Molecule
Urolithin A
A metabolite the gut makes from pomegranate ellagitannins, when it can. About 40% of people can't. That's why it's now sold pre-formed.
Summary Can urolithin A improve muscle health or slow aging? Show / hide ↓
Urolithin A is a substance made by gut bacteria from foods such as pomegranates, walnuts, and berries. About 40% of adults cannot make it, so eating these foods may not raise their levels much. It may support mitophagy, the cell’s process for clearing out damaged mitochondria, which are the parts that help cells produce energy. Human studies found modest improvements in muscle endurance and strength in older adults, along with changes in muscle cell activity, and this effect has been seen in more than one study. It costs about $2–3 per day, and it is not yet known whether it slows aging or extends life.
What this means for you: Urolithin A has better human evidence than most similar plant-based products, but the benefits seen so far are modest. It may help muscle function, but there is not enough evidence that it changes aging itself.
moderate evidenceUrolithin A is what your gut microbes make out of pomegranates, walnuts, and berries, if you have the right microbes. Around 40% of adults do not carry the microbial capacity to produce it, and dietary intake of the precursors alone gives them little to no urolithin A in blood.
The longevity relevance is mitophagy, the cellular process of recycling damaged mitochondria. Urolithin A is one of the few compounds where mitophagy induction has been documented in human muscle biopsies (not just cell culture). This matters because mitochondrial dysfunction is one of the more mechanistically clear hallmarks of aging.
Amazentis (the Swiss biotech that developed the commercial product Mitopure) has run several RCTs. Findings: modest but replicated improvements in muscle endurance and strength in older adults, changes in mitochondrial gene expression, no serious safety signals. Effect sizes are moderate, not transformative.
Urolithin A is expensive. The proprietary Mitopure is around $2-3/day. Third-party urolithin A is now available and cheaper but with less verified purity.
Whether urolithin A meaningfully alters aging endpoints in humans is not yet established. It has cleaner mechanistic evidence than most polyphenol-related products and cleaner human data than most sirtuin-related products. That is where it sits: a modest but real biological signal, at a not-yet-transformative effect size, with better science than most competitors.
Products with this: Urolithin A
Further reading
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