MILK THISTLE
Updated: Oct 25
Milk thistle is one of the herbs mentioned most often in our groups for liver support. Several Lyme-literate doctors and herbalists include it to help support the liver, including during treatment.
Short on time or energy? A quick-view graphic with the key points is at the bottom of this post.
WHAT IT IS
Milk thistle is a plant whose seeds contain silymarin, a group of natural compounds. The most active one is silybin, often called silibinin.
HOW LYME DOCTORS AND HERBALISTS USE IT
- Stephen Buhner includes milk thistle in his core Bartonella protocol to help protect the liver. It is also part of his Babesia protocol.
- Dr. Jill Carnahan includes milk thistle among the nutrients that support Bartonella treatment, to help protect the liver. She also points to its antioxidant, anti-inflammatory and nerve-protecting effects.
- Dr. Richard Horowitz lists milk thistle as one of the complementary options when liver tests are elevated and other causes have been ruled out, along with NAC, alpha lipoic acid and glutathione.
- Dr. Bill Rawls names milk thistle as one of his two favorite detox and liver-support supplements. His team explains that it supports healthy bile flow, helps protect liver cells and may raise glutathione levels.
- For mold illness, Dr. Neil Nathan includes milk thistle among his liver detox supports. Dr. Jill Crista explains that it may help keep mold toxins out of liver cells and support liver repair.
WHAT RESEARCH IN PEOPLE SHOWS
- The NIH's National Center for Complementary and Integrative Health (NCCIH) says there isn't enough high-quality research yet to reach firm conclusions about milk thistle for liver conditions. Results so far have been mixed or too limited.
- A 2024 review of 26 studies in about 2,400 people with fatty liver found silymarin lowered liver enzymes and reduced liver fat. The researchers said more studies are needed to confirm this.
- A large 2025 review of 55 studies found silymarin lowered two liver enzymes (ALT and AST) overall. But the studies varied a lot, and when the researchers allowed for studies that may never have been published, the drop was no longer clear. They said the results should be read with caution.
- Protecting the liver during antibiotics: in one small 2023 trial of people taking tuberculosis antibiotics, those who also took silymarin had lower liver enzyme levels, and none of them developed liver injury (2 people in the other group did). But two larger reviews (2023 and 2025) found no clear benefit for liver injury from tuberculosis antibiotics. These studies were in tuberculosis treatment, not Lyme.
LAB AND ANIMAL RESEARCH (studies in people are still needed)
- Mast cells and histamine: in a 2023 study, silibinin calmed mast cells in the lab and reduced allergy-like reactions in mice. An older lab study on human mast cells grown in a dish found it lowered histamine release (older source, still worth reading).
- Liver inflammation: in a 2023 rat study, silymarin lowered inflammation signals and partly restored glutathione after liver injury from a toxin.
- Detox: the National Cancer Institute notes that lab and animal research shows silymarin can boost the body's detox enzymes, including one that works with glutathione. A 2022 study in mice found it lowered the liver's production of a harmful acetaminophen (Tylenol) byproduct and helped restore glutathione.
SAFETY
- Milk thistle is generally well tolerated. The most common side effects are stomach upsets such as bloating, nausea and gas (NCCIH).
- The NIH LiverTox database rates milk thistle as unlikely to cause liver injury.
- Skip it if you're allergic to plants in the daisy or ragweed family, such as chrysanthemum or marigold (NCCIH, Memorial Sloan Kettering).
- Its safety during pregnancy and breastfeeding hasn't been well studied.
- Small studies suggest it may help lower blood sugar in type 2 diabetes, so talk with your doctor first if you take diabetes medicine.
- Memorial Sloan Kettering notes it has some estrogen-like activity, so talk with your doctor first if you have a hormone-sensitive condition.
- It can interact with some medicines. Memorial Sloan Kettering lists warfarin and some transplant and psychiatric medicines among them. Always check with your doctor if you take any medicine.
- NCCIH notes that some milk thistle products have contained a different amount than the label says, or contaminants, so the brand you choose matters.
MY EXPERIENCE
I've used milk thistle in combination formulas, but never on its own.
WHERE TO BUY
Buy products on Fullscript for a 25% discount:
Buy here (Designs for Health Milk Thistle: milk thistle seed extract):
Buy here (Integrative Therapeutics Super Milk Thistle X: milk thistle, artichoke, dandelion and licorice):
Super Milk Thistle X contains licorice. Its label says not to use it if you're pregnant or nursing, have high blood pressure or heart disease, have a bile duct blockage, or are allergic to ragweed-family plants. It also says to check with your doctor first if you have gallstones or take prescription medicine.
Buy here (Pure Encapsulations Silymarin: milk thistle seed extract):
RELATED POSTS
LIVER SUPPORT - POSSIBLE SOLUTIONS
SOURCES
Milk Thistle: Usefulness and Safety. National Center for Complementary and Integrative Health (NCCIH), NIH. Updated February 2025.
Administration of silymarin in NAFLD/NASH: A systematic review and meta-analysis. Annals of Hepatology, 2024.
Are alterations needed in Silybum marianum (Silymarin) administration practices? A novel outlook and meta-analysis on randomized trials targeting liver injury. BMC Complementary Medicine and Therapies, April 2025.
Systematic review and network meta-analysis of efficacy and safety of interventions for preventing anti-tuberculosis drug induced liver injury. Scientific Reports, November 2023.
The Effectiveness of Silymarin in the Prevention of Anti-Tuberculosis Drug-Induced Hepatotoxicity: A Randomized Controlled Clinical Trial. International Journal of Preventive Medicine, April 2023.
Silibinin attenuated pseudo-allergic reactions and mast cell degranulation via PLCγ and PI3K/Akt signaling pathway. Phytotherapy Research, 2023.
Effect of silymarin on the relative gene expressions of some inflammatory cytokines in the liver of CCl4-intoxicated male rats. Scientific Reports, September 2023.
Silymarin Protects against Acute Liver Injury Induced by Acetaminophen by Downregulating the Expression and Activity of the CYP2E1 Enzyme. Molecules, December 2022.
Milk Thistle (PDQ)–Health Professional Version. National Cancer Institute. Last revised February 17, 2022.
Milk Thistle. Memorial Sloan Kettering Cancer Center, About Herbs. Last updated July 22, 2026.
Dr. Jill Carnahan. Nutrients That Support Bartonella Treatment: What the Science Says (And What I Do in My Practice). April 7, 2026.
Dr. Bill Rawls. Detoxing for Lyme: An Easy 5-Week Guide To Long-Term Health. September 28, 2022.
Dr. Richard Horowitz. 16-Point MSIDS Map. January 2022.
Older sources, still worth reading:
Stephen Buhner. Healing Lyme Disease Coinfections (2013) and Natural Treatments for Lyme Coinfections (2015).
Better Health Guy. A Comprehensive & Practical Review of Mold Toxicity and its Complications (Dr. Neil Nathan and Dr. Jill Crista). April 2021.
Milk Thistle. NIH LiverTox. Last updated January 21, 2020.
Silibinin inhibits the production of pro-inflammatory cytokines through inhibition of NF-κB signaling pathway in HMC-1 human mast cells. Inflammation Research, 2013.
Disclaimer: Rise Above Lyme makes no claims about any possible benefit of using any product mentioned within this site. Always consult with your doctor before adding anything. The information shared is based on personal experience, years of accumulated researched resources from Lyme Literate doctors and polls conducted within Lyme groups from actual patient experience using these solution ideas.
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