Taurine

Most taurine trials in our sources are small and short, and many enrolled people with health conditions; each section names the population. In exercise and energy drink research, taurine is often tested together with caffeine, so we say which form each study used. Our grades are proposals per outcome; the evidence grading method explains what each grade requires.

Does taurine improve endurance performance?

Modestly, in short-term trials [1][2]. A 2018 meta-analysis (a study that pools results from many trials) set out to test isolated oral taurine, without caffeine, on endurance performance [1]. It included 10 studies, with doses from 1 to 6 g a day given as single doses or for up to 2 weeks [1]. Taurine improved overall endurance performance compared with control (Hedges' g = 0.40, 95% CI 0.12-0.67; g is a standardized effect size), and the result was similar in time-to-exhaustion trials (g = 0.43) [1]. Single doses and multi-day courses did not differ, and the dose did not change the size of the effect [1].

A larger 2025 meta-analysis pooled 23 randomized trials with 308 participants, all testing a single dose [2]. It found that acute taurine may be associated with small-to-moderate improvements in overall exercise performance (g = 0.25, 95% CI 0.10-0.39), with heterogeneity between studies (I2 = 61%, a measure of how much results differ between studies) [2]. In moderator analyses, benefits looked clearer in males and in aerobic endurance, strength/power and agility tasks, while results for anaerobic capacity and muscular endurance were inconsistent; several of these subgroup effects weakened when influential studies were excluded, and the authors noted that effectiveness likely varies with dose, blinding and exercise context [2]. The authors rated the certainty of the evidence low to very low because of heterogeneity, imprecision and risk of bias, and prediction intervals often included no effect [2].

A 2021 systematic review of 10 articles looked at doses and reported mixed findings on blood markers: 1 g before or after exercise lowered lactate, while 6 g before exercise did not [3]. Both meta-analyses rest on trials with short exposures, which is why the proposal carries the short-term modifier [1][2].

Trials of caffeine plus taurine show a separate picture. A 2026 meta-analysis of 11 trials with 234 participants found longer time to exhaustion (SMD = 0.54; the SMD is a standardized mean difference) and higher peak power (SMD = 0.55) with the combination than with placebo [5]. The authors note the studies were few and generally small and could not separate the contribution of caffeine from that of taurine [5]. For other compounds studied for exercise, see beta-alanine and our physical performance hub.

Does taurine improve reaction time?

Evidence is mixed, and most of it comes from taurine combined with caffeine [4][5]. A 2025 network meta-analysis of 12 studies found that caffeine plus taurine was associated with faster reaction time than caffeine or taurine alone (g = 0.75, 95% CrI 0.29-1.18) [4]. A 2026 meta-analysis of caffeine-taurine trials also found the pooled estimate favored the combination over placebo (SMD = -1.49), but very high heterogeneity and a prediction interval crossing no effect meant the result was not consistent across settings [5].

Trials that tested each ingredient on its own point to caffeine. In a randomized, double-blind trial of 48 habitual caffeine users who had gone 24 hours without caffeine, 200 mg of caffeine improved executive control and working memory and shortened simple and choice reaction time [6]. In the same trial, 2000 mg of taurine made choice reaction time slower but shortened reaction time in the working memory tasks, and it reversed caffeine's effects on vigor [6]. The authors concluded that caffeine, not taurine or glucose, is likely responsible for the cognitive changes reported after energy drinks [6].

A placebo-controlled crossover trial in 19 female undergraduates compared 80 mg caffeine, 1000 mg taurine, both together and placebo [7]. No treatment changed reaction time on one task, and on a second task adding taurine tended to weaken the benefit seen with caffeine alone [7]. Because the combination results and the single-ingredient results point in different directions, the proposal for taurine is mixed. Caffeine itself has its own caffeine monograph, and our energy hub covers related outcomes.

Does taurine lower blood pressure?

Slightly, in pooled trials of mixed populations [9][10][12]. A 2018 meta-analysis of 7 studies with 103 participants of varying age and health found mean reductions of about 3 mmHg in both systolic and diastolic blood pressure, with doses of 1 to 6 g a day for 1 day to 12 weeks and no adverse events reported [9]. Its authors describe these findings as preliminary [9].

Larger meta-analyses point the same way [10][12][13]. A 2024 meta-analysis of 20 randomized trials with 808 participants found systolic pressure 3.999 mmHg lower and diastolic pressure 1.435 mmHg lower with taurine than with control, and heart rate also fell [10]. In its subgroups, the systolic reduction was significant in healthy individuals as well as in people with heart failure or other conditions, while diastolic pressure fell significantly only in the hypertensive subgroup [10]. A 2024 metabolic syndrome meta-analysis by the same research group reported the same systolic estimate, so the two are not independent confirmation [10][13]. A 2026 meta-analysis of 34 trials reported systolic pressure 4.38 mmHg lower and diastolic 2.54 mmHg lower; its abstract describes the participants only as adults [12]. The 2018 and 2024 analyses mix healthy people with people who have heart or other conditions, so the average may not describe healthy adults [9][10].

