What it means
Taurine is a sulfur-containing amino acid — technically an amino sulfonic acid — abundant in muscle, heart, brain and retina. The body makes it from cysteine and gets it from meat, fish and dairy; vegans have lower levels. It regulates cell volume, bile-acid conjugation, calcium signalling and mitochondrial function, and acts as an antioxidant.
Blood taurine falls by around 80% between early adulthood and old age in humans, monkeys and mice, which is the observation that prompted the lifespan study.
Why it matters for longevity
A nutrient that declines steeply with age and whose replacement extends animal lifespan is exactly the profile longevity research looks for. Taurine is also cheap, safe at gram doses and already in the food supply, which makes it a strong candidate for a human trial.
What the evidence says
Singh 2023 (Science): taurine supplementation in middle-aged mice extended median lifespan by 10–12%, improved bone, muscle, glucose handling and immune markers, and reduced senescent-cell markers. In middle-aged rhesus monkeys, six months of taurine improved bone density, glucose and inflammation. In 12,000 humans in the EPIC-Norfolk cohort, lower taurine was associated with obesity, diabetes and inflammation. A single bout of exercise raised blood taurine.
No human longevity trial exists. Earlier small trials in heart failure and type 2 diabetes (1.5–6 g/day) show modest improvements in exercise capacity and glucose; meta-analyses report small blood-pressure reductions.
How to measure or use it
- Plasma taurine can be measured but reference ranges for "optimal" do not exist.
- Trial doses in humans are 1.5–6 g/day; the mouse dose scaled to humans is roughly 3–6 g. Side effects at these doses are rare.
- The accessible endpoints are the metabolic ones: HbA1c, hs-CRP, blood pressure, and VO2max over three months.
Related
- Supplements that have evidence — where taurine ranks after 2023
- Metabolic health — the markers it is studied for
- Mitochondria and energy — the mitochondrial mechanism
Frequently asked questions
Does taurine extend human life?
Unknown. The lifespan data are in mice; in humans there is a correlation between low taurine and poorer metabolic health, which may run either way.
How much taurine was used in the mouse study?
About 1 g per kg of body weight, which scales to roughly 3–6 g per day for an adult human; human trials have used 1.5–6 g safely.
Is the taurine in energy drinks the same?
Yes, chemically; a can contains about 1 g. The caffeine and sugar are the problem, not the taurine.
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