TaurineAmino Acid

• Blood pressureLikely helps

  A randomized, double-blind, placebo-controlled trial in prehypertensive adults used 1.6 g/day for 12 weeks [7].
  
  Clinic systolic pressure fell 7.2 mmHg against 2.6 mmHg on placebo; diastolic fell 4.7 mmHg against 1.3 mmHg [7].
  
  A 2018 meta-analysis, quoted in the 2023 Nutrients review, concluded taurine lowers blood pressure to a clinically relevant magnitude without major adverse effects [2].
  
  That review still asks for further trials to pin down optimal dose and duration [2]. ^[7]

• Insulin resistance in type 2 diabetesPossibly helps

  An 8-week randomized trial gave adults with type 2 diabetes 1 g three times daily, so 3 g/day [8].
  
  Serum insulin, HOMA-IR, and the inflammatory and oxidative markers TNF, hs-CRP and malondialdehyde all dropped significantly versus placebo [8].
  
  The numbers people actually get tested on did not move. HbA1c, fasting glucose and lipid profile showed no significant change [8]. ^[8]

• Heart failurePossibly helps

  Taurine has been an approved heart-failure medicine in Japan since 1985 [2].
  
  Human studies summarized in the 2023 Nutrients review report improved left ventricular function and exercise tolerance in heart-failure patients [2].
  
  What is missing is a pooled analysis or a Western regulatory assessment. The claim rests on one narrative review's summary [2]. ^[2]

• Exercise performancePossibly helps

  The largest synthesis is a 2025 meta-analysis of 23 randomized trials, 69 comparisons and 308 participants [19].
  
  A single acute dose produced a small-to-moderate pooled effect on overall performance — Hedges' g = 0.25 (95% CI 0.10–0.39) [19].
  
  Gains clustered in aerobic endurance, strength and power, and agility. Anaerobic capacity and muscular endurance stayed inconsistent [19].
  
  No dose-response relationship showed up across the commonly used 1–6 g range, which is awkward for anyone trying to pick a number [19].
  
  The sources disagree on emphasis. An earlier narrative review of 19 studies described benefits in oxygen uptake, time to fatigue, muscle damage and recovery [5].
  
  That same review called the effects small and inconsistent, and the 2025 meta-analysis puts a number on exactly that [19]. ^[19]

• Muscle cramps in chronic liver diseasePossibly helps

  A randomized, placebo-controlled crossover trial tested 2 g/day of oral taurine in people with chronic liver disease [18].
  
  Against placebo: seven fewer cramps per fortnight, 89 fewer minutes of cramping per fortnight, and 1.4 points lower on a severity scale, with no adverse effects reported [18].
  
  That was a liver-disease population, not gym-goers. Nothing in the trial says ordinary exercise cramping behaves the same way [18]. ^[18]

• Eye, hearing, nerve and liver claimsPossibly helps

  Cleveland Clinic puts supplementation mainly in one narrow place: people who are critically ill and need extra immune support [9].
  
  For everyone else it says a protein- and amino-acid-rich diet already covers the requirement [9].
  
  The eye-health, hearing, neuroprotection and liver claims rest on animal and test-tube research rather than robust human trials [9][5]. ^[9]

• No standardized clinical taurine-deficiency syndrome exists in humans, and there is no DRI to fall short of [2]
• Retinal degeneration and dilated cardiomyopathy, in people carrying mutations in the taurine transporter gene SLC6A6 (TauT)
• Preterm infants lack some of the enzymes for making taurine from cysteine, so they depend on breast milk or taurine-added formula
• People on long-term intravenous (parenteral) nutrition with no taurine added to the bag
• Long-term vegans and vegetarians measure lower plasma taurine than omnivores, with no confirmed clinical deficiency state established in that group
• Dialysis patients run low for a different reason — 34 µmol/L on hemodialysis and 47 µmol/L on CAPD, against 66 µmol/L in controls, reflecting altered handling rather than dietary shortfall
• Retinal degeneration, cardiac remodeling and impaired glucose handling come from animal models, including taurine-deficiency cardiomyopathy in dogs on certain commercial diets^[2]

• Free taurine — capsules, tablets or powderEssentially every human trial on this page used this form

  Elemental content

  Pure 2-aminoethanesulfonic acid, also called tauric acid, unbound to any protein

  Absorption

  Capsules usually sit at 500–1,000 mg; powder allows a 1,000–2,000 mg single dose.
  
  No comparative absorption data separates the two formats.

  Best for

  Essentially every human trial on this page used this form [2][6]

• Magnesium taurate and other conjugatesPeople who want the magnesium too.

  Elemental content

  Taurine bound to magnesium, or as taurocholic acid — less taurine per gram of product

  Absorption

  Examine's review rates the plain free form the most efficient route to a taurine-specific dose.
  
  No head-to-head human comparison is reported.

  Best for

  People who want the magnesium too. Not a like-for-like swap when a trial dose of taurine is the goal [6]

• Microencapsulated taurineNothing in the cited evidence supports paying extra for it

  Elemental content

  Free taurine inside a coating

  Absorption

  Whether the coating changes anything versus a plain capsule or powder is unclear.
  
