TUDCA (Tauroursodeoxycholic Acid): Benefits, Dosage, Safety And Research

TUDCA (tauroursodeoxycholic acid) is a bile acid, the taurine-bound form of ursodeoxycholic acid (UDCA), that is sold as a dietary supplement for liver and cellular health. Most of its exciting effects come from animal and cell studies, where it reduces a type of cell stress called endoplasmic reticulum (ER) stress.^[1][4] In people, the evidence comes from small trials in specific medical conditions, and the largest trial in ALS did not show a benefit, so a TUDCA supplement should be viewed as experimental rather than proven.^[7]

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What Is TUDCA And How Does It Work?

Bile acids are made in the liver from cholesterol and help digest fats. Ursodeoxycholic acid (UDCA, also called ursodiol) is a minor bile acid in humans but a major one in bears. It is more water-soluble and less toxic to cells than other bile acids, and as a prescription drug it is used to dissolve cholesterol gallstones and to treat certain cholestatic liver diseases.^[2] TUDCA is UDCA linked to the amino acid taurine.

Researchers became interested in TUDCA because it acts as a “chemical chaperone,” helping cells handle misfolded proteins and reducing ER stress, a cellular stress response linked to obesity, insulin resistance and neurodegeneration. In a 2006 Science study, TUDCA and a related compound normalized blood sugar, restored insulin sensitivity and resolved fatty liver in obese and diabetic mice.^[4] A 2022 review describes anti-apoptotic, antioxidant, mitochondrial and anti-inflammatory effects of TUDCA in animal models of Alzheimer’s, Parkinson’s, Huntington’s disease, ALS and stroke.^[1]

The important caveat: these mechanisms were demonstrated mainly in cells and animals. Very few have been confirmed in people.

TUDCA Vs UDCA

UDCA is the prescription drug; TUDCA is its taurine-conjugated form sold as a supplement in the US. In a small crossover study of 12 women with primary biliary cirrhosis given 750 mg per day of each for two months, TUDCA was better absorbed than UDCA and underwent less conversion to more toxic, hydrophobic bile acids such as lithocholic acid.^[3] In a larger trial of 199 patients with primary biliary cholangitis, TUDCA and UDCA (250 mg three times daily for 24 weeks) produced similar improvements in liver blood tests, with less itching in the TUDCA group.^[11] Those were patients with diagnosed liver disease under medical care, so the results do not tell us what TUDCA does in healthy supplement users.

TUDCA Benefits: What The Research Shows

Below, each potential benefit is rated by the strength of the human evidence. We separate human trials from animal research, because most online claims about TUDCA blur the two.

Insulin Sensitivity (Evidence: Preliminary)

The most cited human metabolic study randomized 20 obese adults (average BMI 37) to TUDCA 1,750 mg per day or placebo for four weeks. Using a gold-standard clamp test, liver and muscle insulin sensitivity rose about 30% with TUDCA but not with placebo, and muscle insulin signaling improved. Insulin sensitivity in fat tissue did not change, and markers of ER stress in muscle and fat were not significantly altered.^[5] It is a well-designed but tiny, short study that has not been followed by larger trials. It does not show that TUDCA prevents or treats diabetes.

TUDCA And Liver Support: What The Research Actually Covers (Evidence: Limited)

“TUDCA liver support” is one of the most common reasons people buy it, often to offset the liver strain of alcohol or oral anabolic steroids. The human liver research does not cover those uses. It consists of trials in people with diagnosed cholestatic liver disease, where TUDCA lowered liver enzymes in a manner similar to the prescription drug UDCA:^[11][12]

• In a 24-patient dose-response study, 500, 1,000 or 1,500 mg per day for six months all reduced liver enzyme levels within a month, with further reductions over time at the two higher doses.^[12]
• In the 199-patient comparison described above, TUDCA performed similarly to UDCA on liver blood tests.^[11]

Lower liver enzymes in these patients are a marker, not proof of better long-term outcomes, and these conditions require medical treatment, not self-directed supplements. There is no good evidence that TUDCA protects a healthy liver from alcohol, medications or steroids. If you have signs of liver problems or abnormal liver tests, see a doctor rather than self-treating.

ALS And Neuroprotection (Evidence: Not Supported In Larger Trials)

TUDCA’s reputation as a neuroprotective nootropic comes largely from ALS research, and the story is a cautionary one.

