Heart and longevity

Every heart and longevity claim we've checked against the studies, newest first.

A woman in her mid sixties with short gray hair, in a teal linen shirt, sits at a sunny wooden kitchen table with her hands clasped, a glass of pomegranate juice, half a pomegranate and a phone in front of her, looking out the window.

Sep 29, 2026 · Grade: Unproven

Urolithin A helped stiff hearts in mice. In people, the evidence is for muscle

A 2026 King's College London study found urolithin A improved heart relaxation in mice with stiff-heart failure and in lab-grown human heart tissue, but it hasn't been tried in patients. In people, small industry-funded trials show better muscle endurance and strength, not better walking, and your gut bacteria decide how much you make from pomegranates.