The postbiotic compound Urolithin revitalizes the aging human immune system and can reverse key signs of age-related immune decline https://www.nature.com/articles/s43587-025-01012-y Effect of the mitophagy inducer urolithin A on age-related immune decline: a randomized, placebo-controlled trial https://www.nature.com/articles/s43587-025-00996-x Urolithin A supplementation remodels immune cell metabolism