The verification-first TUDCA at a fair price
Double Wood wins this category not because TUDCA is a proven liver miracle — it isn't, at least not as an over-the-counter supplement — but because if you're going to take TUDCA anyway, this is the version whose identity and potency are actually checked against a USP standard by HPLC. Each capsule is 250mg, and the labeled 2-capsule serving delivers 500mg, the top of the 250-500mg range used in the pharma and pilot literature. The bitterness people complain about is, ironically, a feature: genuine bile acid tastes foul, which is a rough tell against adulteration. What you're buying is verification and dose flexibility, not a clinical outcome.
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Third-party HPLC potency plus heavy-metals and microbial screening, with identity and potency verified against a USP reference standard — the single most important thing you can check on a bile-acid supplement, and most brands don't publish it. Not the absolute most exhaustive program in the field (BodyBio edges it), but the identity verification against USP is exactly the right test for TUDCA.
Synthesized (not bear-bile) TUDCA in a single-ingredient capsule; 250mg caps scale cleanly to a 500mg/day research-range serving.
250mg/cap scales to a 500mg/day serving — the upper end of the 250-500mg range seen in cholestasis pilot work. You can also run 250mg/day for a gentler, cheaper trial.
TUDCA is generally well tolerated at these doses; the main complaint is bitter aftertaste and occasional loose stools as bile flow shifts. No serious OTC safety signals at 250-500mg.
~$0.50/cap, ~$1.00 per 500mg serving. Not the cheapest, but the cheapest that also gives you HPLC verification — the value case is testing-per-dollar, not raw price.
“Active TUDCA content is HPLC-verified against USP standards for potency and identity.”
Listed certifications confirm third-party HPLC testing versus a USP reference standard, which is the appropriate identity/potency method for a bile acid.
“500mg/day supports liver and bile-flow health.”
500mg sits at the top of the 250-500mg range used in cholestasis literature, and UDCA/TUDCA are established in pharma cholestasis care (PMID 16741551), but rigorous human outcome trials for OTC TUDCA supplementation in healthy livers are lacking.
“The strong bitter taste indicates a genuine, unadulterated bile acid.”
Bile acids are intensely bitter, so bitterness is consistent with real TUDCA, but taste is a heuristic — the HPLC assay, not the flavor, is the actual proof of identity.
TUDCA's OTC market is full of unverified powder. Double Wood publishing HPLC identity/potency against USP is the differentiator — you're paying for the certainty that the capsule contains what the label says, at the dose it says.
Two caps = 500mg, the upper bound of the 250-500mg range in the cholestasis pilot literature (e.g., PMID 9146781). One cap gives a 250mg entry dose. That flexibility from a single SKU is unusual and useful.
Double Wood earns #1 by doing the one thing that matters for a bile-acid supplement: proving, by HPLC against a USP standard, that the powder is real and correctly dosed. Pair that with a clean scale to 500mg/day and a fair price, and it's the pick for anyone who's decided to run TUDCA. Keep expectations calibrated — the evidence supports the mechanism and pharma use, not a guaranteed OTC benefit.
Establishes the anticholestatic, cytoprotective and anti-apoptotic mechanisms of UDCA/TUDCA that underpin their pharma use in cholestatic liver disease.
Pilot crossover showing TUDCA and UDCA both improve liver biochemistry in PBC, supporting the 500mg-range dosing used here.