  Examine notes no absorption advantage has been shown.

  Best for

  Nothing in the cited evidence supports paying extra for it [6]

• Energy drinksNot really a supplement format.

  Elemental content

  About 750–1,000 mg per 240 mL (8 oz) can

  Absorption

  Liquid, and never on its own — it arrives alongside caffeine and sugar.
  
  The taurine itself is the same synthetic compound sold in capsules.

  Best for

  Not really a supplement format. Mayo Clinic notes the caffeine and sugar, not the taurine, drive the usual concerns [14]

• Dose-related side effects

  Reported at higher intakes: nausea, vomiting, diarrhea, dizziness, tremor and headache [2].
  
  Gastrointestinal upset was the only adverse effect noted at the 3 g/day benchmark dose [2].
  
  A few case reports also mention liver pain [5]. ^[2]

• Renal failure — probably a contraindication

  Taurine is normally cleared by the kidneys, so failing kidneys let it pile up [3].
  
  A small hemodialysis trial at 100 mg/kg/day — roughly seven cans' worth of a taurine-containing energy drink — drove plasma and muscle taurine to extreme levels [3].
  
  Two of four evaluable patients stopped early with dizziness and non-rotatory vertigo. Symptoms resolved within 24 hours of discontinuation [3].
  
  A cardiovascular physiology commentary in Hypertension states plainly that renal failure is probably a contraindication for taurine supplements [4]. ^[3]

• Pregnancy, breastfeeding, bipolar disorder, epilepsy

  The same 2023 review names pregnant and lactating women, and people with bipolar disorder, epilepsy or kidney problems, as groups who should ask a clinician first [2].
  
  That is a caution built on absent data rather than on a documented harm signal [2]. ^[2]

• Blood-pressure and other cardiovascular drugs

  The 2023 Nutrients review flags stacking taurine on top of medication doing the same job, blood-pressure-lowering drugs in particular [2].
  
  It extends the same caution to calcium-channel blockers, renin-angiotensin-system drugs, and anything acting on heart or central nervous system function [2]. ^[2]

• Antiplatelet and blood-thinning drugs

  Taurine trials sometimes exclude people with a significant clinical bleeding disorder, or those on dual antiplatelet therapy [20].
  
  The reason is mild antiplatelet activity seen in vitro in at least one study — a theoretical caution, not a risk established in controlled human trials [20]. ^[20]

• The cytochrome P450 claim does not check out

  Healthline states that taurine acts as a cytochrome P450 inhibitor, implying interference with antidepressants, antiepileptics, warfarin and statins [5].
  
  The paper it cites for that is a general review of CYP450 mechanism-based inhibition that never mentions taurine anywhere [5].
  
  So the claim is unverified rather than established. It stays visible here because the warning circulates widely, and a reader deserves to know what is behind it. ^[5]

Taurine is an animal-food nutrient almost exclusively. Meat, poultry, fish, shellfish and dairy carry it; plant foods carry essentially none, seaweed excepted [12][11].

Per 100 g, from the food table in the 2023 Nutrients review [2]: dried nori (Pyropia tenera) 979 mg, raw scallops 827 mg, raw mussels 655 mg.

Still high: dried Porphyra haitanensis seaweed 646 mg, raw clams 520 mg, raw oysters 507 mg, raw octopus 388 mg, raw squid 356 mg [2].

Poultry and fish sit mid-table — raw dark turkey meat 306 mg, raw dark chicken meat 169 mg, raw white fish 151 mg [2].

Land meat drops sharply: raw pork 61 mg, salami 59 mg, baked ham 50 mg, raw dark lamb 47 mg, raw beef 43 mg, canned tuna 42 mg, raw shrimp 39 mg [2].

Dairy and eggs are near the floor — goat's milk 6.8 mg, egg yolk 3.7 mg, yogurt 3.3 mg, cow's milk 2.4 mg, ice cream 1.9 mg [2].

A 2020 review in Amino Acids estimates that about 30 g of dry beef covers a healthy 70 kg adult's daily taurine and carnosine needs [12].

Diet pattern moves intake a long way. Healthline puts a typical American omnivore at 123–178 mg/day, against roughly 17 mg/day on a lacto-ovo vegetarian diet [5].

The vegan numbers disagree between sources. A vegan-nutrition reference reports directly measured intakes of 76 mg/day in omnivore men and none detected in vegan men [11].

Both sources agree on the direction, not the figure — read the exact milligrams as method-dependent [5][11].

Energy drinks are a genuine dietary source too, typically 750–1,000 mg per 240 mL can [2].

Timing evidence exists for exercise and essentially nowhere else.

A narrative review of 19 studies points to 1–3 g taken 1–3 hours before exercise, kept up for at least 6–21 days [5]. Examine's summary is blunter: roughly 60 minutes beforehand [6].

For general health use, no human trial has compared morning with evening dosing [2].

The bedtime idea rests on taurine activating GABA(A) receptors, a mechanism it shares with some calming compounds [16].

The only controlled sleep experiment located was in fruit flies, where a 0.75% taurine dose raised total sleep about 50% while caffeine lowered it [16].

Drosophila is not a person. Read that as a mechanism, not as a dosing schedule.