Most people taking TUDCA as a supplement use between 250 and 1,500 mg per day, split into one to three doses. Clinical research has used roughly 10 mg per kilogram of body weight daily, which works out to about 500 to 1,000 mg for most adults. The right dose for you depends on why you’re taking it, and the details of timing, food, and duration all matter for getting the most out of it.
Dosage Ranges by Purpose
TUDCA (tauroursodeoxycholic acid) is a water-soluble bile acid your body produces in small amounts naturally. As a supplement, it’s used across a wide range of doses depending on the goal.
For general liver support, most supplement brands sell capsules in the 250 to 500 mg range, and many users take one capsule once or twice daily. Clinical research paints a clearer picture: a dose-response study on patients with liver disease tested 500, 1,000, and 1,500 mg per day and concluded that roughly 10 mg per kilogram of body weight was the effective target. For a 150-pound person, that’s about 680 mg daily. For someone at 200 pounds, it’s closer to 900 mg.
Studies examining TUDCA for neurological conditions like ALS have used doses at or above 1,000 mg per day. If you’re taking TUDCA for a specific medical condition rather than general wellness, the dose matters more, and it’s worth working with a provider who understands the research.
With Food or Without
TUDCA is closely related to UDCA (ursodeoxycholic acid), and absorption research on UDCA offers the best available guidance. When UDCA was taken with a high-fat meal, total absorption increased by about 21% compared to taking it on an empty stomach. However, the meal also significantly delayed peak blood levels, pushing them back by more than an hour. In the U.S., UDCA tablets are labeled to be taken with food, while European capsule formulations don’t specify.
The practical takeaway: taking TUDCA with a meal that contains some fat will likely improve how much your body absorbs. You don’t need a heavy meal. A normal lunch or dinner with some dietary fat is sufficient. If you’re splitting your dose across the day, pairing each dose with a meal keeps things simple and consistent.
How TUDCA Works in the Body
TUDCA does two main things that explain its popularity. First, it supports bile flow. As a hydrophilic (water-friendly) bile acid, it helps dilute the more toxic, fat-soluble bile acids that can accumulate and damage liver cells when bile flow is sluggish. This is why it’s FDA-approved for use in biliary cirrhosis.
Second, TUDCA reduces a type of cellular stress called ER stress. The endoplasmic reticulum is the part of your cells responsible for folding proteins into their correct shapes. When that system gets overwhelmed, misfolded proteins pile up and trigger a cascade that can lead to inflammation and cell death. TUDCA stabilizes this process by keeping key stress-response proteins from activating. It also protects mitochondria, the energy-producing structures inside cells. These effects are why researchers have studied TUDCA for conditions well beyond the liver, including neurodegenerative diseases and metabolic disorders.
How Long to Take It
There’s no established rule about cycling TUDCA on and off. Clinical trials have used it continuously for six months or longer without requiring breaks. In a large retrospective study of patients taking TUDCA for ALS, the supplement was generally well-tolerated over extended periods, with only about 8% of patients stopping due to side effects.
Some supplement users follow informal cycles of four to eight weeks on, then take a break, particularly when using TUDCA alongside compounds that stress the liver (like oral anabolic steroids). This approach isn’t based on clinical evidence showing that breaks are necessary. It’s more of a precautionary habit. If you’re using TUDCA for ongoing liver support or a chronic condition, continuous use appears safe based on the available research, though periodic bloodwork to check liver enzymes is a reasonable way to monitor how you’re responding.
Side Effects
TUDCA is well-tolerated at standard doses. In a study of 86 patients, the most common side effect was diarrhea, affecting about 14% of participants. Abdominal pain occurred in roughly 6%, and a small number developed mild skin reactions. Side effect rates were similar whether people took less than 1,000 mg daily or higher doses, so digestive issues seem to be an individual sensitivity rather than strictly dose-dependent.
If you experience loose stools after starting TUDCA, try reducing your dose for a week and building back up gradually. Taking it with food can also help minimize stomach discomfort.
TUDCA and Alcohol
One common assumption is that TUDCA protects the liver from alcohol damage in real time. The research here is more complicated than you might expect. A cell study examining liver cells exposed to ethanol and acetaldehyde (alcohol’s toxic byproduct) found that pre-treating cells with TUDCA actually intensified cell damage rather than preventing it. The researchers concluded that the protective effect of TUDCA in alcohol-treated liver cells “remains dubious.”
This doesn’t mean TUDCA is dangerous if you drink occasionally, but it does mean you shouldn’t rely on it as a shield against alcohol’s effects. Taking TUDCA the morning after heavy drinking as a hangover remedy isn’t supported by evidence, and taking it right before or during drinking could theoretically do more harm than good. If liver health is your goal, separating TUDCA doses from alcohol consumption by several hours is the cautious approach.
Who Should Avoid TUDCA
TUDCA should be avoided during pregnancy and breastfeeding. While its close relative UDCA has been used safely in pregnant women for a specific liver condition, TUDCA itself has not been studied in human pregnancies, and there isn’t enough data to confirm its safety.
People taking bile acid sequestrants (medications prescribed to lower cholesterol) should know that these drugs can bind to TUDCA in the gut and reduce how much gets absorbed. If you take both, separating them by at least two to four hours may help, though this hasn’t been specifically studied with TUDCA. There are also potential interactions with insulin and blood sugar-lowering medications, since TUDCA can influence insulin sensitivity. Anyone on diabetes medication should be aware that adding TUDCA could alter how well those drugs work.
People with a complete bile duct obstruction should avoid TUDCA and other bile acids entirely, since the supplement works by promoting bile flow through pathways that are physically blocked in that condition.