In a 2016 lab study, a water-based dandelion root extract triggered death in more than 95% of colon cancer cells within 48 hours. No published trial has tested it in a person with cancer.
Both of those facts are true. This page explains what the studies tested, why a dish is not a patient, and what to ask if you are considering dandelion during cancer treatment.
Quick Answer: Can Dandelion Root Treat Cancer?
There is no evidence that it treats cancer in people. A lab-made root extract killed leukemia, melanoma, pancreatic and colon cancer cells in dishes, and slowed human colon tumours in mice by over 90%. 0 published trials have tested it in cancer patients, and in 2008 it did not slow breast or prostate cancer cells.
Key Takeaways
- In 2016, root extract triggered death in over 95% of colon cancer cells.
- The same extract slowed human colon tumours in mice by over 90%.
- In 2008, root extract did not slow breast or prostate cancer cell growth.
- 0 published clinical trials have tested dandelion root in cancer patients.
- MSKCC notes dandelion inhibited 2 drug-processing enzymes in lab and animal studies.
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What the Lab Studies Tested
Most of the cancer interest in dandelion root traces to 1 research group that tested a water-based root extract on human cancer cells grown in dishes, from about 2011. Their papers reported that the extract triggered programmed cell death in cancer cells while sparing normal cells.
How this fits with the rest of the plant's research is in what dandelion root is used for.
| Year | Cells or model | Reported result |
|---|---|---|
| 2011[1]Selective induction of apoptosis through activation of caspase-8 in human leukemia cells (Jurkat) by dandelion root extract — Journal of Ethnopharmacology (2011) View source | Leukemia cells | Cell death, with normal blood cells not significantly affected |
| 2011[2]The efficacy of dandelion root extract in inducing apoptosis in drug-resistant human melanoma cells — Evidence-Based Complementary and Alternative Medicine (2011) View source | Drug-resistant melanoma cells | Cell death, no toxicity to non-cancer cells |
| 2012[3]Efficient induction of extrinsic cell death by dandelion root extract in human chronic myelomonocytic leukemia (CMML) cells — PLoS One (2012) View source | Chronic myelomonocytic leukemia cells | Cell death and autophagy |
| 2012[4]Selective induction of apoptosis and autophagy through treatment with dandelion root extract in human pancreatic cancer cells — Pancreas (2012) View source | Pancreatic cancer cells | Cell death; normal fibroblasts resistant |
| 2016[5]Dandelion root extract affects colorectal cancer proliferation and survival through the activation of multiple death signalling pathways — Oncotarget (2016) View source | Colon cancer cells, and tumours in mice | Over 95% of cells died in 48 hours; tumours grew over 90% less |
Why a Dish Is Not a Patient
Cell studies are where cancer drug discovery starts, and many candidates that look promising in a dish never work in people. An extract poured directly onto cancer cells reaches them at concentrations that swallowing a capsule may never produce, and a mouse is not a person.
- Concentration: cells were bathed in extract; no study measured how much reaches human blood.
- Mice: the colon tumours were human cancer cells grown in mice, given extract by mouth.
- Product: the extract was prepared in the lab, not bought as a supplement.
- People: no published trial, so effect, dose and safety in patients are unknown.
Not Every Lab Result Agrees
The exceptions rarely reach headlines. In a 2008 study, separate extracts of dandelion leaf, flower and root were tested on breast and prostate cancer cells, and the results depended on which part of the plant was used.
- Growth, leaf extract: slowed 1 breast cancer cell line.
- Growth, root and flower extracts: no effect on either cell type.
- Invasion: the root extract blocked invasion by the breast cells; the leaf blocked the prostate cells.
- Hormone-sensitive breast cancer: MSKCC notes preclinical signs that dandelion may increase cell growth.[7]Dandelion, About Herbs — Memorial Sloan Kettering Cancer Center View source
The authors saw value in further study.[6]Evaluation of aqueous extracts of Taraxacum officinale on growth and invasion of breast and prostate cancer cells — International Journal of Oncology (2008) View source The split is another sign that leaf and root extracts behave differently in almost every comparison.
