TUDCA Benefits: What Human Studies Show

TUDCA has been studied in people mainly for liver conditions, gallstones, indigestion after gallbladder removal and insulin sensitivity, with encouraging but mostly small studies. Many other benefits you will read about online, from the brain to the eyes, come from cell and animal research that has not yet been confirmed in people.

---

Search for TUDCA benefits and you will find long lists: liver repair, thinner bile, dissolved gallstones, brain protection, better eyesight, clean arteries and weight loss. Some of these have been studied in people. Many come from experiments in cells and mice, and the lists rarely tell you which is which.

This guide sorts each benefit by the research behind it. It names who was studied, what was measured and how much research stands behind each finding. Dr.Primal sells TUDCA, so we have tried to be plain about where the evidence is encouraging and where it has not yet been confirmed.

What Are the Benefits of TUDCA?

The benefits of TUDCA that have been studied in people are mostly about bile and the liver. In studies, it lowered liver enzymes in people with liver conditions, changed the makeup of bile in people with gallstones, eased indigestion faster in the first month after gallbladder removal, and raised insulin sensitivity in a small group of adults with obesity [1, 2, 3, 4]. It is a licensed medicine for cholesterol gallstone problems in Italy and Turkey [5, 6].

Most of those studies were small, and most measured laboratory results rather than how people felt. They were also done in people with a specific condition, so the findings don't automatically carry over to healthy adults taking a supplement. Our review of the human research on TUDCA appraises 27 studies in digestive and liver health one by one.

TUDCA Benefits at a Glance: What Has Been Studied in People?

The table below lists the benefits most often claimed for TUDCA, who was studied, and what the studies found. The research level describes how much evidence there is, not whether TUDCA works. A low level means a finding has not yet been confirmed, not that it has been disproved.

Benefit claimed	Who was studied	What was found	Research level
Liver blood tests	People with primary biliary cholangitis	Liver enzymes fell; similar to the standard prescription bile acid on the main measure, though two other enzymes fell more on it	Moderate
Liver enzymes	People with chronic hepatitis C	Fell more than on placebo over six months	Early
Gallstones	People with non-calcified gallstones	Bile became less saturated with cholesterol; a prescription bile acid dissolved stones more often	Early
Insulin sensitivity	20 adults with obesity	Rose about 30% on TUDCA and not on placebo, over four weeks	Early
Indigestion after gallbladder removal	203 adults after surgery	Eased faster in the first month; the untreated group caught up by months two and three	Preliminary
Ulcerative colitis	14 people, no comparison group	Disease scores fell over six weeks	Preliminary
Fatty liver, bloating, IBS, bile reflux	No published treatment study in people	Not yet tested as a treatment	Not yet studied
ALS (brain and nerves)	People with ALS	A large phase 3 trial fell short of its goal	Tested in people
Eyes, kidneys	Mainly cells and animals	Not confirmed in people	Not yet studied

No use of TUDCA has yet reached the strongest level of evidence, which needs several large, randomized, blinded trials measuring outcomes that matter to patients. The sections below explain each row.

What Is TUDCA?

TUDCA, short for tauroursodeoxycholic acid, is a hydrophilic, or water-loving, bile acid that occurs naturally in small amounts in human bile [7, 5]. It is the taurine-bound form of ursodeoxycholic acid (UDCA), and the two together make up only about 2% of the human bile acid pool [7]. Taken by mouth, it is absorbed and joins the bile acids that circulate between your gut and liver [8].

In the US it is sold as a dietary supplement, while in Italy it is a prescription medicine [9]. Our guide to what TUDCA is covers how it is made and how it works.

Does TUDCA Help After Gallbladder Removal?

One study has tested TUDCA after gallbladder removal, and its result was encouraging but not yet confirmed. In 203 adults who had indigestion after surgery, those taking 500 mg a day improved faster, with a significant difference at one month [3]. By months two and three, the untreated group had caught up, and symptoms were at a similar level in both groups.

