Feeling Older Than Your Age? Support Cellular Vitality

Reviewed by SOMA HEALTH's Medical Research Team

Feeling older than the number on your birth certificate is a common and legitimate experience. When stairs feel steeper, recovery takes longer, and your usual afternoon feels heavier than it used to, it is natural to wonder what is happening beneath the surface. Much of that everyday vitality traces back to the tiny power plants inside your cells - and there are sensible, evidence-first ways to think about supporting them.

What people usually mean by 'feeling older'

The phrase covers a lot of ground: less spring in your step, muscles that fatigue sooner, slower bounce-back after a hard day, and a general sense that your body is not quite keeping pace with your intentions. These sensations are real, but they are not a diagnosis. They are influenced by sleep, stress, nutrition, physical activity, hydration, and dozens of other factors that shift across a lifetime. Before assuming the worst, it is worth remembering how much of daily vitality is modifiable through ordinary habits.

Underneath many of these feelings sits a single theme that researchers keep returning to: the health of your mitochondria, the structures inside nearly every cell that convert food and oxygen into usable energy. When mitochondria work efficiently, tissues that demand a lot of fuel - muscles, heart, brain - tend to perform closer to their potential.

Mitochondria and the biology of 'slowing down'

Mitochondria are not permanent. Cells constantly build new ones and clear out worn, underperforming ones through a quality-control process called mitophagy - essentially recycling old cellular machinery so fresher, more efficient units can take over. You can read a plain-language explainer of this process in our guide to what mitophagy is, and a broader overview in our mitochondrial health resource.

Research in humans has linked reduced mitochondrial oxidative capacity to age-related muscle changes, and studies of muscle aging have reported lower mitochondrial energy output and related metabolic shifts. This does not mean feeling older is 'all mitochondria,' but it helps explain why so much longevity research focuses on keeping these energy factories in good working order. The natural pace of mitophagy is thought to slow over time, which is one reason scientists have looked for compounds that engage this recycling pathway.

Where urolithin A fits in

Urolithin A (UA) is a compound your gut bacteria can produce when you eat ellagitannins - the polyphenols found in pomegranates, walnuts, and certain berries. Importantly, only some people carry the gut microbes needed to make meaningful amounts of it, which is part of why interest in supplemental UA has grown. You can explore dietary sources in our guide to foods high in urolithin A. In laboratory research, UA is studied for its ability to support mitophagy - the same recycling process described above.

Proven in humans: safety and mitochondrial signals

The most established human evidence comes from a first-in-human trial published by Andreux and colleagues in Nature Metabolism in 2019. It reported that UA was safe and well tolerated at doses up to 1,000 mg per day, and that it produced a mitochondrial gene-expression signature in participants - an early, measurable sign that the compound was engaging mitochondria-related pathways. This established the safety foundation that later studies built upon.

Newer human research: muscle and cellular function

Several controlled human trials have since examined function rather than just biomarkers. A 2022 randomized study by Liu, D'Amico and colleagues in JAMA Network Open followed older adults for roughly four months and reported improvements in aspects of muscle endurance. In the same year, Singh and colleagues published a trial in Cell Reports Medicine in middle-aged adults over four months, using 500 mg and 1,000 mg daily arms, and reported effects on muscle strength and exercise performance. A 2024 randomized controlled trial in the Journal of the International Society of Sports Nutrition looked at resistance-trained men over eight weeks, and a 2025 trial studied distance runners. Most recently, a 2025 randomized controlled trial in Nature Aging followed midlife adults for about 28 days and reported support for immune-cell mitochondrial health in the context of inflammaging - the low-grade inflammation associated with aging.

These are genuinely encouraging findings, but honesty matters. A 2024 systematic review in Ageing Research Reviews, focused on targeting aging with urolithin A in humans, concluded that the evidence is still emerging. Trials so far are relatively short, sample sizes are modest, and effects are best described as supporting normal function rather than transforming it. UA is not a shortcut around exercise, sleep, or a sensible diet.

Preclinical research: promising but early

Much of the excitement around UA began with animal and cell studies, which should be read as hypothesis-generating rather than proof of human benefit. In a landmark 2016 study in Nature Medicine, Ryu and colleagues reported that UA induced mitophagy, extended lifespan in the roundworm C. elegans, and improved muscle measures in rodents. A separate 2022 study in Aging Cell by D'Amico and colleagues examined joint and cartilage outcomes in osteoarthritis models. Other tissues frequently mentioned in coverage - skin, gut, brain, and heart - remain areas where early, preclinical research is exploring possible roles, without established human proof. Treat any claim beyond muscle and mitochondrial function as preliminary.

Practical, honest guidance

If you feel older than your age, start with the fundamentals that have the strongest evidence: regular movement including some resistance training, adequate protein, consistent sleep, and stress management. These do more for everyday vitality than any single supplement. Feeling persistently older, more fatigued, or weaker than expected can also have medical causes - from thyroid and iron issues to sleep disorders - so this guide is not a treatment, and unexplained or worsening symptoms deserve a conversation with your doctor.

Within that context, UA is one option some people choose to support cellular and mitochondrial health. Human trials have used 500 to 1,000 mg per day, with 1,000 mg at the top of the studied range. For more on dosing, see our urolithin A dosage guide, and for a full overview, our urolithin A guide and comparison of the best urolithin A gummies.

*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.