscle in Older Adults?
No clear muscle-growth effect was established.
The strongest positive finding involved:
muscle endurance.
Selected hand and leg muscles were able to perform more repeated contractions before fatigue.
Again:
better endurance is not the same as hypertrophy.
Did Walking Performance Improve?
Not significantly compared with placebo.
The Urolithin A group improved its six-minute walk distance.
But the difference between groups did not reach:
statistical significance.
So the study should not be summarized as proof that Urolithin A:
improves overall mobility.
Did Mitochondrial ATP Production Improve?
Not significantly.
Maximal mitochondrial ATP production was one of the study’s primary endpoints.
It did not significantly improve compared with placebo.
That finding reinforces the need to separate:
mitochondrial biomarker changes
from:
direct functional outcomes.
What Does the 2026 Meta-Analysis Say?
A 2026 systematic review and meta-analysis evaluated:
5 randomized controlled trials
with:
236 participants.
Researchers examined:
- Muscle strength
- Muscle endurance
- Aerobic capacity
- Walking performance
- Mitochondrial biomarkers
Only the:
six-minute walking test
had enough comparable data for formal pooling.
Did Urolithin A Significantly Improve Walking?
No.
The pooled effect was:
+17.03 meters
favoring Urolithin A.
But the 95% confidence interval ranged from:
−5.33 to +39.40 meters
and:
P = 0.135.
That means the result did not reach statistical significance.
The evidence certainty was rated:
low.
What About Muscle Strength in the Meta-Analysis?
Strength outcomes were too heterogeneous to combine reliably.
Different studies used different:
- Populations
- Doses
- Strength tests
- Study durations
So researchers described the strength findings as:
exploratory.
That means:
interesting but not yet reproducible enough for strong claims.
What Does the 2024 Systematic Review Say?
A separate 2024 systematic review evaluated:
five human studies
involving approximately:
250 healthy people.
Urolithin A doses ranged from:
10 to 1,000 mg per day
for:
28 days to four months.
The review found evidence of changes involving:
- Muscle strength
- Muscle endurance
- Mitochondrial genes
- Autophagy markers
- Fatty-acid oxidation
But there were no consistent effects on:
- Overall physical function
- Anthropometric outcomes
- Maximal mitochondrial ATP production
What About Resistance-Trained Athletes?
This is a useful piece of the puzzle.
A randomized, double-blind, placebo-controlled study investigated Urolithin A in:
male athletes performing resistance training.
The intervention lasted:
eight weeks.
Researchers measured:
- Bench-press 1RM
- Squat 1RM
- Maximum voluntary isometric contraction
- Repetitions to failure
- Inflammation and oxidative-stress markers
Did Urolithin A Increase Bench Press or Squat Strength?
Not significantly.
Compared with placebo:
- Bench-press 1RM increased numerically
- Squat 1RM increased numerically
but neither reached:
statistical significance.
This is important because those are highly relevant conventional strength outcomes.
Did Anything Improve in the Athlete Study?
Yes.
The Urolithin A group showed significant improvements in:
- Maximum voluntary isometric contraction
- Repetitions to failure
compared with placebo.
Those results again point toward:
muscle-function and fatigue-resistance effects
rather than clear evidence of:
muscle hypertrophy.
Did Athletes Gain More Muscle Mass?
The available human evidence does not establish a meaningful UA-driven increase in:
skeletal muscle mass.
That remains a major gap.
Why Might Urolithin A Improve Function Without Increasing Muscle Size?
Several mechanisms are biologically plausible.
These include changes in:
- Mitochondrial quality
- Energy efficiency
- Fatty-acid oxidation
- Cellular stress
- Mitophagy signaling
If existing muscle fibers function more efficiently, performance may improve without needing large increases in:
muscle cross-sectional area.
Think “Muscle Quality,” Not “Muscle Size”
This is probably the most useful framework.
Urolithin A research currently fits better under:
muscle quality
than:
muscle quantity.
Muscle quality can include:
- Force production
- Fatigue resistance
- Mitochondrial efficiency
- Metabolic function
Muscle quantity refers more directly to:
how much muscle tissue you have.
Does Urolithin A Stimulate Muscle Protein Synthesis?
There is not strong human evidence showing that Urolithin A directly stimulates:
muscle protein synthesis
to the degree expected from:
- Resistance exercise
- Essential amino acids
- Leucine-rich protein
So UA should not be treated as a substitute for:
protein intake.
