Taurine: Role, Food Sources and Supplement Evidence
Taurine is not a protein-building amino acid. Learn its roles in the body, why vegan diets contain none, what human trials found, safety limits and what official bodies have not set.
Content last updated . This page has not been medically reviewed.
What is Taurine good for?
What the body uses it for, and how strong the evidence is. A normal job in the body is not proof that extra supplements add benefit; each card says which.
Cell volume and fluid balance
Established roleTaurine helps cells keep their volume steady and helps manage calcium levels inside cells.
Supplements: Normal body role. The body makes taurine and also gets it from animal foods; no source read shows extra supplements add benefit.
Bile salt formation
Established roleTaurine supplies the building material for bile salts, which the body uses in digesting fats.
Supplements: Normal body role; supplements have not been shown to improve digestion.
Brain and nervous system function
Lab or animal research onlyTaurine is one of the most abundant amino acids in the brain and plays several roles in nerve development and protecting nerve cells.
Supplements: Mostly lab and animal findings. No human trial read shows better focus, mood or memory from supplements.
Eye and retina health
Lab or animal research onlyTaurine is the most abundant amino acid in the retina of the rat eye and is described as important for light-sensing cells to develop.
Supplements: Evidence is animal-based; no source read shows supplements protect human vision.
Blood pressure and blood fats
Preliminary or mixedIn pooled trials, taurine supplements were linked with small average drops in blood pressure, cholesterol and triglycerides.
Supplements: Small average changes in lab and clinic measures, mostly in people with existing liver or metabolic problems; results differ between analyses and heart outcomes were not shown.
Blood sugar and insulin markers
Preliminary or mixedA 2026 pooled analysis reported lower fasting glucose, HbA1c and insulin resistance with taurine supplements; a 2020 analysis found no effect on fasting glucose.
Supplements: Mixed and limited to lab markers; not a substitute for diabetes care.
Liver blood-test markers
Preliminary or mixedPooled trials reported lower ALT and AST liver enzymes with taurine supplements, mainly in people with liver or metabolic problems.
Supplements: Lab-marker changes in small studies; not shown to treat liver disease.
Healthy aging research
Lab or animal research onlyBlood taurine falls with age in mice, monkeys and people, and supplements extended health span in animals.
Supplements: Not shown in people; the authors say human clinical trials are needed.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Health goals (4)
- Blood Pressure SupportPreliminary or mixed
Two meta-analyses report average systolic drops of about 4 to 5 mmHg with taurine supplements, mostly in people with existing conditions. Results across trials were not uniform.
- Heart HealthPreliminary or mixed
Pooled trials report small average improvements in blood pressure and blood fats with taurine supplements. Meta-analyses of mostly short trials, many in people with existing liver or metabolic problems, report small average changes in lab or clinic measures; they do not show fewer heart attacks or strokes.
- Blood Sugar BalancePreliminary or mixed
The 2026 meta-analysis of 34 trials reported lower fasting glucose, HbA1c and insulin resistance; the 2020 analysis found no effect on fasting glucose. Evidence is mixed.
- Cholesterol BalancePreliminary or mixed
Meta-analyses report lower total cholesterol and triglycerides; the 2020 analysis found no effect on LDL or HDL, while the 2026 one reported a small LDL drop. Evidence is mixed.
Body systems (4)
- Cardiovascular SystemPreliminary or mixed
Pooled trials report small average drops in blood pressure and cholesterol with taurine supplements. Meta-analyses of mostly short trials, many in people with existing liver or metabolic problems, report small average changes in lab or clinic measures; they do not show fewer heart attacks or strokes.
- Heart & CirculationPreliminary or mixed
Pooled trials report small average drops in blood pressure and cholesterol with taurine supplements. Meta-analyses of mostly short trials, many in people with existing liver or metabolic problems, report small average changes in lab or clinic measures; they do not show fewer heart attacks or strokes.
- Nervous SystemLab or animal research only
Taurine is one of the most abundant amino acids in the brain and is involved in nervous system development and cell protection. This is lab and animal-based understanding; it does not show that extra supplements help.
