Taurine and Heart Health: Emerging Evidence

Taurine is an amino sulfonic acid found in high concentrations in the heart, skeletal muscle, brain, and retina. Unlike most amino acids, it is not built into proteins but works as a free molecule in bile acid conjugation, calcium signaling, antioxidant defense, and cell volume regulation. Adults make some taurine from cysteine and methionine, but most circulating taurine comes from food — meat and seafood — so vegans and strict vegetarians tend to run lower blood levels.

The 2023 Science Landmark Study

Singh et al. 2023 (PMID 37289866), published in Science (not Nature Aging, as is sometimes reported), measured taurine across the human lifespan and found about an 80% drop between young adulthood and old age, with similar declines in mice and monkeys. In mice, taurine supplementation extended median lifespan by roughly 10–12% and improved several markers of biological aging — bone density, muscle function, immune cell composition, and DNA damage. The human observational arm showed lower taurine correlated with multiple age-related diseases. The authors emphasized that randomized clinical trials are needed before drawing causal conclusions in humans.

Cardiovascular Evidence

The cardiovascular evidence for taurine pre-dates the 2023 lifespan paper and is more solid. Waldron et al. 2018 (Curr Hypertens Rep, PMID 30006901), a meta-analysis of 7 RCTs in 103 participants, found taurine at doses of 1–6 g/day for periods ranging from 1 day to 12 weeks reduced both systolic and diastolic blood pressure by approximately 3 mmHg on average (range 0–15 mmHg systolic, 0–7 mmHg diastolic), with no adverse events reported. A Japanese epidemiological study (Yamori 2010, J Biomed Sci) found inverse associations between dietary taurine intake and cardiovascular mortality, which has been cited as one of several explanations for Japan's relatively low rate of coronary disease.

Safety and Considerations

Taurine has a strong safety profile. The European Food Safety Authority's 2009 opinion on taurine in energy drinks concluded that exposure to taurine at the doses found in those products (around 0.06 g/kg body weight per day, or about 4 g/day for a 70-kg adult) was unlikely to raise safety concerns. EFSA's earlier Scientific Committee on Food set a no-observed-adverse-effect level of 1,000 mg/kg/day in animal studies. Energy drinks contain taurine at about 1–2 g per can — their stimulant effects are from caffeine, not taurine. At 1–3 g/day, taurine is a low-cost supplement with real emerging evidence on blood pressure and cardiac function, though the longevity claim still needs confirmation by adequately powered human RCTs.