Overview
TUDCA is tracked as a supplement in Milligram's compound library. Taurine-conjugated hydrophilic bile acid.
With a half-life of ~6 hours, TUDCA requires daily administration in most observed protocols. Taken orally, it has a bioavailability of approximately 95% via its primary route.
Half-life approximately 6 hours. High oral bioavailability. Undergoes enterohepatic recirculation. One-compartment model.
Mechanism of Action
TUDCA's pharmacological activity involves the following key pathways:
Primary Mechanism
TUDCA exerts its effects through its established pharmacological pathway. Its mechanism has been characterized in published research.
Bioavailability Profile
TUDCA has high oral bioavailability, which influences dosing strategy and administration timing.
Dosing Protocols
The following protocols represent commonly observed dosing patterns. These are observational summaries, not recommendations.
Dose
250 mg/day
Route
Oral
Frequency
Once daily
Duration
Ongoing
Dose
500 mg/day
Route
Oral
Frequency
Once daily
Duration
Ongoing
Frequently Asked Questions
What is TUDCA and how does it work?
TUDCA (Tauroursodeoxycholic Acid) is a naturally occurring hydrophilic bile acid — the taurine-conjugated form of ursodeoxycholic acid (UDCA). It is produced endogenously in small quantities and protects cells by reducing endoplasmic reticulum (ER) stress, stabilizing mitochondrial membranes, and preventing the accumulation of toxic hydrophobic bile acids in the liver. It is classified as a chemical chaperone that helps proteins fold correctly under cellular stress.
Why is TUDCA used for liver support?
TUDCA counteracts bile acid toxicity by replacing hydrophobic bile acids with its hydrophilic structure, reducing direct chemical damage to liver cell membranes. Randomized controlled trials have demonstrated that TUDCA treatment significantly lowers serum liver enzymes (ALT, AST, and ALP), which are markers of hepatic inflammation. It is commonly used alongside hepatotoxic oral compounds to support liver function during protocols that stress the liver.
What is the difference between TUDCA and UDCA?
UDCA (ursodeoxycholic acid) is the unconjugated parent compound, while TUDCA is its taurine-conjugated form. TUDCA has greater water solubility and is more resistant to degradation by gut bacteria, potentially offering improved bioavailability. Both share the same core mechanism of replacing toxic bile acids, but TUDCA also has additional documented effects on ER stress reduction and cellular protein folding that UDCA does not demonstrate as strongly.
How much TUDCA should be taken for liver support?
Doses of 250–500 mg/day are commonly observed for general liver support and maintenance. When used alongside hepatotoxic oral compounds, doses of 500–1000 mg/day are more frequently reported. Clinical trials studying liver disease have used approximately 10 mg/kg body weight per day. TUDCA is typically taken with food to align with natural bile acid release during digestion.
How long does it take for TUDCA to improve liver enzymes?
Improvements in serum liver enzyme levels (ALT, AST) have been observed within 2–4 weeks of consistent supplementation in clinical studies. The bile acid displacement effect begins rapidly, but measurable changes in hepatic markers require time for the liver to clear accumulated damage. TUDCA is commonly started 1–2 weeks before introducing hepatotoxic compounds and continued throughout their use.
Are there side effects of TUDCA supplementation?
TUDCA is generally well-tolerated across clinical studies. The most commonly reported effects include mild diarrhea and gastrointestinal discomfort, which are typically transient and dose-dependent. These GI effects are consistent with its bile acid nature, as bile acids draw water into the intestines. Clinical data supports safety for treatment durations up to one year, though longer-term data is limited.