Topical urolithin A improves mitochondria in aging skin
Urolithin A is a compound produced by gut bacteria from foods like pomegranate. It is already known as a supplement for muscles and energy. Now new research shows it can also be applied to the skin, with measurable effects on aging skin cells.
Researchers tested a cream containing urolithin A on people with aged skin. The compound activated a process in skin cells that removes and replaces damaged mitochondria (the cell’s energy generators). This process is called mitophagy: the targeted breakdown of faulty mitochondria. The researchers observed subsequent improvements in skin cell function.
Mitochondria and skin aging
Aging skin contains more damaged mitochondria. These produce less energy and generate more harmful byproducts. Skin cells running low on energy produce less collagen and elastin. They also repair more slowly after damage from sunlight or other stressors.
By breaking down and replacing damaged mitochondria, cells can function better. Urolithin A appears to accelerate that process. After treatment, skin showed fewer signs of aging such as wrinkles and reduced elasticity. The researchers draw cautious conclusions, as this was a limited study.
Comparison with topical rapamycin
The article’s authors compare this with earlier research into low-dose rapamycin applied to the skin, a compound that also works via mitophagy. Both approaches appear to share the same mechanism: improved clearance of damaged mitochondria reduces the number of cells entering a senescent (aged, dysfunctional) state. A direct head-to-head comparison of the two compounds has not yet been done.
Urolithin A is already available as a supplement and skincare ingredient. But the scientific evidence for topical application remains limited. Larger studies are needed to confirm these findings.
Search terms for further reading: urolithin A mitophagy skin, mitochondrial dysfunction skin aging, cellular senescence skin repair