Does Urolithin A Contain Protein?
No.
Urolithin A does not provide:
- Protein
- Leucine
- Essential amino acids
Therefore it does not supply the raw materials required to synthesize:
new muscle protein.
Protein vs Urolithin A
They perform fundamentally different roles.
Protein
Provides:
building blocks.
Urolithin A
Is studied for:
mitochondrial and cellular quality-control pathways.
If muscle growth is the goal, adequate protein remains much more fundamental.
Resistance Training vs Urolithin A
Again, resistance training is the foundation.
Training produces:
mechanical tension
within muscle fibers.
This activates signaling that contributes to:
muscle protein synthesis and hypertrophy.
Urolithin A cannot reproduce that physical stimulus.
Can Urolithin A Help You Train Better?
Possibly.
This is more plausible than saying it directly builds muscle.
If UA improves:
- Muscle endurance
- Fatigue resistance
some people might theoretically perform more training work.
But whether that translates into:
greater long-term hypertrophy
has not been established.
Could Better Endurance Eventually Lead to More Muscle?
Theoretically.
If someone can perform:
- More repetitions
- More training volume
that could potentially increase training stimulus.
But this is an:
indirect hypothesis.
It has not been proven in long-term hypertrophy trials of Urolithin A.
Urolithin A vs Creatine for Muscle Growth
If your main goal is:
building muscle,
creatine currently has much stronger evidence.
Creatine combined with resistance training can improve:
- Strength
- Lean tissue mass
- Training capacity
UA currently has stronger mechanistic relevance to:
- Mitophagy
- Mitochondrial quality
- Muscle endurance
Read:
Urolithin A vs Creatine: Which Is Better for Muscle Aging?
Creatine Is More Established for Hypertrophy
Creatine has decades of research.
Meta-analyses in older adults show that:
creatine + resistance training
can produce greater improvements in:
- Lean tissue
- Strength
than resistance training alone.
UA does not currently have an equivalent hypertrophy evidence base.
Does Urolithin A Work Like Creatine?
No.
Creatine
Supports rapid ATP regeneration through:
phosphocreatine.
Urolithin A
Is studied around:
mitophagy and mitochondrial quality control.
Different mechanism.
Different evidence.
Different role.
Can You Take Urolithin A and Creatine Together?
There is no established major incompatibility.
The combination is biologically plausible because they target different pathways.
However:
There is not strong randomized human evidence proving that Urolithin A + creatine produces greater muscle growth than creatine alone.
Do not confuse:
different mechanisms
with:
proven synergy.
Urolithin A vs Protein Powder
If your goal is muscle growth:
protein is more fundamental.
Protein provides:
- Essential amino acids
- Leucine
- Nitrogen
required to build muscle tissue.
Urolithin A does not.
Is Urolithin A Better for People Over 50?
Its research becomes more interesting in aging populations.
Why?
Because older adults may experience changes in:
- Mitochondrial function
- Muscle endurance
- Muscle quality
UA has been directly studied in both:
- Middle-aged adults
- Older adults aged 65–90
Read:
Does Urolithin A Build Muscle After 50?
Not proven.
The current evidence supports more cautious language:
may support selected aspects of muscle function.
It does not establish:
increased muscle mass.
What About After 60?
The major older-adult study included people aged:
65–90.
The strongest finding involved:
muscle endurance.
Not muscle hypertrophy.
Read:
Can Urolithin A Prevent Age-Related Muscle Loss?
Not established.
Preventing age-related muscle loss depends strongly on:
- Resistance exercise
- Protein intake
- Overall nutrition
- Physical activity
UA should currently be viewed as:
adjunctive and emerging.
Does Urolithin A Prevent Sarcopenia?
No.
It has not been proven to:
- Prevent sarcopenia
- Treat sarcopenia
- Reverse sarcopenia
That requires much stronger clinical evidence.
What Is the Best Supplement for Building Muscle After 50?
There is no single supplement that replaces:
- Training
- Nutrition
But among commonly used supplements, creatine currently has one of the stronger evidence bases for:
- Strength
- Lean tissue
- Resistance-training support
UA is scientifically interesting.
But it belongs in a different evidence category.
Could Urolithin A Improve Muscle Recovery?
Human evidence specifically demonstrating faster:
post-exercise muscle recovery
is still limited.