What Has Happened in People
The human record is a handful of case reports. The best known, from 2018, describes a 76-year-old man with untreated chronic myelomonocytic leukemia whose blood counts stayed stable while he took papaya leaf extract and dandelion root extract.[8]The Use of Natural Health Products Especially Papaya Leaf Extract and Dandelion Root Extract in Previously Untreated Chronic Myelomonocytic Leukemia — Case Reports in Hematology (2018) View source
- Design: 1 patient, 2 extracts at once, no comparison group.
- What it cannot show: whether either extract caused the change.
- MSKCC's view: it is unclear whether such benefit was due to dandelion.
- Registered trials: a ClinicalTrials.gov search on 8 October 2026 found 0 testing dandelion as a cancer treatment.
A single patient's course is a reason to run a trial, not a reason to change treatment.
Dandelion During Cancer Treatment
If you have cancer and are considering dandelion, the questions that matter are about interactions and safety rather than tumour effects. MSKCC lists several, based on animal and lab studies rather than on patients, and they are reason enough to check first.
- Drug processing: dandelion inhibited the CYP1A2 and CYP3A4 enzymes in animal and lab studies, which may alter drug levels.
- Antibiotics: in rats, dandelion cut peak ciprofloxacin levels by 73%.[9]Effects of Taraxacum mongolicum on the bioavailability and disposition of ciprofloxacin in rats — Journal of Pharmaceutical Sciences (1999) View source
- Diuretics and diabetes drugs: possible additive effects.
- Hormone-sensitive cancers: avoid unless your oncologist agrees.
The general list of the drug interaction cautions applies on top of these. Tell your oncology team about every supplement and tea, including dandelion coffee.
If You Simply Want Dandelion Root
Dandelion root has an honest place as a traditional bitter for mild digestive complaints, and that is the only use we sell it for. It is not a cancer treatment, and nothing on this page suggests otherwise.
- Our capsule: 1,000 mg of dried root, sold as a digestive bitter.
- Not for: treating, preventing or slowing any cancer.
- During treatment: only with your oncology team's agreement.
- Allergy: avoid it with a ragweed or daisy-family allergy.
For that limited use, remedy's dandelion root capsules supply a measured 1,000 mg.
Do Not Take Dandelion Root Without Your Doctor If
- You are having chemotherapy, targeted therapy, immunotherapy or hormone therapy
- You have a hormone-sensitive cancer, such as some breast cancers
- You take lithium, a diuretic or diabetes medicine
- You have gallstones, bile duct problems or liver disease
- You are allergic to ragweed or another daisy-family plant
Frequently Asked Questions
Is there a plant that kills cancer cells? +
Many plant extracts kill cancer cells in dishes, including dandelion root extract in 2011 to 2016 studies. Some approved cancer drugs, such as paclitaxel from the yew tree, came from plants after years of human trials.
What kills cancer cells in the body naturally? +
The immune system destroys some abnormal cells. No food or herb, dandelion included, has been shown in trials to cure cancer, and 0 dandelion cancer trials are published.
What herbs should be avoided during chemotherapy? +
Any herb your oncology team has not approved. MSKCC notes dandelion inhibited 2 drug-processing enzymes in lab and animal studies, which could alter chemotherapy levels.
What teas are safe during chemotherapy? +
Ask your oncology team, because it depends on the drugs. Dandelion root tea is not a cancer treatment, and its effects on 2 drug-processing enzymes are a reason to check first.
What stops cancer cells from growing naturally? +
Healthy cells have built-in brakes, such as programmed cell death. Dandelion root extract triggered that process in cancer cells in dishes, with 0 human trials behind it.
Does dandelion root cure cancer? +
No. There is no evidence it cures or treats any cancer in people. Its anticancer findings come from cells in dishes and tumours in mice, in studies from 2008 to 2016.
Is dandelion tea the same as the extract in the studies? +
No. The studies used a lab-made water extract applied to cells at set concentrations. A cup of tea has never been tested against cancer, and 0 trials exist.
Has dandelion root extract been tested in cancer patients? +
Not in a published trial. The human record is case reports, such as a 2018 report of 1 man with leukemia who took papaya leaf and dandelion root extracts.
Can dandelion root make some cancers worse? +
Possibly, for hormone-sensitive breast cancer: MSKCC notes preclinical signs of increased cell growth. With 0 human data, avoid it unless your oncologist agrees.
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