Oxford Healthspan

Oxford Healthspan is the cutting-edge longevity brand behind Primeadine®, a clinically backed, food-derived spermidine supplement designed to activate cellular renewal from the inside out. Based on decades of research into autophagy (cell renewal), mitochondrial health, and immune aging, Primeadine® helps restore levels of spermidine—an essential polyamine that declines with age and plays a key role in slowing aging at the cellular level. These supplements are rooted in Oxford science and sourced from Japan’s longevity islands, using only food-grade ingredients with no synthetic additives. These formulas meet the highest standards of purity, efficacy, and bioavailability. They are trusted by physicians, wellness experts, and longevity enthusiasts alike. Primeadine® is available in three powerful formulations: Primeadine® Original capsules (made with defatted Japanese wheat germ and prebiotic fiber), Primeadine® GF (a first-of-its-kind gluten free version with Okinawan chlorella, citrus peel, and turmeric), and Primeadine® Original Powder (a flexible, concentrated version, ideal for blending into food, smoothies, or drinks). The company was founded by Leslie Kenny, a Harvard-educated entrepreneur and Oxford-based longevity expert. After being diagnosed with multiple autoimmune conditions in her late 30s and told she couldn’t have children, Leslie reversed her symptoms through immune system modulation and lifestyle changes—and conceived naturally at 43. Now 60 years old with a biological age of just 21, she is on a mission to help others improve their healthspan. Oxford Healthspan brings that mission to life through scientifically grounded products that support deeper sleep, cognitive clarity, gut health, immune resilience, and radiant aging.