Taurine is a sulfur-containing amino acid-like compound (an amino sulfonic acid, not used to build protein) concentrated in meat, seafood, and bile. The body synthesizes it from cysteine, but plant food contains essentially none, so strict vegetarian and vegan diets supply little of it. A controlled comparison of vegans and matched omnivores found taurine completely absent from the vegan diet, with vegans excreting less than half as much taurine in urine as omnivores, though plasma and breast-milk levels were only slightly lower.[1]

Taurine
Taurine
Abbreviation Tau
Molecular formula C2H7NO3S
Essential? Conditionally essential (synthesized from cysteine; absent from plant food)
Function Bile conjugation, membrane stabilization, structural analog of glycine and GABA
Food sources Meat, seafood, gelatin-adjacent muscle-meat diets
Synonyms 2-Aminoethanesulfonic acid
Ray's verdict Generally helps
Antiestrogenic in the same sense as glycine; protective in nerve and eye tissue

Structure and function

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Taurine is structurally similar to glycine (and to beta-amino-propanoic acid, and to GABA), and Ray Peat considered it antiestrogenic in that structural sense, alongside glycine's role opposing the generalized cellular excitation estrogen produces.[2]

Another type of amino acid, taurine, is structurally similar to glycine (and to beta amino propanoic acid, and to GABA), and it can be thought of as antiestrogenic in this context.

— Ray Peat[3]

Intake

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Dietary intake tracks the meat-vs-plant gap directly: average daily taurine intake on an omnivore diet is roughly 150 mg, versus essentially none on a vegan diet, and supplemental intakes as low as 400 mg daily have been reported to measurably reduce platelet hyperaggregability, a marker elevated in vegetarians.[4]

Eyes and nervous tissue

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An article on aging and infant eyes cites experimental work in which taurine blocked the retinal-dystrophy effects of excess melatonin and supported metabolism in the pigmented epithelium and photoreceptors.[5]

Taurine in 10(-3) M concentration blocks the action of exogenic melatonin as well as has a pronounced positive action on metabolism of dystrophic changes in the pigmented epithelium and photoreceptors.

— Mironova et al.[6]

Practical Q&A

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Asked whether taurine could substitute for glycine/gelatin in offsetting the anti-thyroid effect of muscle meat, Peat did not treat it as a direct substitute:

I don't think it will have a similar effect, but it might provide its own unique benefit.

— Ray Peat[7]

Asked whether a potato-and-mushroom diet without muscle meat could still supply enough taurine (along with carnosine, carnitine, and creatine, none of which come from plant food), Peat answered:

I think so.

— Ray Peat[8]

Cardiovascular and stress hormones

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In a double-blind, placebo-controlled trial in 19 young people with borderline high blood pressure, 6 g/day of taurine for 7 days lowered systolic blood pressure by 9.0 mmHg and diastolic by 4.1 mmHg, versus 2.7 and 1.2 mmHg respectively on placebo. The drop tracked a significant fall in plasma adrenaline (epinephrine), with little change in noradrenaline; baseline adrenaline was already higher in the borderline-hypertensive group than in normal subjects, and a glucagon challenge produced a bigger adrenaline spike in the borderline-hypertensive group, an effect taurine blunted.[9]

A 2009 JACC Viewpoint treats taurine as about 25% of the human cardiomyocyte amino-acid pool, a regulator of intracellular calcium and an antioxidant, and notes reduced taurine in ischemic cardiomyopathy plus only one small human supplementation study at the time of writing.[10] In a double-blind, randomized, crossover, placebo-controlled trial in 14 patients with congestive heart failure, four weeks of added taurine improved NYHA functional class, pulmonary crackles, and chest-film abnormalities versus placebo; no patient worsened on taurine, while four worsened on placebo.[11]

Neuroprotection and the gut-brain axis

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In mice, long-term arsenic exposure caused hippocampal neuron loss, gut microbiota dysbiosis (elevated Firmicutes and Parabasilia, depleted Firmicutes A and Bacteroidetes), and downregulated antioxidant-stress metabolites, producing memory decline and anxiety/depression-like behavior. Taurine supplementation prevented these outcomes by inhibiting the arsenic-driven shift in gut microbiota and correcting the oxidative-stress dysregulation in brain tissue, rather than acting on the brain directly.[12]

In mice made depressed by repeated social defeat, taurine levels in the front of the brain fell, and taurine supplements restored normal behavior and protected the connections between nerve cells.[13]

ADHD model (SHR)

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High-dose taurine reduced hyperactive locomotion and altered resting-state fMRI signals in spontaneously hypertensive rats, with lower inflammatory markers (IL-1β, CRP); low-dose taurine increased locomotion instead.[14] High-dose taurine also increased spontaneous alternation and decreased striatal DAT and dopamine uptake in SHR, while raising striatal BDNF.[15] See ADHD.

