Taurine

Amino acid whose blood levels decline with age and supplementation extends lifespan in animals

Taurine is a sulfur-containing amino acid abundant in heart, skeletal muscle, and brain tissue. A landmark 2023 study in Science found that taurine levels decline significantly with age across multiple species, and that taurine supplementation extended healthy lifespan in mice and improved multiple health markers in middle-aged rhesus monkeys.