The comparison group took no placebo, and the published summary gives no symptom scores. However, it remains the only trial of TUDCA in people without a gallbladder, and its finding of faster early improvement is a reasonable basis for a larger, placebo-controlled study. Turkey's medicine label lists "biliary dyspepsia with or without cholecystectomy" among TUDCA's uses [6].

The reasoning behind using TUDCA after surgery is about timing. Without a gallbladder, bile flows directly into the small intestine instead of being stored [10], and shortly after a fat-rich meal there is far less bile acid on hand than in people who still have one [11]. That is why Dr.Primal's TUDCA is made for life after gallbladder removal and taken with meals, to support healthy bile flow and fat digestion when richer meals feel heavy. Our guide to TUDCA after gallbladder removal goes further.

Is TUDCA Good for the Liver?

TUDCA has the most human research in liver conditions, where it has generally lowered liver enzymes. In a placebo-controlled trial of 150 people with chronic hepatitis C, liver enzymes fell more on 500 or 750 mg a day than on placebo over six months [1]. In primary biliary cholangitis, a chronic bile duct disease, enzymes fell at doses of 500 to 1,500 mg a day [12].

The largest trial in liver disease compared TUDCA with UDCA, the standard prescription bile acid for primary biliary cholangitis, in 199 people for 24 weeks. On the main measure, 76% responded on TUDCA and 81% on UDCA, a similar result, although two other liver enzymes fell more on UDCA [13]. Two very small studies in cirrhosis reported better liver tests, without a proper comparison between groups [14, 15].

These were people with diagnosed liver disease, under medical care. For fatty liver, one of the most common liver conditions in the US [16], we found no published study testing TUDCA as a treatment, and in a four-week trial liver fat did not change [4]. If a blood test shows raised liver enzymes, our guide to elevated liver enzymes explains the usual causes and next steps.

Is TUDCA Good for Gallstones?

TUDCA is licensed in Italy for cholesterol gallstone problems, and in one study it made bile less saturated with cholesterol, but TUDCA supplements are not a gallstone treatment. In 33 people with non-calcified gallstones, cholesterol saturation in bile fell as the dose rose, from 147% to about 80% [17]. That study measured bile chemistry, not whether stones disappeared.

In the only randomized comparison that measured stone dissolution, 31 people took TUDCA or UDCA for six months, and UDCA dissolved stones completely more often [18]. In the US, the prescription form of UDCA is called ursodiol. It is a long-established medicine that doctors prescribe routinely, for example for some small gallstones when surgery isn't the right choice, so being offered it is common and nothing to be alarmed by [19]. Whether any gallstone treatment suits you is a decision to make with your doctor, and TUDCA is not a substitute for it.

Does TUDCA Help Insulin Sensitivity or Weight?

In one small trial, TUDCA raised insulin sensitivity, but it has not been tested for weight loss. Twenty adults with obesity took 1,750 mg a day or placebo for four weeks, and the insulin sensitivity of the liver and muscles rose about 30% on TUDCA and not on placebo [4]. Liver fat and liver enzymes did not change in that time.

Four weeks in 20 people is a starting point rather than an answer, and the trial measured insulin sensitivity, not weight. We found no study in people that tested TUDCA for weight loss. If weight has crept up since surgery, our guide to weight gain after gallbladder removal covers what research shows about why.

Does TUDCA Help the Gut?

The gut research on TUDCA is at an early stage. In an open-label study of 14 people with ulcerative colitis, average disease scores fell over six weeks, but there was no comparison group and the results have not yet been peer reviewed [20]. Without a comparison group, some of that improvement could have happened anyway.

We found no published study in people testing TUDCA for bloating, IBS or bile reflux. In online gut-health forums, some people describe meals sitting more lightly on it and others notice no change or new digestive upset, but personal reports can't separate TUDCA's effect from diet changes and the natural ups and downs of symptoms.

What About the Brain, Eyes, Heart and Kidneys?

