Taurine

What is taurine and what does it do in the body?

According to the review by Ripps and Shen, taurine is an organic osmolyte that plays a role in regulating cell volume; it supplies the substrate for bile salt formation and takes part in adjusting intracellular free calcium levels. It is one of the few amino acids not incorporated into proteins; it is among the most abundant amino acids in the brain, retina, muscle tissue, and many organs of the body. Taurine deficiency is reported to be associated with cardiomyopathy, kidney dysfunction, developmental abnormalities, and severe damage to retinal neurons; the cellular and biochemical mechanisms of taurine’s effects are not fully known. The review reports from animal models results suggesting that taurine may play a therapeutic role in managing epilepsy and diabetes; this part is not human evidence. ^[1]

The review by Lourenço and Camilo describes taurine as the most abundant intracellular amino acid in humans; in healthy people the usual source of taurine is the diet, and it is also synthesized from methionine and cysteine in the presence of B6. Taurine is an essential amino acid for premature infants and is supplied by breast milk; patients receiving long-term parenteral nutrition (including premature infants and newborns) and those with chronic liver, heart, or kidney failure are at risk of taurine deficiency and may benefit from supplementation; the review states that additional studies are needed on the benefit of replenishing taurine pools and on routinely adding taurine to parenteral nutrition regimens. ^[2]

Which foods contain taurine?

Laidlaw and colleagues measured taurine content in 29 meats, 9 dairy products, 17 infant or adult feeding solutions, and 48 plant foods (vegetables, nuts-seeds, fruits, and legumes). Taurine was detected in meat, dairy products, and infant feeding solutions and not detected in plant products and adult feeding solutions; the study also presents intakes calculated for omnivore, lacto-ovo-vegetarian, and vegan sample diets. ^[3] Because taurine was not detected in plant products, food-derived taurine intake is low with a vegan diet; the study did not measure clinical outcomes. A correction notice was published for the article in 1990; only the qualitative result at the food-group level is reported here. ^[3]

Does taurine lower blood pressure?

The 2018 meta-analysis by Waldron and colleagues pooled 7 peer-reviewed studies (103 participants; various ages and health conditions) that examined the effect of isolated oral taurine on resting blood pressure and met the inclusion criteria. Taurine reduced systolic pressure (Hedges g −0.70; 95% CI −0.98 to −0.41) and diastolic pressure (g −0.62; 95% CI −0.91 to −0.34); this corresponded to a mean reduction of about 3 mmHg (in the range of 0–15 mmHg for systolic and 0–7 mmHg for diastolic). The amounts used in the studies were 1–6 g/day, durations ranged from 1 day to 12 weeks, and no adverse events were reported. The authors characterize the findings as preliminary. ^[4]

In the recent meta-analysis by Nie and colleagues examining 34 RCTs, systolic pressure fell by a mean of 4.38 mmHg (95% CI −7.26 to −1.50) and diastolic pressure by 2.54 mmHg (95% CI −3.97 to −1.11). ^[5] The Waldron meta-analysis is small (103 participants) and study durations range from one day to 12 weeks. Both meta-analyses examine the change in blood pressure with taurine against placebo or control; equivalence to hypertension treatment has not been reported as a result. This row is therefore at level C.

Does taurine affect blood sugar and lipids?

The same 34-RCT meta-analysis also reported significant reductions in blood sugar and lipid markers: fasting glucose −5.90 mg/dL (95% CI −9.65 to −2.15), HbA1c −0.21% (−0.37 to −0.05), triglycerides −14.42 mg/dL (−23.60 to −5.25), total cholesterol −12.41 mg/dL (−19.10 to −5.71), and LDL cholesterol −5.08 mg/dL (−8.35 to −1.81). Liver enzymes (AST −9.65 U/L; ALT −8.26 U/L), CRP, and some oxidative stress markers also fell. The authors reported different effects in duration and dose subgroup analyses; subgroup findings do not replace the main result. ^[5] Whether these markers translate into clinical outcomes (heart attack, stroke, diabetes complications) was not measured in this study; the row is at level C.

Does taurine improve athletic performance?