Blood sugar, blood fats and exercise

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A meta-analysis of randomized trials found taurine supplements modestly lowered fasting blood sugar, insulin resistance, triglycerides, cholesterol, blood pressure and liver enzymes in adults.[16] A separate meta-analysis of randomized trials found a single dose of taurine before exercise gave a small boost to performance, though the evidence was rated low quality.[17]

Male reproduction

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In aged male rats, months of taurine in the drinking water raised testosterone and nitric oxide in the penis and restored mating behavior.[18]

Gallstones

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Gallstones are common enough in the United States to drive roughly 934,000 cholecystectomies a year across inpatient and outpatient settings.[19] In mice fed a lithogenic diet (0.5% cholesterol and 0.25% sodium cholate), gallstones formed within three weeks in the untreated group but not in mice whose diet was supplemented with 5% taurine; liver cholesterol mass in the taurine group fell after the third week, pointing to reduced hepatic cholesterol content as the mechanism behind taurine's protective effect.[20] A follow-up in the same lithogenic-diet model found taurine supplementation increased fecal bile acid excretion and shifted the bile acid pool toward chenodeoxycholic acid, suggesting taurine's protection against cholesterol gallstones also works by driving bile acid synthesis, not only by lowering liver cholesterol.[21] Both findings are from mouse models; a randomized trial of taurine for gallstone prevention in humans has not been published as of 2026.

Bile acids and gut bacteria

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The liver joins either taurine or glycine to bile acids. In mice prone to colitis, bile acids carrying taurine fed a sulfur-using gut bacterium, which then bloomed and brought on colitis; bile acids carrying glycine did not.[22] Healthy mice on the same diet did not develop colitis.

Lifespan

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In mice, taurine supplementation from middle age extended median lifespan by about 10 to 12% in both sexes, with better bone, muscle, insulin sensitivity, memory and immune markers and fewer senescent cells in tissues; worms also lived longer, yeast did not, and monkeys showed health gains without a lifespan test.[23] Circulating taurine fell with age in that study, but a 2025 analysis of three human cohorts, monkeys and mice found levels rose or stayed flat with age.[24][25]