• The pilot: In a 2016 phase 2 study, 34 people with ALS already taking riluzole received TUDCA 1 gram twice daily or placebo for 54 weeks. More TUDCA patients met the responder definition (87% vs 43%), and their functional decline was slower. The authors called the data preliminary.^[6]
• The follow-up: TUDCA-ALS, a multicenter phase 3 trial across Europe, tested TUDCA as an add-on to riluzole over 18 months.^[8] In March 2024, the investigators reported that it did not meet its primary goal of slowing disease progression and showed no significant differences on secondary outcomes.^[7]
• The combination drug: Sodium phenylbutyrate-taurursodiol (a fixed combination including TUDCA) slowed functional decline modestly over 24 weeks in the 137-person phase 2 CENTAUR trial, with mainly gastrointestinal side effects.^[9] It received FDA approval, but the phase 3 PHOENIX trial showed no benefit at 48 weeks, and the company moved to withdraw it from the US and Canadian markets.^[10]

Animal studies in Alzheimer’s, Parkinson’s and Huntington’s models remain interesting,^[1] but there is no human evidence that TUDCA improves memory, focus or brain health in healthy people. We do not consider it a nootropic in any evidence-based sense.

Other Claimed Benefits (Evidence: Preliminary Or Animal-Only)

You will see TUDCA promoted for eye health, gut health, fat loss and muscle preservation. These claims rest on cell and animal research or on extrapolation from the ER stress mechanism.^[1][4] Treat them as hypotheses.

TUDCA Dosage: Studied Doses

Purpose	Dose	Duration	Study
Insulin sensitivity, obese adults	1,750 mg/day	4 weeks	Kars 2010[5]
ALS (add-on to riluzole)	1,000 mg twice daily (2,000 mg/day)	54 weeks	Elia 2016[6]
Primary biliary cholangitis (vs UDCA)	250 mg three times daily (750 mg/day)	24 weeks	Ma 2016[11]
Primary biliary cirrhosis, dose-finding	500, 1,000 or 1,500 mg/day	6 months	Crosignani 1996[12]
Bile acid absorption (vs UDCA)	750 mg/day	2 months	Invernizzi 1999[3]

Nootropics Depot suggests one 500 mg capsule daily.^[13] That is below the doses in the metabolic and ALS trials. In the dose-finding study, the authors suggested about 10 mg per kilogram of body weight per day for long-term research in liver disease patients.^[12] There is no established dose for healthy people, and no long-term safety data in that group.

TUDCA Powder Vs Capsules

TUDCA powder is cheaper per gram but has a very bitter taste and needs a milligram scale for accurate dosing. Capsules are easier to dose consistently. Bulk TUDCA powder from unknown suppliers carries a higher risk of mislabeled purity, so look for a certificate of analysis either way.

Forms And What To Look For

• TUDCA, not UDCA. UDCA (ursodiol) is a prescription drug in the US; supplements should contain tauroursodeoxycholic acid.^[2]
• Sourcing. Ask the seller how its TUDCA is produced, and avoid any product derived from bear bile.
• Third-party testing. Look for a certificate of analysis confirming identity and purity.
• Clear dosing. Milligrams of TUDCA per capsule, with no proprietary blends.

TUDCA Side Effects And Safety

In clinical trials, TUDCA was generally well tolerated. In the ALS pilot, adverse events did not differ between TUDCA and placebo,^[6] and in the liver disease comparison, adverse event rates were similar to UDCA.^[11] In the dose-response study, diarrhea was the only side effect reported.^[12] Gastrointestinal effects were also the main adverse events with the TUDCA-containing ALS drug, which included another active ingredient.^[9]

For context, its parent compound ursodiol is described by LiverTox as generally well tolerated, with uncommon side effects including fatigue, nausea, headache and weight gain, and rare instances of worsening liver disease in people with pre-existing cirrhosis.^[2]

Because all of these data come from short trials in patients under medical supervision, the long-term safety of TUDCA in healthy supplement users is unknown.

Drug Interactions And Who Should Avoid It

We found no formal drug interaction studies for TUDCA supplements. Practical cautions:

• People with liver or gallbladder disease, including cirrhosis, bile duct blockage or gallstones, should use TUDCA only under medical supervision. Ursodiol has rarely been linked to worsening liver disease in people with pre-existing cirrhosis.^[2]
• People taking prescription bile acid medications such as ursodiol should not add TUDCA without their doctor’s input, since the two are closely related.^[2][3]
• Pregnant or breastfeeding people: safety has not been established for supplement use.
• Anyone using TUDCA to “protect” the liver while taking oral steroids, high alcohol intake or hepatotoxic drugs: there is no evidence that it prevents liver injury, and this can create false reassurance. Talk with your doctor and get liver tests.

For general guidance on supplement safety, see our guide to nootropic side effects.

How TUDCA Fits With Other Supplements

TUDCA is not a cognitive enhancer, and we would not add it to a nootropic stack for focus or memory. If your goals are cognitive, start with better-studied ingredients such as creatine, citicoline or bacopa monnieri, and read our overview of the best nootropics. People interested in metabolic health may also be curious about curcumin phytosome, which has its own (separate) evidence base. Browse all our ingredient guides.