Do not automatically infer improved recovery from:
- Mitochondrial biomarkers
- Reduced inflammatory markers
Those are related but not equivalent outcomes.
Does Urolithin A Reduce Muscle Soreness?
Not established.
Current human trials do not provide strong evidence that UA meaningfully reduces:
delayed-onset muscle soreness.
Does Urolithin A Increase Testosterone?
There is no convincing human evidence showing that Urolithin A meaningfully increases:
testosterone.
Its muscle effects should not be explained through a testosterone-boosting mechanism.
Does Urolithin A Increase Growth Hormone?
No strong evidence supports this.
UA should not be marketed as a:
growth-hormone booster.
Does Urolithin A Increase IGF-1?
There is no established clinically meaningful IGF-1-boosting effect that explains its human muscle findings.
Again, the stronger mechanism is:
mitochondrial quality control.
Does Urolithin A Increase Muscle Protein Synthesis Through mTOR?
Preclinical signaling research may involve pathways related to:
- AMPK
- mTOR
- Autophagy
But that does not establish UA as:
an mTOR-driven hypertrophy supplement in humans.
Mechanistic pathway involvement is not the same as:
proven muscle-building efficacy.
Can Urolithin A Help With Muscle Fatigue?
This is one of the more promising areas.
Older-adult and athlete studies have reported improvements in:
- Repetitions to fatigue
- Local muscle endurance
So if future research confirms these findings, UA may become more relevant as a:
fatigue-resistance support compound.
What Dose Has Been Studied?
Common research amounts include:
- 500 mg/day
- 1,000 mg/day
The athlete trial and aging trials used different protocols.
Research doses are not universal personal recommendations.
Read:
How Long Was Urolithin A Used?
Human trials commonly range from:
4 weeks to 4 months.
The resistance-trained athlete study lasted:
8 weeks.
The middle-aged and older-adult trials lasted:
4 months.
How Long Would It Take to Build Muscle?
This question should really be separated from UA.
Muscle hypertrophy develops through:
repeated training adaptation over time.
Meaningful changes usually require:
- Consistent resistance training
- Adequate protein
- Recovery
for:
weeks to months.
UA has not been shown to dramatically accelerate that process.
Can You Take Urolithin A Every Day?
Daily dosing has been used in human trials.
Short- and medium-term tolerability has generally been favorable.
Long-term multi-year data remain limited.
Read:
Can You Take Urolithin A Every Day?
Is Urolithin A Safe for Athletes?
Current short-term athlete data did not reveal a major obvious safety signal.
However, athlete-specific evidence remains:
small.
Competitive athletes should also independently verify supplement quality and sport-specific anti-doping requirements.
Urolithin A Muscle Evidence Scorecard
|
Outcome |
Current Evidence |
|---|---|
|
Muscle mass increase |
Not established |
|
Hypertrophy |
Not established |
|
Muscle strength |
Promising but limited |
|
Muscle endurance |
Promising |
|
Repetitions to failure |
Promising early evidence |
|
Maximal power |
Not consistently improved |
|
Walking performance |
Inconclusive |
|
Mitophagy |
Strong mechanistic evidence |
|
Mitochondrial biomarkers |
Promising human evidence |
|
Sarcopenia treatment |
Not established |
If Your Goal Is Muscle Growth, Prioritize These First
1. Progressive Resistance Training
The primary driver of muscle hypertrophy.
2. Adequate Protein
Provides amino acids for:
muscle protein synthesis.
3. Sufficient Calories
Consistently under-eating can make muscle gain difficult.
4. Sleep
Recovery matters.
5. Creatine
One of the best-supported supplements for:
- Strength
- Training performance
- Lean tissue
6. Emerging Compounds
This is where Urolithin A currently belongs.
Where Urolithin A Fits Best
Think of Urolithin A as potentially supporting:
the quality and endurance of muscle
rather than:
the quantity of muscle.
That is a much more accurate interpretation of current science.
Muscle Quantity vs Muscle Quality
|
Muscle Quantity |
Muscle Quality |
|
|---|---|---|
|
Muscle size |
Major factor |
Not required |
|
Hypertrophy |
Yes |
Not necessarily |
|
Strength |
Often related |
Yes |
|
Endurance |
Secondary |
Yes |
|
Mitochondrial function |
Secondary |
Important |
|
Urolithin A relevance |
Limited evidence |
More relevant |
This helps explain why someone might improve:
function
without noticeably increasing:
muscle size.
