Best TUDCA Supplements in 2026: Liver Support and Beyond

TUDCA — tauroursodeoxycholic acid — is a bile salt that your liver produces in tiny amounts and that has become one of the more interesting compounds in advanced longevity protocols. Originally studied as a treatment for cholestatic liver disease, TUDCA has since shown up in research on ER stress, mitochondrial protection, neurodegeneration, and even retinal health. It is not a household-name supplement, but among clinicians who work with biohackers and serious longevity enthusiasts, it has earned a quiet following.

This guide explains what TUDCA actually does in the body, what the 2026 evidence supports (and what it does not), how to dose it, and how it fits into a broader liver-support and cellular-health stack. We also cover the NAC synergy — pairing TUDCA with N-acetyl cysteine is one of the most under-discussed combos in longevity supplementation, and our NAC guide covers the other half of that pairing.

What TUDCA actually is (and why a bile salt matters)

TUDCA is a conjugated bile acid — a taurine-bound version of ursodeoxycholic acid (UDCA), which is itself a bile acid used clinically for decades to treat primary biliary cholangitis and gallstones. Your liver makes bile salts from cholesterol, secretes them into the bile ducts, and uses them to emulsify dietary fat. About 95% of bile salts are normally recycled through the enterohepatic circulation; only a small amount is lost in stool.

What makes TUDCA therapeutically interesting is that bile acids are not just digestive surfactants — they are signaling molecules. They activate the bile acid receptors FXR and TGR5, which regulate lipid metabolism, glucose homeostasis, and mitochondrial function. TUDCA in particular has a unique property: it acts as a chemical chaperone that stabilizes protein folding in the endoplasmic reticulum (ER), reducing ER stress. That single mechanism explains most of its downstream effects.

Unlike many longevity supplements, TUDCA has a real clinical track record. UDCA (the closely related compound) has been an FDA-approved drug for cholestatic liver disease since 1997. TUDCA itself is sold as a supplement in the US but has been used for decades in traditional Chinese medicine under the name "bear bile" — historically harvested from bears, now produced synthetically and sold to Western supplement buyers without the ethical baggage.

Liver support: the strongest evidence

The clearest evidence for TUDCA is in liver support, particularly for cholestatic conditions (where bile flow is impaired). In cholestasis, hydrophobic bile acids accumulate inside liver cells and cause damage. TUDCA is a hydrophilic bile acid that displaces the toxic hydrophobic ones, restoring bile flow and protecting hepatocytes. This is well-established clinical pharmacology.

For healthy adults without liver disease, the case for TUDCA is more speculative. The relevant question is whether subclinical bile-acid toxicity or ER stress is contributing to long-term liver burden — particularly in people on multiple medications, those with metabolic dysfunction, or those who drink alcohol. The 2026 view among functional medicine practitioners is that TUDCA is reasonable as a periodic "liver-support" supplement, especially during periods of higher-than-usual pharmaceutical or alcohol load.

TUDCA has also been studied for insulin sensitivity. A 2021 meta-analysis of randomized trials found that bile acid supplementation modestly improved fasting glucose and insulin resistance markers, though effect sizes were small and largely driven by studies in patients with existing metabolic dysfunction. For general longevity use, TUDCA's glucose effects are best viewed as a secondary benefit rather than the primary reason to take it.

Cellular protection: ER stress and the unfolded protein response

Here is where TUDCA gets interesting for longevity researchers. The endoplasmic reticulum is the organelle where proteins are folded before being shipped elsewhere in the cell. When protein-folding demand exceeds capacity — from oxidative stress, viral infection, high glucose, or just aging — misfolded proteins accumulate. The cell responds with the unfolded protein response (UPR), which either restores ER function or triggers apoptosis if the stress is too severe.

