A landmark 2023 study in Science found that taurine deficiency drives aging across species, and supplementation extended healthy lifespan in mice and worms.
In June 2023, a paper published in Science — one of the two most prestigious scientific journals in the world — sent ripples through the longevity community. The study, led by Vijay Yadav at Columbia University, proposed that declining levels of a single amino acid called taurine may be a direct driver of the aging process across multiple species. This is a bold claim, but it rests on a remarkably thorough body of experimental evidence that spans worms, mice, and humans.
Taurine (2-aminoethanesulfonic acid) is a conditionally essential amino acid found abundantly in the brain, heart, eyes, and skeletal muscle. Unlike most amino acids, taurine is not incorporated into proteins; instead it acts as a free amino acid with a range of cellular functions. It regulates osmosis, modulates calcium signalling, suppresses inflammation, acts as an antioxidant, and stabilises cell membranes. Taurine is synthesised endogenously from methionine and cysteine, but production capacity declines with age. It is also obtained from the diet — meat, fish, and dairy are rich sources, which is why vegans often have lower plasma taurine levels.
Despite its importance, taurine has historically been viewed primarily as a component of energy drinks rather than a serious longevity candidate. The 2023 Science paper changed that perception overnight. Energy drink manufacturers had included taurine largely because of its role in muscle function and neurological signalling, without necessarily appreciating the depth of its involvement in the aging process. The research by Yadav and colleagues reframed taurine as something far more fundamental.
Yadav and colleagues made several interconnected observations that, taken together, build a compelling case:
1. Taurine levels decline with age across species. The team measured taurine in blood from humans aged 5-80, as well as in mice and non-human primates (rhesus monkeys) at various ages. In all three species, blood taurine declined substantially with age — roughly 80% lower in older humans compared to young adults. This is a striking convergence across distantly related species that strongly suggests taurine decline is an evolutionarily conserved feature of aging biology, not a coincidence.