Supplement·Interactions·Reviewed June 9, 2026
Milk Thistle interactions.
Milk Thistle has 21 documented interactions in the NutriStack database: 13 that need timing or caution and 8 that work synergistically. The full list, with what each pairing does, is below.
Milk Thistle at a glance.
A quick, data-grounded summary. The full table is below.
Milk Thistle has 21 documented interactions in the NutriStack database: 13 that need timing or caution and 8 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with milk thistle.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Alcohol | Caution | Milk thistle (silymarin) is often taken for liver support during alcohol use, but evidence does not show it prevents alcohol-related liver damage,... |
| DIM | Caution | DIM shifts estrogen metabolism toward 2-hydroxylation by inducing CYP1A enzymes, while milk thistle silymarin can mildly inhibit some CYP and... |
| Fenofibrate | Caution | Fenofibrate can elevate liver transaminases and, rarely, cause hepatotoxicity. Milk thistle (silymarin) is taken for liver support but can mask or... |
| Fluconazole | Caution | Silymarin from milk thistle inhibits CYP3A4, CYP2C9, UGT enzymes, and P-glycoprotein in vitro, and clinical pharmacokinetic studies have shown... |
| Glimepiride | Caution | Glimepiride is metabolized primarily by CYP2C9. Silymarin (milk thistle) inhibits CYP2C9 in vitro and has independent hypoglycemic activity. The... details → |
| Glipizide | Caution | Glipizide is metabolized primarily by CYP2C9. Silymarin (milk thistle) inhibits CYP2C9 in vitro and has independent hypoglycemic activity... details → |
| Glyburide | Caution | A 6-month RCT in 59 patients found that adding silymarin 200 mg three times daily to glyburide improved HbA1c and postprandial glucose more than... details → |
| Gotu Kola | Caution | Both Centella asiatica and milk thistle (silymarin) are botanicals with case-report associations to liver effects. Gotu kola has documented case... |
| Itraconazole | Caution | Milk thistle (silymarin) has shown weak and inconsistent effects on CYP3A4 and P-glycoprotein in laboratory studies. While clinically significant... |
| Niacin (Prescription) | Caution | High-dose prescription niacin, especially sustained- or extended-release formulations, can cause dose-dependent hepatotoxicity ranging from... |
| Pterostilbene | Caution | Both pterostilbene and silymarin from milk thistle are metabolized by hepatic conjugation enzymes (glucuronidation and sulfation), and silymarin can... |
| Rifampin | Caution | Rifampin is hepatotoxic and silymarin from milk thistle is often taken for liver support; combining them can obscure or complicate interpretation of... |
| Voriconazole | Caution | Milk thistle (silymarin) has been reported to modulate CYP3A4 and CYP2C9 activity in some experimental settings, and these enzymes contribute to... |
| Berberine | Synergy | Milk thistle (silymarin) inhibits CYP enzymes that metabolize berberine, potentially increasing its bioavailability and duration of action. |
| Berberine HCl | Synergy | Milk thistle (silymarin) inhibits CYP enzymes that metabolize berberine hcl, potentially increasing its bioavailability and duration of action. |
| Curcumin Phytosome | Synergy | Both are hepatoprotective compounds that support liver health through complementary antioxidant and anti-inflammatory mechanisms. |
| Isoniazid | Synergy | Isoniazid carries a recognized risk of hepatotoxicity. Silymarin from milk thistle has been studied as a hepatoprotective adjunct in patients on... |
| NAC | Synergy | Both support liver health through glutathione-related mechanisms. NAC provides glutathione precursor; silymarin protects liver cells and supports... details → |
| Schisandra | Synergy | Schisandra lignans and milk thistle silymarin both support hepatocyte protection and antioxidant defense, giving complementary hepatoprotective... |
| Sulforaphane | Synergy | Sulforaphane and silymarin (the active fraction of milk thistle) both activate Nrf2-driven cytoprotective and antioxidant defenses in the liver,... |
| Turmeric/Curcumin | Synergy | Both are hepatoprotective compounds that support liver health through complementary antioxidant and anti-inflammatory mechanisms. |
The full milk thistle profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common milk thistle questions.
Quick answers drawn from the table above.
What interacts with Milk Thistle?
In the NutriStack database, Milk Thistle has 21 documented interactions with other supplements and medications. The most notable include Alcohol, DIM, Fenofibrate, Fluconazole, and Glimepiride.
What works well with Milk Thistle?
Milk Thistle pairs synergistically with Berberine, Berberine HCl, Curcumin Phytosome, Isoniazid, and NAC in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take Milk Thistle with Alcohol?
NutriStack classifies the Milk Thistle and Alcohol pairing as caution: Milk thistle (silymarin) is often taken for liver support during alcohol use, but evidence does not show it prevents alcohol-related liver damage, and its perceived... Do not treat milk thistle as protection that makes drinking safe. The most effective step for alcohol liver injury is reducing or stopping alcohol;...
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