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Taurine is a sulfur-containing amino sulfonic acid, related to the amino acids but not used to build proteins, and it is especially abundant in the brain, heart, muscle, and retina. Beyond its familiar roles in bile-salt formation, osmoregulation, and antioxidant defense, cells use taurine to chemically modify mitochondrial transfer RNA, attaching it at the anticodon wobble position so that certain codons are read correctly; this was the first evidence that taurine is a building block of a biological macromolecule, and losing the modification is the molecular cause of the mitochondrial diseases MELAS and MERRF. Obtained in the diet mainly from meat and seafood, it is a common ingredient in energy drinks and dietary supplements and is studied for cardiovascular, metabolic, and aging-related effects.
- cheap, forgiving and easy to justify daily
- quiet GABA-like calm without knocking you out
- real support for heart and exercise physiology
- antioxidant duty in brain, heart, muscle and retina
- your mitochondria literally build it into their tRNA
- almost no side effects at a gram or two
- Digestive upset is possible in some people
- Often combined with caffeine in energy drinks
- People with medical conditions should seek advice
Overview
Taurine is an organic compound that carries a sulfonic acid group in place of the carboxylic acid group found in ordinary amino acids, and unlike them it is not built into proteins [1]. Even so, it is one of the most plentiful free amino acids in many tissues, including the brain, retina, heart, and skeletal muscle [1]. It was first isolated from ox bile in 1827, and its name derives from the Latin word for bull; in the body it is made chiefly in the liver from the sulfur-containing amino acid cysteine [1].
Taurine serves a range of physiological roles, among them helping to regulate cell volume, modulating calcium levels, and providing a building block for the bile salts used in digestion [1]. Its importance became clear through animal studies: cats, which cannot make enough of it, develop retinal degeneration and a form of heart failure when their diet lacks taurine, findings that established it as an essential nutrient for that species and led to its routine addition to cat food [3][4]. In cats the deficiency-related cardiomyopathy could be reversed by restoring taurine, demonstrating a direct link between the compound and heart function [3].
In humans taurine is generally regarded as non-essential because the body can synthesize it, and no formal recommended intake exists [1]. It is nonetheless the subject of active research; a widely noted 2023 study reported that circulating taurine falls with age in several species and that supplementation extended healthy lifespan in mice and improved measures of health in monkeys, prompting calls for human trials [2]. Taurine is sold as a dietary supplement and is a familiar component of energy drinks, and food-safety authorities have reviewed its use at commonly consumed levels; much of the human evidence for benefit remains preliminary [1][2].
Mechanism
Taurine's actions in the body are broad and not fully mapped, but several mechanisms are well described [1]. As an organic osmolyte it helps control the movement of water and the volume of cells, and it contributes to the stability of cell membranes [1]. It modulates the handling of calcium within cells, which shapes its influence on the excitable tissues of the heart, muscle, and nervous system, and it is joined to bile acids in the liver to form the bile salts that aid fat digestion [1].
In the retina and elsewhere it acts as a cytoprotectant, shielding cells from stress-related damage, which is reflected in the retinal degeneration that appears when it is deficient [1][3]. Research into aging has proposed further effects, reporting that restoring taurine can reduce cellular senescence, limit DNA damage, protect mitochondria, and lessen the low-grade inflammation associated with growing older, though these findings come largely from animal models [2]. Taurine also interacts with inhibitory neurotransmitter systems in the brain, although a dedicated taurine receptor has not been firmly identified [1].
receptor fingerprint
/ glycine receptorsmodulates
Calcium handling (heart, muscle)supports
reduces
Cell hydration (osmolyte)acts as
Dosingtypical ranges, not medical advice
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Safetyrisks and cautions, not medical advice
Taurine is one of the safer supplements out there, very well tolerated even at multi-gram doses, with mild digestive upset or occasional drowsiness the only common issues. It is not a stimulant despite the energy-drink association; if anything it is calming. There are no meaningful contraindications for healthy people, though anyone pregnant, nursing, or on medication should check with a clinician. Not medical advice.
Subjective profileweighing the evidence above
Cheap, forgiving and one of the easier supplements to justify: mild calming, genuine support for heart and exercise physiology, and almost nothing in the way of side effects at a gram or two a day. The effect is quiet rather than dramatic, which is fine.
Where to buy
2 other outlets
Suppliers
Vendors carrying Taurine, with live product details and codes. Links are affiliate links that support the wiki at no cost to you.
RUPharma🌐
Taurine
Amazon
Taurine
iHerb
Taurine
Research
- 1978first citedTaurine: an essential nutrient for the cat.
- 2018meta-analysisThe Effects of an Oral Taurine Dose and Supplementation Period on Endurance Exercise Performanc…
- 2021most active year5 papers
- 2023most recentTaurine deficiency as a driver of aging.
- 1.Review: taurine: a "very essential" amino acid.
- 2.Taurine deficiency as a driver of aging.
- 3.Myocardial failure in cats associated with low plasma taurine: a reversible cardiomyopathy.
- 4.Taurine: an essential nutrient for the cat.
- 5.Taurine: a conditionally essential amino acid in humans? An overview in health and disease
- 6.Taurine and its analogs in neurological disorders: Focus on therapeutic potential and molecular mechanisms
- 7.Activation of human alpha1 and alpha2 homomeric glycine receptors by taurine and GABA
- 8.Modulation of calcium channels by taurine acting via a metabotropic-like glycine receptor
- 9.Perinatal taurine exposure affects adult arterial pressure control
- 10.The Effects of an Oral Taurine Dose and Supplementation Period on Endurance Exercise Performance in Humans: A Meta-Analysis
- 11.Energy Drinks and Sports Performance, Cardiovascular Risk, and Genetic Associations; Future Prospects
- 12.Acute effects of energy drinks in medical students
30 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
What is taurine?
It is an amino acid found naturally in the body with calming, GABA-like effects. It supports the heart, exercise and nervous system relaxation.
Why is it in energy drinks?
It is added partly for its role in nervous system and cardiovascular function. It is thought to balance some stimulant effects.
Is it stimulating or calming?
It tends to be calming rather than stimulating, despite its energy-drink association. Some use it in the evening for relaxation.
Is it well tolerated?
It is generally very well tolerated. High intakes may occasionally cause mild digestive upset.
Limitations of the evidence
- Long-term effects of high intake are not fully studied
Adverse effects
- Digestive upset is possible in some people
- Often combined with caffeine in energy drinks
- People with medical conditions should seek advice
Notes and cautions
- Considered well tolerated at commonly used amounts