Taurine

Taurine has been dismissed for years as a minor amino acid found in energy drinks — an afterthought compared to branched-chain amino acids or creatine. The publication of a landmark 2023 Science paper changed that calculus permanently. The study by Yadav et al. (DOI: 10.1126/science.abn9257) demonstrated that taurine levels decline significantly with age across worms, mice, and humans; that supplementing taurine reversed this decline; and that taurine-supplemented mice lived 10–12% longer (12% in females, 10% in males) with compressible morbidity — more time in health, not just extended decline. The mechanism is multifactorial in ways that impress longevity biologists. Taurine supplementation in aged animals reversed increases in DNA damage markers, restored telomerase activity (addressing telomere attrition), improved mitochondrial membrane potential (addressing mitochondrial dysfunction), reduced the senescent cell burden (addressing cellular senescence), and decreased levels of inflammatory cytokines. This is a compound addressing at least four major aging hallmarks through what appears to be primarily a depletion-and-restoration dynamic rather than an artificial pharmacological override. The human relevance is reinforced by the age-related depletion data. Blood taurine levels in 60-year-old humans are approximately 80% lower than in 5-year-olds. A 3-gram/day supplementation protocol raised taurine to levels comparable to younger individuals in human participants included in the study. Taurine is produced endogenously from methionine and cysteine but production declines with age; dietary sources include meat and seafood. Taurine's safety profile is exceptional — it is one of the most abundant amino acids in the human body, present in breast milk, and has been consumed in multi-gram doses by billions of people in energy drinks without documented serious adverse effects at typical doses. For biohackers, the compound represents an unusually clean risk-benefit profile: the downside is minimal, the mechanism is scientifically grounded, and the 2023 Science publication is among the most rigorous longevity evidence published for any accessible compound. Typical longevity dosing is 2–6 grams/day, widely available OTC at low cost.