Most of the research behind these benefits comes from cells and animals, not from trials in people. A review of TUDCA's uses outside the liver describes a large body of laboratory work in models of brain, eye and other diseases [7]. In the lab, TUDCA is studied as a chemical chaperone, a molecule that helps cells cope with stress from misfolded proteins [21]. In the one placebo-controlled trial that measured those stress markers in people, in muscle and fat tissue, they did not change over four weeks [4].

Results in animals often don't carry over to people, and the most-watched test so far shows why. In a large phase 3 trial in ALS, a disease of the nerves that control movement, TUDCA did not show the hoped-for benefit [22]. A prescription drug for ALS that combined taurursodiol (TUDCA) with another compound was approved in the US in 2022. After its own large trial did not meet its goals, it was taken off the market, and its approval was formally withdrawn in 2025 [23].

For the eyes and kidneys, we found no published trial in people. For blood vessels, two single-dose studies in healthy young adults disagreed: one found TUDCA prevented a short-lived dip in artery function after a sugary drink [24], and the other found no change [25]. Neither studied heart disease, so these claims are hypotheses for now.

Which TUDCA Claims Are Myths?

A few claims about TUDCA go further than any evidence in people. These are the ones worth questioning when you read a product page or watch a video.

1. "TUDCA dissolves gallstones as well as the prescription option"

In the only comparison that measured stone dissolution, the prescription bile acid dissolved stones completely more often than TUDCA [18]. TUDCA's Italian licence for gallstone problems is for use as a medicine under a doctor's care [5], and as a supplement it should not be relied on to clear stones.

2. "TUDCA detoxes or cleanses the liver"

We found no study that measured a "detox" from TUDCA. The liver clears substances on its own, and detox programs in general have little good evidence behind them [26]. Our liver detox myth-check explains why.

3. "TUDCA is FDA approved"

Supplements don't need FDA approval before they are sold [27]. The only FDA-approved product containing TUDCA was the ALS combination drug, which has since been withdrawn [23].

4. "TUDCA has been used for thousands of years"

That history belongs to bear bile, which is unusually rich in TUDCA [28]. Bear bile was first recorded in an official Chinese medicine text in 659 AD, for complaints such as fever, convulsions and eye problems rather than the liver [29]. TUDCA can also be made in a lab, which is how Dr.Primal's is made, with no bears involved.

Is TUDCA Safe?

In published trials, TUDCA has been well tolerated at 500 mg to 2 g a day for up to about a year, with mostly mild digestive side effects such as looser stools [13, 30, 31]. In a year-long placebo-controlled trial in people with ALS, side effects were no more common with TUDCA than with placebo, and mild diarrhea occurred in 2 of 15 people on TUDCA and 2 of 14 on placebo [30].

The Italian medicine label says it should not be taken in pregnancy, while breastfeeding, with an active peptic ulcer, with frequent gallbladder attacks, or with acute inflammation or blockage of the gallbladder or bile ducts, and that it should be kept two hours apart from bile acid binders such as cholestyramine [5]. If you take prescription medicines, check with your doctor or pharmacist first. Our TUDCA safety review lists the side effects reported in the human studies.

How Do People Take TUDCA?

The medicine labels direct TUDCA in divided doses after meals [5], and studies in adults have used 500 mg to 2 g a day [3, 30]. Our guide to when to take TUDCA covers meals, morning or night, and spacing it from other medicines.

In Summary: TUDCA Benefits

The human research on TUDCA centers on liver blood tests in people with liver conditions and on changes in bile chemistry, with smaller and earlier findings for insulin sensitivity, indigestion after gallbladder removal and ulcerative colitis. Most of the brain, eye, heart and weight benefits you will read about online come from cells and animals.

For someone without a gallbladder, the case for TUDCA rests on supporting healthy bile flow and fat digestion at meals, with one encouraging early study behind it. If you are working out what is behind your own digestive symptoms, our digestion quiz is a quick way to put your symptoms and habits in order.

This article is for general education and is not a substitute for advice from your doctor. TUDCA is sold as a dietary supplement. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.