Where To Buy TUDCA

If you decide to try TUDCA after talking with your doctor, choose a product with a clearly stated dose and third-party purity testing. Nootropics Depot sells TUDCA capsules at 500 mg each and publishes batch certificates of analysis.^[13] We currently link to Nootropics Depot’s authorized Amazon store; buy only from listings marked “Sold by Nootropics Depot.” See our Nootropics Depot review for more on the company.

TUDCA FAQs

What Does TUDCA Do?

TUDCA is a bile acid that reduces ER stress and cell death in laboratory and animal studies.^[1][4] In humans, small trials show it can improve insulin sensitivity in obese adults over four weeks and lower liver enzymes in people with cholestatic liver disease.^[5][11]

Is TUDCA Good For The Liver?

It has been studied in people with specific liver diseases, where it performed similarly to the prescription drug UDCA on liver blood tests.^[11] There is no good evidence that it protects a healthy liver from alcohol, drugs or steroids, and liver disease needs medical care.

What Is The Difference Between TUDCA And UDCA?

TUDCA is UDCA bound to taurine. In a small study it was absorbed better and converted less into toxic bile acids than UDCA.^[3] UDCA (ursodiol) is a prescription drug in the US.^[2]

How Much TUDCA Should I Take?

Trials used 750 to 2,000 mg per day in patients under supervision.^[5][6][11] Nootropics Depot’s label suggests 500 mg once daily.^[13] There is no established dose for healthy people, so discuss it with your doctor.

Does TUDCA Help With ALS?

A small pilot was encouraging, but the larger phase 3 TUDCA-ALS trial did not show a benefit, and ALS charities advised anyone taking TUDCA to talk with their neurologist.^[6][7]

What Are The Side Effects Of TUDCA?

Diarrhea and other gastrointestinal effects are the most commonly reported.^[9][12] Long-term safety in healthy users has not been studied.

Is TUDCA A Nootropic?

No. Despite neuroprotection research in animals, there are no human studies showing cognitive benefits, and the main human neurological trial was negative.^[1][7] See what are nootropics for how we define the category.

References

1. Khalaf K, et al. Tauroursodeoxycholic acid: a potential therapeutic tool in neurodegenerative diseases. Transl Neurodegener. 2022;11(1):33. PubMed
2. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Ursodiol (Ursodeoxycholic Acid). National Institute of Diabetes and Digestive and Kidney Diseases. LiverTox
3. Invernizzi P, et al. Differences in the metabolism and disposition of ursodeoxycholic acid and of its taurine-conjugated species in patients with primary biliary cirrhosis. Hepatology. 1999;29(2):320-327. PubMed
4. Ozcan U, et al. Chemical chaperones reduce ER stress and restore glucose homeostasis in a mouse model of type 2 diabetes. Science. 2006;313(5790):1137-1140. PubMed
5. Kars M, et al. Tauroursodeoxycholic acid may improve liver and muscle but not adipose tissue insulin sensitivity in obese men and women. Diabetes. 2010;59(8):1899-1905. PubMed
6. Elia AE, et al. Tauroursodeoxycholic acid in the treatment of patients with amyotrophic lateral sclerosis. Eur J Neurol. 2016;23(1):45-52. PubMed
7. MND Association. MND charities respond to TUDCA trial results. March 27, 2024. MND Association
8. Lombardo FL, et al. A randomized double-blind clinical trial on safety and efficacy of tauroursodeoxycholic acid (TUDCA) as add-on treatment in patients affected by amyotrophic lateral sclerosis (ALS): the statistical analysis plan of TUDCA-ALS trial. Trials. 2023;24(1):792. PubMed
9. Paganoni S, et al. Trial of sodium phenylbutyrate-taurursodiol for amyotrophic lateral sclerosis. N Engl J Med. 2020;383(10):919-930. PubMed
10. Ketabforoush A, et al. Sodium phenylbutyrate and tauroursodeoxycholic acid: a story of hope turned to disappointment in amyotrophic lateral sclerosis treatment. Clin Drug Investig. 2024;44(7):495-512. PubMed
11. Ma H, et al. A multicenter, randomized, double-blind trial comparing the efficacy and safety of TUDCA and UDCA in Chinese patients with primary biliary cholangitis. Medicine (Baltimore). 2016;95(47):e5391. PubMed
12. Crosignani A, et al. Tauroursodeoxycholic acid for treatment of primary biliary cirrhosis: a dose-response study. Dig Dis Sci. 1996;41(4):809-815. PubMed
13. Nootropics Depot. TUDCA Capsules: Tauroursodeoxycholic Acid (product page). Accessed October 2026. Nootropics Depot