TUDCA (Tauroursodeoxycholic Acid)
Also known as: Tauroursodeoxycholic acid, Tauro-UDCA, T-UDCA, bile acid supplement
Effective Dosage
500–2000 mg daily (based on clinical trial doses)
What the Science Says
TUDCA is a naturally occurring bile acid found in small amounts in the human body and produced in larger quantities by gut bacteria. In clinical trials, it has been studied as a supportive treatment for gallstones (500 mg/day) and progressive multiple sclerosis (2 g/day), where it was found to be safe and tolerable, with measurable biological effects on bile acid levels and immune cells. Lab and animal studies suggest it protects cells by reducing endoplasmic reticulum stress, inflammation, and oxidative damage — mechanisms being explored in conditions like ALS, stroke, and epilepsy.
What It Doesn't Do
Not proven to treat or cure any neurological disease in humans. No human evidence it builds muscle, burns fat, or detoxes the liver in healthy people. Animal and cell study results don't automatically translate to humans. No evidence it prevents cancer in people. The ALS trial results are not yet published — don't assume it works based on the trial design alone.
Evidence-Based Benefits
TUDCA is a naturally occurring bile acid found in small amounts in the human body and produced in larger quantities by gut bacteria. In clinical trials, it has been studied as a supportive treatment for gallstones (500 mg/day) and progressive multiple sclerosis (2 g/day), where it was found to be safe and tolerable, with measurable biological effects on bile acid levels and immune cells. Lab and animal studies suggest it protects cells by reducing endoplasmic reticulum stress, inflammation, and oxidative damage — mechanisms being explored in conditions like ALS, stroke, and epilepsy.
Weak EvidenceEffective at: 500–2000 mg daily (based on clinical trial doses)
Source: auto-research
Absorption & Bioavailability
Moderate — TUDCA is a conjugated bile acid that is absorbed via the gut and undergoes enterohepatic recirculation. Pharmacokinetic data from related compound UDCA shows significantly higher blood levels in elderly individuals (2–4x higher peak concentrations) compared to younger adults, suggesting age affects how much reaches circulation.
Red Flags to Watch For
- Most exciting findings (neuroprotection, anti-cancer, embryo development) come from animal or cell studies — not human trials
- The major ALS clinical trial (Phase III) had not published results at time of these papers — efficacy in ALS is unconfirmed
- The MS trial showed no significant differences in clinical or biomarker outcomes — only safety and biological signals
- Elderly users may absorb significantly more than younger adults, raising dosing concerns
- 258 registered supplement products exist despite very limited human efficacy data — marketing is far ahead of the science
- Some papers used TUDCA as a research tool to block ER stress in lab models, not as a tested supplement — this is often misrepresented in marketing
Products Containing TUDCA (Tauroursodeoxycholic Acid)
See how TUDCA (Tauroursodeoxycholic Acid) is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-10