Chronic ER stress is one of the hallmarks of aging cell biology. It shows up in neurodegenerative disease (Alzheimer's, Parkinson's), metabolic disease (diabetes, fatty liver), and cardiovascular disease. TUDCA, by acting as a chemical chaperone that helps proteins fold correctly, dampens the UPR and reduces chronic ER stress. Animal studies have shown TUDCA reduces amyloid plaque burden in Alzheimer's models, protects dopaminergic neurons in Parkinson's models, and improves outcomes in stroke and traumatic brain injury models.

Human evidence is much thinner. A small 2023 trial in adults with mild cognitive impairment suggested TUDCA was safe and well-tolerated for 6 months, with a trend toward improved cerebrospinal fluid biomarkers. Larger trials are underway in 2026. For now, the neuroprotective case is mechanistically plausible but not yet clinically proven.

Mitochondrial protection and the UPRmt

One of the most exciting areas of TUDCA research — and the reason it gets discussed alongside NMN and NAD+ boosters in longevity circles — is its effect on mitochondria. TUDCA appears to protect mitochondrial function in two ways: by reducing ER stress that would otherwise impair mitochondrial calcium signaling, and by directly stabilizing mitochondrial membranes under stress.

A 2022 paper in Cell Metabolism showed that TUDCA treatment extended lifespan in C. elegans by activating the mitochondrial unfolded protein response (UPRmt) — a stress-response pathway that improves mitochondrial protein quality control. The same pathway is activated by exercise, caloric restriction, and certain NAD+ precursors, which is why TUDCA is sometimes described as a "mitohormetic" compound: a low-level stressor that triggers a protective response.

Whether the worm data translates to humans is an open question, but it positions TUDCA as a candidate for inclusion in a broader mitochondrial support stack. See our mitochondrial health guide for the full picture of how to support mitochondria with exercise, NAD+ precursors, CoQ10, and (possibly) TUDCA.

How much to take (250–500mg/day)

Clinical doses of TUDCA in liver-support studies range from 250mg to 1500mg per day, typically split into 2–3 doses. For general longevity use, the most common protocol is 250–500mg per day, taken with food. Higher doses (750–1500mg/day) are used clinically for cholestatic liver conditions but should be supervised by a physician.

Most TUDCA supplements come in 250mg or 500mg capsules. A reasonable starting protocol is one 250mg capsule with breakfast and one with dinner (500mg total daily) for 8–12 weeks, followed by a maintenance dose of 250mg/day or a cycling protocol (5 days on, 2 days off). Some practitioners recommend cycling TUDCA in 3-month blocks with 1-month breaks, on the theory that continuous bile-acid supplementation might downregulate endogenous bile acid production.

There is no good human evidence on cycling, but it is a reasonable precaution given how little we know about long-term TUDCA use in healthy adults. If you are taking TUDCA primarily for liver support during a specific period (a course of medication, a vacation with alcohol, etc.), short-term use of 500–1000mg/day for 2–4 weeks is a common protocol.

Our top pick: Double Wood TUDCA 500mg

Double Wood's TUDCA delivers 500mg per capsule of pure TUDCA — the upper end of the typical daily dose in a single serving. Double Wood is one of the more reputable US supplement brands for niche compounds (they make our recommended citicoline and TUDCA, and their NMN has been a long-time favorite). The product is third-party tested for purity, and the 500mg dose means you can take one capsule for a maintenance dose or split it for a more conservative protocol.

The Double Wood product is sold in 60-capsule bottles, which is 2–4 months of supply depending on dosing. At roughly $25–35 per bottle, the cost per dose is competitive. The brand publishes a certificate of analysis on request — a practice we like to see in the niche-compound space, where quality control varies widely.

One caveat: TUDCA is one of those supplements where cheaper products can be genuinely problematic. TUDCA is synthesized from cholic acid, and poorly manufactured product can contain residual bile-acid impurities that are themselves hepatotoxic. Stick with brands that publish third-party testing — Double Wood, ProHealth, and Do Not Age are the three we trust.