- Brain & FocusLab or animal research only
Taurine is abundant in the brain, but no human trial in the sources read shows that supplements improve focus or thinking.
Body parts (5)
- BrainLab or animal research only
Taurine is among the most abundant amino acids in the brain. Its exact actions are not fully known, and this does not prove supplements benefit the brain.
- CellsEstablished role
Taurine acts as an osmolyte, helping regulate cell volume, and helps modulate calcium inside cells. This is a normal role, not a supplement benefit.
- EyesLab or animal research only
Taurine is the most abundant amino acid in the retina and other eye tissues of the rat, and is described as critical for photoreceptor development. Evidence is mostly from animals.
- Nervous SystemLab or animal research only
Taurine serves many functions in the central nervous system, from development to cell protection, mainly shown in lab and animal research.
- MusclesLab or animal research only
Taurine is one of the most abundant amino acids in muscle tissue. No source read shows that supplements change muscle health in people.
Functional actions (2)
- Cardiovascular SupportPreliminary or mixed
Pooled trials report small average drops in blood pressure and cholesterol with taurine supplements. Meta-analyses of mostly short trials, many in people with existing liver or metabolic problems, report small average changes in lab or clinic measures; they do not show fewer heart attacks or strokes.
- NeuroprotectiveLab or animal research only
Taurine is described as a cytoprotectant against stress-related damage to nerve cells, in the retina and the nervous system. Evidence is lab and animal research.
Biomarkers (8)
- ALTPreliminary or mixed
The 2026 meta-analysis reported lower ALT with taurine supplements, largely in people with liver or metabolic problems.
- ASTPreliminary or mixed
The 2026 meta-analysis reported lower AST with taurine supplements, largely in people with liver or metabolic problems.
- Blood GlucosePreliminary or mixed
Fasting glucose fell by about 6 mg/dL in a 2026 meta-analysis, but a 2020 analysis found no effect. Mixed, from trials of mostly short duration.
- CRPPreliminary or mixed
The 2026 meta-analysis reported lower CRP (an inflammation marker) with taurine supplements; results are from a pooled lab measure and not shown to change illness.
- HbA1cPreliminary or mixed
A 2026 meta-analysis reported an average HbA1c drop of 0.21 percentage points with taurine supplements. A lab measure, not proof of better long-term outcomes.
- InsulinPreliminary or mixed
A 2026 meta-analysis reported lower fasting insulin with taurine supplements. A lab measure, not proof of better long-term outcomes.
- LDL CholesterolPreliminary or mixed
The 2026 meta-analysis reported a small LDL drop (about 5 mg/dL); the 2020 analysis found no significant LDL effect. Mixed.
- TriglyceridesPreliminary or mixed
Both meta-analyses reported modestly lower triglycerides with taurine supplements.
Documented risks and interactions (2)
- Safety at supplemental intakes. A 2008 risk assessment found strong evidence of no adverse effects at supplemental taurine up to 3 g a day in healthy adults; above that, long-term safety data are not enough. Official upper limits have not been set for amino acids.
- Energy-drink combinations and medicines. Energy drinks often combine taurine with caffeine and sugar. The ISSN advises against them for children 2 to 12, during pregnancy, when trying to conceive or breastfeeding, and urges caution for people with heart, metabolic, liver, kidney or nerve conditions or on medicines.
