Taurine — Sulfonic amino acid — conditionally essential / abundant in muscle, heart, brain, retina; declining with age
Taurine is one of the most abundant amino acids in the human body, found at high concentrations in skeletal muscle (50 mM), brain, retina, and cardiac tissue. It is conditionally essential — synthesized from methionine/cysteine but biosynthetic capacity declines with age. Key 2023 finding (Singh et al., Science 2023, PMID: 37289910): plasma taurine levels decline 80% from youth to old age across species (mice, monkeys, humans). In mice, taurine supplementation increased median lifespan 10–12% when started at middle age. Mechanisms: (1) Taurine is the most abundant intracellular osmolyte — maintains cell volume, stabilizes membranes, and prevents protein aggregation; (2) Conjugates with bile acids (taurocholate) to facilitate fat digestion and gut microbiome balance; (3) Modulates GABA-A and glycine receptor function — calming/neuroprotective; (4) Reduces mitochondrial ROS via complex I protection; (5) Attenuates telomere shortening; (6) Reduces DNA damage markers (8-OHdG); (7) Suppresses NF-κB inflammatory signaling; (8) Improves insulin sensitivity and reduces visceral adiposity in rodent studies; (9) Restores stem cell pools in muscle and brain in aging mice.
Overview
This page is part of Hormonaly's evidence-graded compound library. All clinical claims are linked to peer-reviewed sources via our dual-layer citation verification pipeline.
Compound Class
Sulfonic amino acid — conditionally essential / abundant in muscle, heart, brain, retina; declining with age
Mechanism of Action
Taurine is one of the most abundant amino acids in the human body, found at high concentrations in skeletal muscle (50 mM), brain, retina, and cardiac tissue. It is conditionally essential — synthesized from methionine/cysteine but biosynthetic capacity declines with age. Key 2023 finding (Singh et al., Science 2023, PMID: 37289910): plasma taurine levels decline 80% from youth to old age across species (mice, monkeys, humans). In mice, taurine supplementation increased median lifespan 10–12% when started at middle age. Mechanisms: (1) Taurine is the most abundant intracellular osmolyte — maintains cell volume, stabilizes membranes, and prevents protein aggregation; (2) Conjugates with bile acids (taurocholate) to facilitate fat digestion and gut microbiome balance; (3) Modulates GABA-A and glycine receptor function — calming/neuroprotective; (4) Reduces mitochondrial ROS via complex I protection; (5) Attenuates telomere shortening; (6) Reduces DNA damage markers (8-OHdG); (7) Suppresses NF-κB inflammatory signaling; (8) Improves insulin sensitivity and reduces visceral adiposity in rodent studies; (9) Restores stem cell pools in muscle and brain in aging mice.
Regulatory Status
NOT FDA approved for any indication. Generally Recognized As Safe (GRAS) as a food additive. OTC supplement. Widely available.
Evidence Level
B — Singh et al. Science 2023 landmark study: plasma taurine declines 80% with aging; supplementation extends lifespan 10–12% in mice; improved multiple aging biomarkers in monkeys. Clinical data: Beyranvand et al. (2011, n=29 heart failure): 3 g/day taurine + exercise improved VO2max; meta-analysis of 12 RCTs confirms cardiovascular benefits. No longevity-specific human RCT yet.