Should Bodybuilders Take Urolithin A?
Current evidence is not strong enough to call Urolithin A:
a bodybuilding supplement.
If a bodybuilder’s goal is maximum hypertrophy, higher-priority factors include:
- Training
- Protein
- Calories
- Creatine
- Recovery
UA may become interesting for:
- Mitochondrial health
- Training endurance
but this remains secondary.
Should Older Adults Take Urolithin A for Muscle?
The evidence is more relevant here.
Older adults are more likely to experience changes in:
- Muscle endurance
- Mitochondrial quality
- Physical function
UA has directly been tested in adults aged:
65–90.
Still, it should complement rather than replace:
- Exercise
- Protein
- Medical care
Does Urolithin A Reverse Muscle Aging?
No.
No human trial demonstrates that Urolithin A:
reverses biological muscle aging.
That would be much stronger than anything current evidence supports.
What the Evidence Supports
Current human evidence supports saying:
Urolithin A may support selected aspects of muscle strength, endurance and mitochondrial health.
It does not support saying:
Urolithin A builds muscle.
Those are not equivalent claims.
The Bottom Line
Does Urolithin A help build muscle?
Current human evidence says:
not directly—or at least not yet proven.
Urolithin A has produced promising findings involving:
- Muscle strength
- Muscle endurance
- Repetitions to fatigue
- Mitochondrial biomarkers
But clinical trials have not established a meaningful effect on:
muscle mass or hypertrophy.
The latest 2026 systematic review and meta-analysis includes only:
five randomized trials with 236 participants.
Researchers describe strength, endurance and mitochondrial findings as:
exploratory signals.
So if your goal is:
building bigger muscles,
the priorities remain:
resistance training
adequate protein
adequate energy intake
and:
creatine when appropriate.
Urolithin A fits better into the conversation around:
muscle quality, mitochondrial health and fatigue resistance.
That may eventually prove valuable for healthy aging.
But it is scientifically different from calling UA:
a muscle-building supplement.
Frequently Asked Questions
Does Urolithin A build muscle?
Human research has not established Urolithin A as a direct muscle-building or hypertrophy supplement.
Does Urolithin A increase muscle mass?
No convincing human evidence currently shows a significant increase in muscle mass.
Does Urolithin A improve strength?
Selected human trials have reported improvements in certain strength measures, but the overall evidence remains limited.
Does Urolithin A improve muscle endurance?
Yes, selected randomized trials have reported improved muscle endurance and fatigue resistance.
Does Urolithin A increase repetitions to failure?
One small randomized study in resistance-trained male athletes reported improved repetitions-to-failure performance.
Does Urolithin A increase bench press?
An eight-week athlete study found a numerical increase in bench-press 1RM, but the difference versus placebo was not statistically significant.
Does Urolithin A increase squat strength?
The same athlete study found no statistically significant improvement in squat 1RM compared with placebo.
Is Urolithin A good for bodybuilding?
It is not established as a bodybuilding or hypertrophy supplement. Evidence is more relevant to mitochondrial health, strength and endurance.
Is Urolithin A better than creatine for muscle growth?
No. Creatine currently has a substantially stronger evidence base for strength and lean tissue gains.
Can Urolithin A and creatine be taken together?
There is no established major incompatibility, but strong clinical evidence proving synergy is lacking.
Does Urolithin A replace protein?
No. UA does not contain essential amino acids and cannot replace dietary protein.
Does Urolithin A stimulate muscle protein synthesis?
Strong human evidence demonstrating a clinically meaningful muscle-protein-synthesis effect is lacking.
Does Urolithin A increase testosterone?
No convincing human evidence shows a meaningful testosterone-boosting effect.
Does Urolithin A increase growth hormone?
No established human evidence supports that claim.
Is Urolithin A useful after 50?
It may be relevant for muscle endurance, mitochondrial health and healthy aging, but resistance training and adequate protein remain more important.
Is Urolithin A useful after 60?
It has been studied directly in adults aged 65–90, with promising findings for selected muscle-endurance outcomes.
Can Urolithin A prevent sarcopenia?
No. It has not been established as a prevention or treatment for sarcopenia.
