Taurine: Bile Acids, Heart Rhythm & the Longevity Research

Taurine is a sulfur-containing amino acid (technically an amino sulfonic acid) that's abundant in the brain, heart, retina, and white blood cells. It's the most abundant free amino acid in the heart. Despite being well-known as an energy drink ingredient, its actual effects are calming rather than stimulating — it acts as an inhibitory neuromodulator.

Key Roles

Taurine conjugates with bile acids (forming taurocholate and taurochenodeoxycholate), which is essential for fat digestion and the absorption of fat-soluble nutrients. In the heart, taurine helps regulate calcium handling and membrane stability, and taurine deficiency in cats (who can't synthesize it) causes fatal dilated cardiomyopathy. In the retina, taurine is protective against light-induced oxidative damage.

The Longevity Study

A major 2023 study published in Science found that taurine levels decline with age across multiple species, and that taurine supplementation in middle-aged mice extended median lifespan by 10-12%, improved bone density, muscle function, immune function, and metabolic health. Human observational data in the same study showed that higher taurine levels correlated with better metabolic and cardiovascular markers. Human intervention trials are ongoing.

Food Sources

Shellfish (especially scallops and mussels), dark poultry meat, and fish are the best dietary sources. Taurine is nearly absent from plant foods, making vegans dependent on endogenous synthesis (from cysteine and methionine, requiring B6). Energy drinks contain synthetic taurine at 1,000-2,000 mg per serving.