The 2018 meta-analysis by Waldron and colleagues pooled 10 peer-reviewed studies examining the effect of isolated oral taurine on endurance performance. Taurine improved overall endurance performance (Hedges g 0.40; 95% CI 0.12–0.67); the effect was similar in time-to-exhaustion (TTE) trials (7 studies) (g 0.43; 95% CI 0.12–0.75). There was no difference between acute (single dose) and chronic (>1 day) administration, and the amount did not significantly change the effect; amounts were 1–6 g/day, given as a single dose or for up to 2 weeks. ^[6]

The 2025 meta-analysis by Deng and colleagues examined the acute effect of single-dose taurine in 23 randomized studies (69 effect sizes, 308 participants): a small-to-moderate improvement in overall performance (g 0.25; 95% CI 0.10–0.39; I² 61%) was reported; the benefit was more pronounced in men and in aerobic endurance, strength/power, and agility/coordination tasks, and inconsistent for anaerobic capacity and muscular endurance. Some of the effective subgroups weakened when effective studies were excluded, prediction intervals often included zero, and certainty of evidence was rated low to very low by GRADE. ^[7] This row is therefore at level C: the effect is small and certainty is low.

Does taurine affect cognitive function?

The 2025 meta-analysis by Cao and colleagues examined the effect of taurine on cognition in people with and without cognitive impairment in 7 RCTs (9 intervention trials, 402 people). Taurine alone or together with exercise showed no significant effect on cognitive scores; taurine added to therapeutic drugs did not produce more improvement than the drugs alone. In a subgroup analysis, this combination was reported to be associated with a significant increase on the Mini-Mental State Examination (WMD 3.09; 95% CI 2.29–3.90). The authors concluded that there is not enough evidence that taurine supplementation improves cognition. ^[8] Because the subgroup result does not replace the main result, the row is graded E.

Does taurine slow aging?

The 2023 Science study by Singh and colleagues reported that circulating taurine concentration declines with age in mice, monkeys, and humans. Taurine supplementation that reversed the decline increased healthspan and lifespan in mice and healthspan in monkeys; extended healthspan and lifespan were also reported in worms. Reductions in cellular senescence, mitochondrial dysfunction, DNA damage, and inflammation have been put forward as mechanisms. In humans, it has only been shown that lower taurine levels are associated with many age-related diseases and that taurine levels rise after acute endurance exercise; the authors state that clinical studies appear necessary to test whether taurine deficiency drives aging in humans. The study’s PubMed record states that Columbia University filed provisional patent applications on which one of the authors is an inventor. ^[9]

The row is therefore at level E: lifespan extension has not been shown in humans, and the association between blood level and disease is not evidence of causation.

Is taurine safe, and is taurine in energy drinks the same?

No adverse events were reported in Waldron’s blood pressure meta-analysis. ^[4] In the risk assessment by Shao and Hathcock, a classical tolerable upper intake level (UL) could not be calculated for taurine because there was no systematic pattern of side effects; instead, the “observed safe level” (OSL) method was used: according to published human studies, the evidence for the absence of side effects at supplemental intakes of up to 3 g per day in healthy adults was found to be strong. Although higher amounts were tested without side effects, they were not selected as the OSL because data on long-term safety were found to be insufficient. ^[10] The affiliation reported in PubMed for one of the authors is a supplement industry association; the OSL is not a UL or a dose recommendation. ^[10]

Both Waldron meta-analyses examined isolated oral taurine. Because in energy drinks taurine is found together with caffeine and sugar, findings in those drinks are outside this scope, and it is not possible to attribute the effect to a single ingredient. ^{[4] [6]}

How are taurine supplements regulated in Türkiye?

For every dietary supplement to be placed on the market in Türkiye, approval from the Ministry of Agriculture and Forestry is mandatory; applications for approval of imported products can be made only to the Istanbul and Ankara Provincial Directorates. ^[12]

In the latest update of the Ministry’s Dietary Supplements Restricted Substances List (September 21, 2026), the source in the “Taurine” row is “chemical synthesis”; at most 150 mg/day is written in the ages 4–10 daily intake column and at most 800 mg/day in the ages 11 and over column; the publication dates are January 22, 2016 for ages 11 and over and May 2, 2016 for ages 4–10. ^[11] The study amounts in the meta-analyses were reported as 1–6 g/day (1,000–6,000 mg/day); this range is above the list’s limit for ages 11 and over (800 mg/day). Study amounts and the daily intake column of the list are not of the same magnitude, and the OSL (3 g/day) is also a separate concept. ^{[4] [11] [10]}

Evidence table: claim, population, and limits

This guide does not recommend personal doses. For blood pressure medication use, chronic disease, and childhood, the decision depends on individual evaluation.