The largest single trial in the pack enrolled 120 adults with prehypertension, which the trial authors describe as a key stage in the development of high blood pressure [11]. Over 12 weeks, 1.6 g of taurine a day lowered clinic systolic pressure by 7.2 mmHg against 2.6 mmHg with placebo, and diastolic by 4.7 against 1.3 mmHg [11]. Ambulatory 24-hour systolic pressure fell by 3.8 mmHg with taurine against 0.3 mmHg with placebo [11]. Results in this group may not apply to adults with normal blood pressure.

Does taurine lower blood triglycerides?

Possibly, though none of the pooled analyses is restricted to healthy adults [12][13][14]. A 2024 meta-analysis of 25 randomized trials with 1024 participants, built around metabolic syndrome measures, found triglycerides 18.315 mg/dL lower with taurine than with control, while HDL cholesterol did not change [13]. Doses ranged from 0.5 to 6 g a day and follow-up from 5 to 365 days [13].

A 2026 meta-analysis of 34 trials found triglycerides 14.42 mg/dL lower and reported that longer courses of 8 weeks or more gave larger changes in glucose and lipid measures [12]. A 2020 meta-analysis of 12 trials, mostly in patients with liver or metabolic dysregulation, found triglycerides 13.05 mg/dL lower, with a confidence interval reaching close to no effect (-25.88 to -0.22) [14]. None of these abstracts reports an estimate for healthy adults alone, so the proposal is capped for extrapolation from clinical populations.

What the evidence does not show

• Better thinking from taurine alone. A 2025 meta-analysis of 7 randomized trials with 402 people, including cognitively impaired and non-impaired groups, found no significant effect of taurine on cognitive scores, alone or with exercise training [8]. The authors concluded that the trials do not provide sufficient evidence that taurine enhances cognitive function [8].
• Less fatigue or more energy as an authorized claim. EFSA concluded that a cause and effect relationship has not been established between taurine and delay in the onset of fatigue or enhancement of physical performance, or normal energy-yielding metabolism [26].
• Slower aging in people. The 2023 aging findings come from animals plus human associations, and a 2025 human study found no link between blood taurine and age or physical performance [17][18].

In one study of 8 healthy men given 4 g by mouth, blood levels peaked at 1.5 ± 0.6 hours and the elimination half-life, the time for the blood level to halve, was 1.0 ± 0.3 hours [16].

In the 2025 exercise meta-analysis, capsule and drink forms both appeared effective [2]. Its analysis suggested taking taurine about 1 hour before exercise might give the most favorable results, but this timing finding did not hold up in sensitivity analyses [2]. These are study findings, not instructions.

The trial syntheses in the pack report few problems [9][10][13]. Meta-analyses of 20 and 25 randomized trials found no significant adverse effects compared with control [10][13], and the 2018 blood pressure meta-analysis reported no adverse events [9].

A 2008 risk assessment found no systematic pattern of adverse effects from oral taurine in humans [15]. It found strong evidence for the absence of adverse effects at supplemental intakes up to 3 g a day, which it set as the observed safe level for normal healthy adults [15]. Higher amounts have been tested without adverse effects, but the authors judged the data too limited for a confident conclusion on long-term safety [15]. This assessment was run by researchers employed by the Council for Responsible Nutrition [15].

EFSA's 2009 opinion on energy drink ingredients found that its no-observed-adverse-effect level was 120-fold higher than the estimated mean and 43-fold higher than the 95th percentile intake of taurine from energy drinks, and concluded that this exposure is not of safety concern [25]. EFSA considered that adverse reports linked to energy drinks could be due to the well known side effects of high caffeine intake, and said that assuming a causal relationship with taurine intake is lacking scientific evidence [25]. Its panel also concluded that the diuretic and sodium-loss effects of the tested drinks are largely mediated by caffeine [25].

As of November 12, 2026, the sources we checked (the NIH Office of Dietary Supplements fact-sheet index as archived on November 1, 2026, and NCBI LiverTox) have no taurine entry.

One 2022 assessment estimated that drinking more than 500 mL of energy drinks would push taurine intake above the reference value the authors used [19].

EFSA's panel concluded that the diuretic and sodium-loss effects of the energy drinks it reviewed are largely mediated by caffeine, and noted that other interactions between taurine and caffeine were not investigated [25]. As of November 11, 2026 we found no human studies of taurine interacting with medicines (PubMed and Europe PMC searches, November 11, 2026). Health Canada's taurine monograph requires no contraindication or known adverse reaction statements on licensed products [23].

The absence of studies is not evidence of safety with any medicine. If you take any medicine, talk to your doctor or pharmacist before combining it with taurine.