Quercetin vs TUDCA (Tauroursodeoxycholic Acid)

Mechanism

Quercetin is a flavonoid that inhibits mast cell degranulation and histamine release, functions as a potent senolytic (selectively clearing senescent cells) when combined with dasatinib or fisetin, and activates AMPK and SIRT1 pathways. It inhibits PI3K/Akt/mTOR signaling, suppresses NF-kB, and modulates JAK-STAT inflammatory cascades. As a zinc ionophore, it facilitates zinc entry into cells, which may inhibit viral RNA-dependent RNA polymerase.

Standard Dosing

500-1000mg daily

Timing

With meals for absorption. For senolytic effect: 3-day pulse monthly on empty stomach.

Cycle Duration

ongoing for general use; pulsed monthly for senolytic protocols

Side Effects

• Headache
• Mild GI upset
• Tingling extremities at high doses
• Rare: kidney toxicity at very high doses

Contraindications

• Pregnancy/lactation at high doses
• Concurrent cyclosporine therapy

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Mechanism

TUDCA is a water-soluble bile acid conjugate (taurine + ursodeoxycholic acid) with potent hepatoprotective and cytoprotective properties. It inhibits the mitochondrial pathway of apoptosis by preventing BAX translocation to mitochondria and cytochrome c release. TUDCA reduces endoplasmic reticulum (ER) stress by acting as a chemical chaperone, assisting protein folding and reducing the unfolded protein response (UPR). It protects hepatocytes by stabilizing cell membranes, displacing toxic hydrophobic bile acids (chenodeoxycholic, lithocholic) from biliary epithelium, and promoting choleresis (bile flow). Additionally, it has neuroprotective effects via reduction of ER stress in neurons and modulation of the TGR5 bile acid receptor.

Standard Dosing

250-500mg daily

Timing

With meals for liver support. Some protocols recommend before meals to prime bile flow.

Cycle Duration

Cycle 4-8 weeks for liver support; ongoing at low dose for chronic liver conditions under supervision

Side Effects

• Diarrhea (dose-dependent)
• GI discomfort
• Flatulence
• Rare: calcification of gallstones

Contraindications

• Complete biliary obstruction (cannot reach bile ducts if obstruction is complete)
• Calcified gallstones (UDCA/TUDCA dissolve cholesterol stones, not calcified)
• Acute cholangitis
• Complete biliary obstruction
• Gallstones (may mobilize stones)

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