See also

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References

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  1. ↑ Rana SK, Sanders TA. "Taurine concentrations in the diet, plasma, urine and breast milk of vegans compared with omnivores," Br J Nutr. 1986;56(1):17-27.
  2. ↑ Ray Peat, "Gelatin, stress, longevity," raypeat.com.
  3. ↑ Gelatin, stress, longevity, Ray Peat newsletter
  4. ↑ McCarty MF. "Sub-optimal taurine status may promote platelet hyperaggregability in vegetarians," Med Hypotheses. 2004;63(3):426-433.
  5. ↑ Mironova et al., cited in Ray Peat, "Aging eyes, infant eyes, and excitable tissues," raypeat.com, citing Oftalmol Zh (1989).
  6. ↑ Aging Eyes, Infant Eyes, and Excitable Tissues, Ray Peat newsletter
  7. ↑ Ray Peat Forum Q&A, collected in Ephemera: Ray's Email Exchanges
  8. ↑ Ray Peat Forum Q&A, collected in Ephemera: Ray's Email Exchanges
  9. ↑ Fujita T, Ando K, Noda H, Ito Y, Sato Y. "Effects of increased adrenomedullary activity and taurine in young patients with borderline hypertension," Circulation. 1987;75(3):525-532. PMID 3815764.
  10. ↑ Soukoulis V, Dihu JB, Sole M, Anker SD, Cleland J, Fonarow GC, Metra M, Pasini E, Strzelczyk T, Taegtmeyer H, Gheorghiade M. "Micronutrient deficiencies: an unmet need in heart failure," J Am Coll Cardiol. 2009;54(18):1660-1673. doi:10.1016/j.jacc.2009.08.012. PMID 19850206. Viewpoint.
  11. ↑ Azuma J, Sawamura A, Awata N, Ohta H, Hamaguchi T, Harada H, Takihara K, Hasegawa H, Yamagami T, Ishiyama T, et al. "Therapeutic effect of taurine in congestive heart failure: a double-blind crossover trial," Clin Cardiol. 1985;8(5):276-282. doi:10.1002/clc.4960080507. PMID 3888464. NYHA class improvement P < 0.02.
  12. ↑ Zhang H, Qiao W, Tai D, Lv Y, Qi H. "Taurine attenuates arsenic-induced neurotoxicity through modulation of gut microbiota structure," Psychopharmacology. 2026. doi:10.1007/s00213-026-07018-7.
  13. ↑ Zhu Y, Wang R, Fan Z, et al. "Taurine Alleviates Chronic Social Defeat Stress-Induced Depression by Protecting Cortical Neurons from Dendritic Spine Loss," Cell Mol Neurobiol. 2023;43(2):827-840. doi:10.1007/s10571-022-01218-3. PMID 35435537. Mouse study; reduced extracellular taurine in the medial prefrontal cortex; taurine improved tail-suspension immobility and social avoidance and preserved dendritic spines and NMDA receptor subunit 2A.
  14. ↑ Chen VC, Hsu TC, Chen LJ, et al. "Effects of taurine on resting-state fMRI activity in spontaneously hypertensive rats," PLoS One. 2017;12(7):e0181122. PMID 28700674.
  15. ↑ Chen VC, Chiu CC, Chen LJ, et al. "Effects of taurine on striatal dopamine transporter expression and dopamine uptake in SHR rats," Behav Brain Res. 2018;348:219-226. PMID 29694913.
  16. ↑ Nie Z, Liu Y, Zhang M, et al. "Effects of Oral Taurine Supplementation on Cardiometabolic Risk Factors: A Meta-analysis and Systematic Review of Randomized Clinical Trials," Nutr Rev. 2026;84(10):2028-2051. doi:10.1093/nutrit/nuaf220. PMID 41275513. 34 RCTs; fasting glucose MD −5.90 mg/dL (95% CI −9.65 to −2.15); HbA1c −0.21%; HOMA-IR −0.57; triglycerides −14.42 mg/dL; total cholesterol −12.41 mg/dL; LDL −5.08 mg/dL; systolic BP −4.38 mmHg; diastolic −2.54 mmHg; AST −9.65 U/L; ALT −8.26 U/L; CRP SMD −1.26; doses of 1.5-3.0 g/day did best.
  17. ↑ Deng H, Song T, Yin M, et al. "Does One Shot Work? The Acute Impact of a Single Taurine Dose on Exercise Performance: A Meta-Analytic Review," Scand J Med Sci Sports. 2025;35(9):e70123. doi:10.1111/sms.70123. PMID 40852891. 23 randomized trials, 308 participants; g = 0.25 (95% CI 0.10-0.39); no dose-response within 1-6 g; GRADE certainty low to very low.
  18. ↑ Yang J, Lin S, Feng Y, Wu G, Hu J. "Taurine enhances the sexual response and mating ability in aged male rats," Adv Exp Med Biol. 2013;776:347-355. doi:10.1007/978-1-4614-6093-0_32. PMID 23392896. Rat study; 20-month-old rats given taurine for 110 days; GnRH, LH, testosterone, penile NOS and NO rose.
  19. ↑ Unalp-Arida A, Ruhl CE. "Burden of gallstone disease in the United States population: Prepandemic rates and trends," World J Gastrointest Surg. 2024;16(4):1130-1148.
  20. ↑ Yamanaka Y, Tsuji K, Ichikawa T, Nakagawa Y, Kawamura M. "Effect of dietary taurine on cholesterol gallstone formation and tissue cholesterol contents in mice," J Nutr Sci Vitaminol (Tokyo). 1985;31(2):225-232.
  21. ↑ Yamanaka Y, Tsuji K, Ichikawa T. "Stimulation of chenodeoxycholic acid excretion in hypercholesterolemic mice by dietary taurine," J Nutr Sci Vitaminol (Tokyo). 1986;32(3):287-296.
  22. ↑ Devkota S, Wang Y, Musch MW, et al. "Dietary-fat-induced taurocholic acid promotes pathobiont expansion and colitis in Il10-/- mice," Nature. 2012;487(7405):104-108. doi:10.1038/nature11225. PMID 22722865. Mouse study in genetically susceptible Il10-/- mice; the bacterium was Bilophila wadsworthia, a sulphite reducer; a milk-fat diet raised taurine conjugation of bile acids; low-fat diet plus taurocholic acid, but not glycocholic acid, caused the bloom and colitis; wild-type mice did not develop colitis.
  23. ↑ Singh P, Gollapalli K, Mangiola S, et al. "Taurine deficiency as a driver of aging," Science. 2023;380(6649):eabn9257. doi:10.1126/science.abn9257. PMID 37289866. PMCID PMC10630957. Animal study (mice, rhesus monkeys, C. elegans, yeast) plus human cohort correlations. Mice: 1000 mg/kg/day orally from 14 months; "taurine supplementation increased the health span... and life span in mice and health span in monkeys"; yeast replicative lifespan not significant (Fig. 1G). Competing interest: Columbia University filed provisional patents.
  24. ↑ Fernandez ME, Bernier M, Price NL, et al. "Is taurine an aging biomarker?," Science. 2025;388(6751):eadl2116. doi:10.1126/science.adl2116. PMID 40472098. Longitudinal and cross-sectional measurements in humans, rhesus monkeys and mice.
  25. ↑ Marcangeli V, et al. "Experimental evidence against taurine deficiency as a driver of aging in humans," Aging Cell. 2025. doi:10.1111/acel.70191. PMID 41061678.