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What Is TUDCA? UK Guide
What is TUDCA?
A clear, factual guide to TUDCA (tauroursodeoxycholic acid) — what this bile acid is, how it relates to UDCA, the forms and dose ranges you will see on UK labels, and how to check purity and testing. TUDCA is sold as a food supplement.
Last updated July 2026 · Written by Vitality Supplements Editorial Team · ~2,300 words · 9 min read
Food supplement information — not medical advice
UK manufactured
ISO/IEC 17025 batch tested
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Evidence-referenced
Quick answer
What is TUDCA?
TUDCA stands for tauroursodeoxycholic acid — a bile acid. Chemically it is the taurine-conjugated form of ursodeoxycholic acid (UDCA), meaning a molecule of UDCA joined to the amino acid taurine. It occurs naturally in the body in very small amounts and has a long history in traditional East Asian medicine, where it was originally obtained from bear bile; today supplement-grade TUDCA is produced synthetically. In the UK it is sold as a food supplement with no authorised health claims. Because grades and purity vary, a stated purity percentage and third-party testing are the details that matter most when comparing products.
Key takeaways
- TUDCA = tauroursodeoxycholic acid, a bile acid.
- It is the taurine-conjugated form of ursodeoxycholic acid (UDCA).
- Found naturally in the body in small amounts; supplement-grade is made synthetically.
- Sold as capsules, typically standardised to a high purity (often ≥98%).
- Market servings commonly range from about 250mg to 1100mg per day.
- It is a UK food supplement with no authorised health claims — check purity and a Certificate of Analysis.
The basics
What TUDCA actually is
TUDCA — tauroursodeoxycholic acid — is a bile acid. Bile acids are molecules the body makes from cholesterol and stores in the gallbladder; they are best known for their role in the digestion of dietary fats. TUDCA is specifically the taurine conjugate of ursodeoxycholic acid (UDCA): a molecule of UDCA bonded to the amino acid taurine. That conjugation makes it more water-soluble than UDCA on its own.
TUDCA occurs naturally in the human body as a minor bile acid, and it has a long history in traditional East Asian medicine, where the original source was bear bile. Modern supplement-grade TUDCA is not derived from animals — it is manufactured synthetically to a defined purity. As a supplement it is usually a white crystalline powder presented in capsules. It is sold as a food supplement in the UK and, like other supplements, carries no authorised health claims, so this guide stays factual: what it is, the forms and doses on the market, and how to judge quality.
A bile acid — the taurine-conjugated form of UDCA — sold today as a high-purity synthetic supplement.
On the label
Forms & dose ranges on the market
TUDCA is sold almost exclusively as capsules of TUDCA powder, usually standardised to a high purity. The two numbers to read on a label are the amount of TUDCA per capsule and the stated purity — a "1100mg" capsule of 98%+ TUDCA is a very different thing from a blend where TUDCA is only part of the contents. The table below summarises the serving sizes you will typically see; these describe the market, not a recommended dose.
| What you will see | Typical on the market | What it means |
|---|---|---|
| Form | Capsules of TUDCA powder | The standard format; occasionally combined with other liver-support ingredients in blends. |
| Purity | Often standardised to ≥98% | Higher, verified purity is the key quality marker. Look for a stated percentage. |
| Lower serving | ~250–500mg per day | Common in entry or blended products. |
| Higher serving | ~1000–1100mg per day | Common in single-ingredient, higher-strength products. |
| Source | Synthetic, animal-free | Modern supplement TUDCA is made synthetically, not from bear bile. |
| Verification | HPLC + Certificate of Analysis | The lab methods that confirm identity and purity of each batch. |
There is no official Recommended Daily Amount (RDA) for TUDCA. Where you sit in the range above is a personal decision — many people prefer to speak to a healthcare professional first, particularly because TUDCA is a bile acid. People often research it alongside other longevity supplements and NAD-support ingredients; see our what is NAD guide for that wider context.
Two numbers decide quality: how much TUDCA per capsule, and how pure it is verified to be.
Buying criteria
What to check before you buy
Because TUDCA is a relatively expensive raw material, purity and honest labelling are where products differ most. The goal is simple: know exactly how much TUDCA you are getting per capsule, and have proof it is what the label says.
- A stated purity — e.g. "standardised to 98%+ TUDCA", not just a total capsule weight.
- Clear TUDCA amount per capsule — so you can compare like with like across brands.
- HPLC verification — the analytical method that confirms TUDCA identity and purity.
- A Certificate of Analysis on request — batch-level proof of purity and contaminant testing.
- Independent, accredited testing — ideally from an ISO/IEC 17025-accredited laboratory.
- UK manufacturing & clear labelling — easier to verify and hold to standard.
Whatever you choose, the same principle applies as with any supplement: buy on verified content and purity, not on the biggest number on the front of the pack. For more on our testing approach, see how we test for quality and sourcing.
Common questions
TUDCA FAQ
TUDCA stands for tauroursodeoxycholic acid. It is a bile acid — specifically the taurine-conjugated form of ursodeoxycholic acid (UDCA). It is sold as a food supplement in the UK with no authorised health claims.
They are related but not identical. TUDCA is UDCA joined to the amino acid taurine (a conjugate), which makes it more water-soluble. UDCA (ursodeoxycholic acid) is the underlying bile acid. On supplement labels you will usually see TUDCA specifically.
Historically TUDCA was associated with bear bile in traditional East Asian medicine. Modern supplement-grade TUDCA is made synthetically to a defined purity and is animal-free. A good product will state its purity and provide a Certificate of Analysis.
Servings on the market commonly range from about 250mg to 1100mg per day, with single-ingredient products often at the higher end. This describes what products offer rather than an established or recommended dose — there is no official RDA for TUDCA. Consult a healthcare professional before starting any new supplement.
Look for a stated purity (often 98%+), a clear TUDCA amount per capsule, HPLC testing, and a Certificate of Analysis from an ISO/IEC 17025-accredited laboratory. Buy on verified purity rather than on price or capsule count alone.
As a general precaution TUDCA is not recommended for anyone under 18, or during pregnancy or breastfeeding. Because it is a bile acid, anyone taking medication or managing a health condition — particularly involving the liver, gallbladder or digestion — should speak to a healthcare professional first. Introduce one product at a time.
TUDCA, done properly
Our Premium TUDCA is 1100mg per serving across 60 capsules, UK-manufactured and independently batch tested, with a Certificate of Analysis available on request.
Continue reading
About the author. This guide was written and reviewed by the Vitality Supplements Editorial Team, a UK supplement manufacturer. Every batch we produce is independently tested by an ISO/IEC 17025-accredited laboratory, with a Certificate of Analysis available on request.
This article is for general information about food supplements and is not medical advice. TUDCA is sold as a food supplement in the UK and carries no authorised health claims. Always consult a qualified healthcare professional before starting any supplement, particularly if you are under 18, pregnant, breastfeeding, taking medication or managing a health condition. References available on our research references page.
