December 30, 2025, 10:02 am | Read time: 2 minutes
Research has been increasingly interested in Urolithin A for some time. It is a so-called postbiotic that our gut bacteria produce from plant compounds such as the ellagitannins found in pomegranates. It is particularly intriguing to scientists because it can improve the health of mitochondria and, consequently, many other bodily functions. A study examined whether Urolithin A also benefits the immune system. The results are promising but should be approached with caution, as the manufacturer was involved in the study.
What was investigated? The international research team specifically wanted to know if the compound could enhance immune function in middle age.1 The placebo-controlled, double-blind study involved 50 healthy adults aged 45 to 70. They received 1,000 milligrams of Urolithin A or a placebo daily for four weeks. The study aimed to measure changes in specific immune cells and their energy utilization in the blood. Researchers also measured how the compound affects mitochondrial renewal.
Urolithin A Appears to Enhance Immune Cell Performance
Results: After four weeks of taking Urolithin A, participants showed an increase in young immune cells, known as naive CD8-positive T cells. These cells are important because they can flexibly respond to new pathogens. At the same time, they appeared less exhausted and utilized their energy more from fats and amino acids, indicating better functionality.
Additionally, the number of natural killer cells increased. These cells recognize altered or infected body cells and can eliminate them directly. A form of monocytes that circulates in the blood and responds early to pathogens was also more prevalent.
Another group of monocytes, which typically produces many pro-inflammatory substances, showed a calmer, less inflammatory activity pattern. This suggests a more balanced immune response.
When the immune cells were specifically stimulated, the T cells produced the messenger substance TNF more quickly, an important signal for an effective immune response. Additionally, the monocytes’ ability to actively ingest and neutralize bacteria improved.
Significance: These results suggest that Urolithin A can temporarily enhance the immune defense in middle-aged individuals. The compound positively influences both the composition of immune cells and their energy balance. The study was partially funded by a company that manufactures and sells Urolithin A. Moreover, it was a small pilot study that examined short-term effects. Whether these effects are confirmed long-term and translate into health benefits must be tested in independent follow-up studies.
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