The NAC synergy

One of the best under-discussed stack combinations in longevity supplementation is TUDCA + N-acetyl cysteine (NAC). The two compounds support liver function through complementary mechanisms:

• TUDCA supports bile flow and protects hepatocytes from bile-acid toxicity. It also acts as a chemical chaperone in the ER, reducing protein-folding stress.
• NAC is the precursor to glutathione — the liver's master antioxidant. NAC replenishes glutathione stores, supports phase II detoxification (conjugation pathways), and protects against acetaminophen and other xenobiotic toxicity.

Together, TUDCA + NAC address both the "plumbing" (bile flow) and the "chemistry" (glutathione-mediated detoxification) of liver support. The combination is particularly popular during periodic liver-support protocols — for example, 4 weeks of 500mg TUDCA + 600mg NAC daily after a course of antibiotics or a period of heavier-than-usual alcohol intake.

Our NAC guide covers the NAC side in detail, including dosing (600–1800mg/day), the glycine synergy, and the FDA's brief 2020 warning-letter episode (now resolved) that briefly disrupted NAC availability.

Cautions and contraindications

TUDCA is generally well-tolerated at recommended doses. The most common side effects are mild GI symptoms — bloating, loose stools, or mild cramping — typically at doses above 1000mg/day. Less common but more serious: TUDCA can theoretically interfere with the absorption of fat-soluble vitamins (A, D, E, K) and certain medications, because bile acids alter micelle formation in the gut. Take TUDCA at least 2 hours apart from fat-soluble vitamin supplements or fat-soluble medications (including certain antiretrovirals and immunosuppressants).

People with bile-duct obstruction, gallbladder disease, or current pancreatitis should not take TUDCA without physician supervision. If you have a history of gallstones, talk to your doctor — increasing bile flow can sometimes mobilize stones in problematic ways. TUDCA has not been studied in pregnancy or lactation; avoid in those populations.

Finally, TUDCA can lower blood sugar modestly. If you take insulin or oral hypoglycemics, monitor glucose more closely when starting TUDCA and discuss with your endocrinologist. This is mostly a concern at higher doses, but worth flagging.

How to take TUDCA

1. Dose: 250–500mg per day for general use. 500–1000mg/day for periodic liver-support protocols (4–8 weeks).
2. Take with food: TUDCA is a bile acid and works in concert with digestive processes. Taking it on an empty stomach can cause GI upset.
3. Split the dose: If taking 500mg or more per day, split into two doses (breakfast and dinner) for steadier blood levels.
4. Consider cycling: 5 days on / 2 days off, or 3 months on / 1 month off. Long-term continuous use has not been studied in healthy adults.
5. Stack with NAC: For liver-support protocols, combine with 600–1200mg NAC per day. See our NAC guide for NAC dosing.
6. Separate from fat-soluble vitamins: Take TUDCA at least 2 hours apart from vitamin D3/K2, vitamin A, vitamin E, or fat-soluble medications.

The bottom line

TUDCA is one of the more interesting compounds in the 2026 longevity supplement landscape, with a real clinical track record in liver disease and a growing body of mechanistic research on ER stress, mitochondrial protection, and cellular stress resilience. For healthy adults, the case is more speculative than for NMN or creatine, but the safety profile is excellent and the mechanistic logic is sound.

Our recommendation: Double Wood TUDCA 500mg, dosed at 250–500mg per day with food, optionally cycled. If you have specific liver concerns or are going through a period of heavier pharmaceutical or alcohol load, a 4–8 week protocol of 500–1000mg/day alongside NAC is a reasonable approach.

TUDCA fits into a broader cellular-health stack alongside NMN (for NAD+ and mitochondrial biogenesis), NAC (for glutathione and liver detoxification), and the foundational inputs covered in our supplement stack guide and mitochondrial health guide. It is also available through the supplements hub alongside our other reviewed products. TUDCA is not a top-tier longevity supplement, but for the right user — particularly those over 40 with metabolic concerns or elevated liver enzymes — it is one of the more under-appreciated options on the list.