Overview
Taurine is often called an amino acid, but it is one of the few amino acids not incorporated into proteins. [1] It is not among the nine essential amino acids listed by MedlinePlus. [2] A 2012 review describes it as an organic osmolyte (it helps regulate cell volume) that provides a substrate for bile salts, and as one of the most abundant amino acids in the brain, retina and muscle. [1] Taurine appears in supplements, energy drinks and functional foods. For the essential nine see essential amino acids.Food sources and plant-based diets
Taurine is found in animal foods. In a small 1986 comparison, taurine was absent from the vegan diet and varied in omnivore diets; urinary levels in vegans were less than half, but plasma and breast-milk levels were only slightly lower. [3] That is an old, small study and does not show what level is best. A table of taurine in common foods from a food-composition source: Proper evidence not found (we searched PubMed and did not read a USDA, NHS or Health Canada table). See supplements in vegetarian and vegan diets.Evidence labels used on this page
Promising but limited, mixed, insufficient evidence and preclinical (animal or laboratory work) are used with their usual meanings. Lab markers such as blood pressure are kept separate from outcomes like heart attacks.Evidence by use
| Question | What the source found | Label |
|---|---|---|
| Blood pressure and cholesterol | A 2020 meta-analysis of 12 trials, mostly in people with liver or metabolic problems, used 0.5 to 6 g a day for 15 days to 6 months. [4] It found lower blood pressure and cholesterol. [4] | Promising but limited; mostly people with existing conditions |
| Cardiometabolic markers | A 2026 meta-analysis of 34 randomized trials reported lower systolic blood pressure (-4.38 mmHg) among other markers. [5] | Promising but limited; lab and clinic measures, not heart attacks |
| Aging | Blood taurine declines with age in mice, monkeys and humans; the authors called for human clinical trials. [6] | Preclinical; human link is a correlation |
| Energy drinks | The ISSN said the main ergogenic ingredients appear to be caffeine and carbohydrate; benefits of other ingredients remain to be determined. [7] | Insufficient evidence for taurine itself |
More detail: taurine, energy drinks, heart health and longevity research.
Related
Carnitine · Beta-alanineFrequently asked questions
Is taurine an amino acid?
Yes, but it is not built into proteins and is not on the essential list. [1][2]
Is taurine what gives energy drinks their effect?
The ISSN said caffeine and carbohydrate appear to be the main ergogenic ingredients. [7]
Do vegans lack taurine?
A 1986 study found none in the vegan diet, with plasma and breast-milk levels only slightly lower than omnivores. [3]
Does taurine slow aging?
Not shown in people. Human trials were called for. [6]
How much taurine is too much?
No official upper limit was found; one risk assessment found strong evidence of no adverse effects up to 3 g a day in healthy adults. [8][9]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Amounts and safety
- Blood pressure or diabetes medicines: because trials measured these markers, mention taurine to your prescriber or pharmacist. [5] Do not change a prescribed medicine on your own.
- Energy drinks: the ISSN said they are not recommended for children aged 2 to 12, or for people who are pregnant, trying to become pregnant or breastfeeding. [7] Caffeine is the larger concern; see caffeine and energy drinks.
- Kidney or liver disease, pregnancy, children, other medicines: specific data were not found in the sources we read. Ask a clinician; see medication interactions and pregnancy and breastfeeding.
- Labels and quality: reading supplement labels.
References
- Review: taurine: a "very essential" amino acid. Mol Vis 2012 Read 2026-10-23.
- MedlinePlus Medical Encyclopedia: Amino acids (U.S. National Library of Medicine), review date 21 January 2025 Read 2026-10-23.
- Taurine concentrations in the diet, plasma, urine and breast milk of vegans compared with omnivores. Br J Nutr 1986 Read 2026-10-23.
- Taurine supplementation on obesity, blood pressure and lipid profile: meta-analysis of randomized controlled trials. Eur J Pharmacol 2020 Read 2026-10-23.
- Oral taurine supplementation and cardiometabolic risk factors: meta-analysis of randomized clinical trials. Nutr Rev 2026 Read 2026-10-23.
- Singh et al., Taurine deficiency as a driver of aging. Science 2023 Read 2026-10-23.
- International Society of Sports Nutrition position stand: energy drinks and energy shots. J Int Soc Sports Nutr 2023 Read 2026-10-23.
- Shao and Hathcock, Risk assessment for the amino acids taurine, L-glutamine and L-arginine. Regul Toxicol Pharmacol 2008 Read 2026-10-23.
- Tolerable Upper Intake Level for Individual Amino Acids in Humans: a narrative review. Adv Nutr 2023 Read 2026-10-23.