Related Celnovix Guides
- Urolithin A and Muscle Health
- Urolithin A vs Creatine
- Creatine for Healthy Muscle Aging
- How to Maintain Muscle Mass After 50
- Urolithin A After 50
- Urolithin A After 60
- Urolithin A and Mitophagy
- What Is Urolithin A?
- Urolithin A Benefits
- Urolithin A Dosage Guide
- How Long Does Urolithin A Take to Work?
- Urolithin A Side Effects
References
Singh A, et al.
Urolithin A Improves Muscle Strength, Exercise Performance, and Biomarkers of Mitochondrial Health in a Randomized Trial in Middle-Aged Adults
This randomized controlled trial included:
88 untrained, overweight middle-aged adults.
Participants received:
- Placebo
- 500 mg/day Urolithin A
- 1,000 mg/day Urolithin A
for four months.
Selected leg-strength outcomes improved by approximately:
12%.
However, the study’s primary endpoint involving:
peak power output
did not significantly improve.
Several authors were employees, board members or scientific advisors of Amazentis, the study sponsor.
Liu S, et al.
Effect of Urolithin A Supplementation on Muscle Endurance and Mitochondrial Health in Older Adults: A Randomized Clinical Trial
This randomized clinical trial included:
66 adults aged 65–90 years.
Participants received:
1,000 mg Urolithin A daily
or placebo for:
four months.
Selected hand and leg muscle-endurance measures improved.
However:
- Six-minute walking distance
- Maximal mitochondrial ATP production
did not significantly improve versus placebo.
Dao T, et al.
Effects of Urolithin A Supplementation on Muscle Health Outcomes in Humans From Randomized Controlled Trials
Published in 2026, this systematic review and meta-analysis included:
5 randomized controlled trials
and:
236 participants.
The pooled six-minute walking result favored Urolithin A but was not statistically significant.
Strength, endurance, aerobic and mitochondrial outcomes were heterogeneous and described as:
exploratory signals rather than reproducible effects.
Hodzic Kuerec A, et al.
Targeting Aging With Urolithin A in Humans: A Systematic Review
This systematic review included:
five human studies
and approximately:
250 healthy individuals.
UA supplementation was associated with changes in:
- Selected muscle strength measures
- Endurance
- Mitochondrial genes
- Autophagy markers
- Fatty-acid oxidation
But the review did not find consistent effects on:
- Anthropometric outcomes
- Overall physical function
- Maximal mitochondrial ATP production
Resistance-Trained Athlete Trial
Assessment of Urolithin A Effects on Muscle Endurance, Strength, Inflammation, Oxidative Stress, and Protein Metabolism in Male Athletes With Resistance Training
This eight-week randomized, double-blind, placebo-controlled study evaluated Urolithin A in:
resistance-trained male athletes.
Compared with placebo:
- Bench-press 1RM did not significantly improve
- Squat 1RM did not significantly improve
- Maximum voluntary isometric contraction improved
- Repetitions to failure improved
The findings are interesting but require replication in larger athlete populations.
Evidence Transparency
Current limitations include:
- Only a small number of randomized UA muscle trials exist.
- Sample sizes remain small.
- Trial durations are generally short.
- Study populations differ substantially.
- Muscle-mass outcomes are underrepresented.
- Several major UA studies have industry involvement.
- Positive secondary outcomes sometimes occur despite non-significant primary outcomes.
- Athlete evidence remains especially limited.
For these reasons, Celnovix does not classify Urolithin A as a proven:
muscle-building supplement.
Editorial Standards
Celnovix distinguishes between:
- Muscle mass
- Muscle hypertrophy
- Muscle strength
- Muscle endurance
- Muscle power
- Mitochondrial biomarkers
These are separate outcomes.
We do not interpret:
- Improved endurance as proof of hypertrophy
- Improved strength as proof of increased muscle mass
- Mitophagy as proof of muscle growth
- Molecular target engagement as proof of clinical effectiveness
- One small athlete trial as definitive sports-performance evidence
Medical Disclaimer
This article is provided for general educational and informational purposes only and does not constitute medical advice, diagnosis, treatment or individualized supplement guidance.
Urolithin A is not established as a treatment for sarcopenia, muscle-wasting disorders or other medical conditions.
If you are experiencing rapid muscle loss, unexplained weakness, unexplained weight loss or significant reductions in physical function, seek evaluation from an appropriately qualified healthcare professional.
