Feeling Weaker With Age? Support Strength as You Get Older
The jar of pasta sauce that will not open. The suitcase that feels heavier than it used to. The flight of stairs that leaves your legs a little more tired than you remember. If you have caught yourself thinking ‘I am just not as strong as I used to be,’ you are noticing something real and very common. This guide explains what actually changes in muscle as we age, and where urolithin A fits as a way to support muscle and cellular energy.
Why strength quietly declines with age
Starting somewhere in our thirties, most adults gradually lose muscle mass and strength. The commonly cited figures are a loss of roughly three to eight percent of muscle mass per decade, with the pace often picking up after about age sixty. Researchers call the age-related loss of muscle mass and function sarcopenia. It rarely announces itself. Instead it shows up as the small frustrations above, or as needing to plant a hand on the armrest to stand.
Several things drive this. We tend to move less and lift less as life gets busier, and muscle follows a strict use-it-or-lose-it rule. Protein is used less efficiently by aging muscle. Hormonal shifts play a role. And at the cellular level, the tiny power plants inside muscle cells, called mitochondria, become less efficient and are recycled more slowly over time. That last piece, mitochondrial quality, is where a compound called urolithin A has drawn scientific interest.
None of this means decline is inevitable at a fixed rate. Resistance training, adequate protein, and sleep remain the most established levers for maintaining strength as you age, and nothing here replaces them. What follows is where a specific, well-studied ingredient may offer supportive value alongside those basics.
What urolithin A is, in plain terms
Urolithin A is not something you eat directly. It is a postbiotic: your gut bacteria produce it from compounds called ellagitannins, which are found in pomegranates, walnuts, and certain berries. Here is the catch that surprised researchers: only some people carry the gut microbes needed to make meaningful amounts. Estimates suggest a large share of adults convert very little, no matter how much pomegranate they eat. That variability is a big reason a standardized supplement became interesting, because it delivers a consistent dose rather than leaving it to the lottery of your microbiome.
The mechanism that has scientists paying attention is mitophagy, the cellular housekeeping process that identifies worn-out mitochondria and recycles them so fresher, more efficient ones can take their place. Muscle is dense with mitochondria, so it is a logical tissue to study. If you want the deeper background, our complete urolithin A guide and our overview of mitochondrial health walk through the biology step by step.
The human evidence, from strongest to newest
Established human trials
The first-in-human work came from Andreux and colleagues, published in Nature Metabolism in 2019. It established that urolithin A was safe and well tolerated in healthy older adults at doses up to 1,000 mg per day, and it produced a measurable shift in a mitochondrial gene-expression signature. In other words, at the cellular level the compound did something consistent with its proposed mechanism, and it did so without notable safety concerns.
Two randomized human trials then looked at muscle outcomes. Liu, D’Amico and colleagues, publishing in JAMA Network Open in 2022, studied older adults over roughly four months and reported effects on muscle endurance. Singh and colleagues, in Cell Reports Medicine that same year, tested 500 mg and 1,000 mg daily in middle-aged adults over four months and reported benefits for muscle strength and aspects of exercise performance. These are the trials most directly relevant to a person who feels their strength slipping, and they are human, randomized, and peer-reviewed.
Newer human research
More recent work has broadened the picture. An 8-week randomized controlled trial in resistance-trained men, published in the Journal of the International Society of Sports Nutrition in 2024, examined urolithin A alongside training. A 2025 trial in distance runners added data in an endurance-athlete population. And a 2025 randomized controlled trial in Nature Aging, running about 28 days, reported that urolithin A supported the mitochondrial health of immune cells in midlife adults, part of a research theme sometimes called inflammaging. These studies are encouraging and expand the range of people studied, though several are short or in specific groups.
Preclinical and mechanistic work
The foundational laboratory research is worth naming honestly as preclinical. Ryu and colleagues, in Nature Medicine in 2016, showed that urolithin A induced mitophagy, extended lifespan in the worm C. elegans, and improved muscle measures in rodents. This animal and cell work is what motivated the human trials, but findings in worms and mice do not automatically translate to people, and should not be read as proof of a human benefit.
An honest read on the limitations
A 2024 systematic review in Ageing Research Reviews, focused on targeting aging with urolithin A in humans, reached a measured conclusion: the human evidence is still emerging. Trials so far are relatively small and short, effect sizes are modest, and urolithin A is a supportive ingredient, not a substitute for training and nutrition. It supports the cellular machinery behind muscle function; it does not build muscle on its own while you sit still. Set expectations accordingly, and treat it as one input among the fundamentals.
How to actually use it
The clinically studied range is 500 to 1,000 mg per day, with 1,000 mg at the top end. Consistency matters more than timing, because mitophagy is a slow, cumulative process rather than a same-day stimulant effect. Most people take it daily for a sustained period and pair it with resistance exercise and adequate protein. For specifics, see our pages on urolithin A dosage and how long urolithin A takes to work. If you are comparing formats, our roundup of the best urolithin A gummies lays out what to look for.
A note on when to see a doctor: feeling weaker is usually a normal part of aging, but noticeable, rapid, or one-sided weakness, unexplained weight loss, frequent falls, or muscle loss that worries you deserve a medical evaluation. Urolithin A is not a treatment for sarcopenia or any medical condition, and this guide is not a diagnosis. Talk with your healthcare provider about persistent symptoms and before starting any supplement, especially if you are pregnant, nursing, or taking medication.
Frequently asked questions
Is feeling weaker with age normal?
Gradual strength decline is common from our thirties onward and tends to accelerate later in life. That said, sudden, severe, or one-sided weakness is not routine aging and should be checked by a healthcare provider.
Can urolithin A make me stronger?
Human trials have reported support for muscle strength and endurance, but urolithin A is a supportive ingredient, not a replacement for resistance training and protein. It supports the cellular energy machinery within muscle rather than building muscle on its own.
Why can't I just eat pomegranates instead?
Your gut bacteria have to convert ellagitannins from those foods into urolithin A, and many people produce very little regardless of intake. A standardized supplement delivers a consistent dose.
How much should I take?
Human studies used 500 to 1,000 mg per day, with 1,000 mg at the top of the range. SOMA HEALTH Urolithin A Gummies provide 1,000 mg in a 4-gummy daily serving. See our dosage guide for details.
How long before I might notice anything?
Mitophagy is a slow, cumulative process, so the human trials ran for weeks to months. Consistency matters more than any single dose or timing.
Is it safe?
The first-in-human study reported urolithin A was safe and well tolerated at up to 1,000 mg per day. As with any supplement, check with your healthcare provider first, particularly if you take medication or have a health condition.
Support your strength with SOMA HEALTH Urolithin A
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This guide is educational and is not a substitute for advice from a qualified healthcare provider.
A clinically studied 1,000 mg dose of Urolithin A in one simple daily gummy — to support mitophagy, muscle strength, and cellular energy.
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