Recharging Aging Immune Cells

Health Notes 033026

Here is one of our latest natural health and nutrition findings:

Urolithin A recharges aging immune cells and boosts mitochondrial fitness in midlife adults

Frankfurt Cancer Institute (Germany), Nov 3 2025 (News-Medical)

In a recent study published in Nature Aging, researchers evaluated whether oral Urolithin A (UA), a mitophagy-inducing postbiotic, can remodel immune cell phenotypes and metabolism in healthy middle-aged adults compared with placebo.

By age 50, many people notice slower recovery and lingering infections, signs of immune aging. This process involves a decline in naïve T cells and persistent low-grade inflammation (”inflammaging”). Mitochondria, the body’s primary energy generators, and mitophagy, their quality control process, play key roles in maintaining immune balance. When mitophagy falters, immune cells lean toward exhaustion and inflammation.

The trial was randomized, double-blind, and placebo-controlled, enrolling 50 healthy adults aged 45–70 years. Participants received either 1,000 mg of oral Urolithin A daily or placebo for 28 days. Assessments occurred at baseline, day 7, and day 28.

UA supplementation reshaped the CD8⁺ T-cell profile toward a “ready-to-respond” state. Compared with placebo, UA increased naïve-like CD8⁺ T cells and Ki-67 expression (linked to proliferation and reinvigoration) while reducing TOX, a transcription factor associated with exhaustion. PD-1 expression was unchanged, and CD4⁺ subsets remained stable, indicating selective CD8⁺ rejuvenation without global activation.

SCENITH analysis revealed that UA reduced glucose dependence and enhanced fatty acid and amino acid oxidation in CD8⁺ T cells, particularly in naïve cells, thereby favoring a durable, oxidative energy profile. NK cells displayed similar metabolic gains, while monocytes stayed glycolytic and CD4⁺ T cells were largely unchanged.

Conclusions: In healthy middle-aged adults, a 28-day UA regimen shifted CD8⁺ T cells toward a youthful, less exhausted phenotype, reprogrammed metabolism toward mitochondrial oxidation, expanded beneficial NK subsets, and enhanced monocyte bacterial clearance.

About Gary Null

An internationally renowned expert in the field of health and nutrition, Gary Null, Ph.D is the author of over 70 best-selling books on healthy living and the director of over 100 critically acclaimed full-feature documentary films on natural health, self-empowerment and the environment. He is the host of ‘The Progressive Commentary Hour” and “The Gary Null Show”, the country’s longest running nationally syndicated health radio talk show which can be heard daily on here on the Progressive Radio Network.

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