Taurine's Anti-Aging Promise, Put to the Test in 1,394 People
In 2023, a paper in Science ignited one of the supplement industry’s biggest trends. An international research team showed that taurine levels declined with age in mice, worms, and monkeys—and that supplementing taurine extended healthy lifespan across these species by 10 to 12%. The implication for human aging was obvious, and taurine supplement sales surged.
Two years later, a human study involving 1,394 people has substantially complicated that story.
What the Human Data Shows
The 2025 study, published in Science, measured plasma taurine concentrations across a broad adult age range. Unlike in the animal models, taurine levels in humans showed no consistent pattern of age-related decline. In some older participants, taurine levels were unchanged or even elevated compared to younger adults.
Rafael de Cabo, a gerontologist at the National Institute on Aging (NIA), commented on the findings: “We clearly show that there’s no need for taurine supplementation as long as you have a healthy diet.” The NIH followed with a formal statement concluding that taurine is unlikely to serve as a reliable biomarker of human aging.
The Counter-Argument
Vijay Yadav, the Rutgers associate professor who co-authored the original 2023 study, maintains that the 2025 data doesn’t close the question. Animal studies demonstrating taurine’s effects on aging markers remain valid, and whether supplemental taurine—as opposed to endogenous levels—can alter the aging trajectory in humans requires a different kind of evidence: a prospective clinical trial.
That trial is underway. Yadav’s team is currently running a human clinical study on middle-aged adults, measuring whether daily taurine supplementation changes the pace of aging as measured by biological age clocks.
Taurine in Food, and Who May Actually Be Deficient
Taurine is abundant in fish, shellfish, meat, and eggs. It’s not present in plant foods, which means strict long-term vegans may have measurably lower circulating levels than omnivores. Certain conditions affecting bile acid metabolism or kidney function can also reduce taurine availability. For those in these categories, supplementation has a clearer rationale than for the general public.
The supplement industry’s positioning of taurine as a universal longevity accelerant is ahead of the available human evidence. This doesn’t mean the animal findings were wrong—it means translating animal longevity data to human supplementation recommendations requires clinical confirmation that doesn’t yet exist.
The trial results, when available, will determine whether taurine joins the small list of longevity compounds with genuine human data, or remains a well-studied animal finding that didn’t replicate.
Sources
Nature - Anti-ageing effects of popular supplement taurine challenged