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Does the Purple Pigment in Eggplant Stop Melanoma? A Fact Check
A viral post says the pigment in eggplant skin stops melanoma cells. It slowed them in lab dishes, but mouse tumors did not shrink, and eggplant is not a treatment.
Original commentary from the Cancer Explained editorial team.
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“The pigment that turns eggplant skin purple stops melanoma cells, activating a tiny genetic off-switch for cell growth.”
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"The pigment that turns eggplant skin purple stops melanoma cells."
That is the opening of an Instagram post from @hashem.alghaili, shared around November 11, 2026. The study behind it is real. The post's longer caption even includes the key caveats. But the first line is the part most people read, and it goes further than the research.
The study
The paper was published in Scientific Reports on August 11, 2025, by a team led by first author M. Murata in Hirofumi Tachibana's lab at Kyushu University in Japan. So it is not new.
The pigment is delphinidin, one of the anthocyanins that give eggplant skin, blueberries and other dark fruits and vegetables their purple-blue color. The team used purified delphinidin, not eggplant.
In lab dishes, delphinidin reduced the growth of mouse melanoma cells (a line called B16) and of a human melanoma cell line. The researchers traced the effect to a small RNA molecule called let-7b, which acts as a brake on cell division, and to a little-studied gene called Fam222B. When they switched that gene off, delphinidin stopped working.
What happened in mice
This is the part the headline leaves out. The team also gave delphinidin by mouth to mice that had melanoma tumors. Let-7b went up in the tumors, but, in the paper's words, "there was no change in tumor weight."
So the pigment changed a molecule inside the tumors without shrinking them.
What it means for you
- Eating eggplant is not a melanoma treatment. The study used a purified compound, not food, and found no effect on tumor size in mice.
- Lab results are an early step. Many substances slow cancer cells in a dish and never become treatments. The gene the team found may help researchers, which is the real value of the work.
- Vegetables are still good for you. A diet with plenty of vegetables and fruit is part of healthy eating, just not a cancer cure.
The verdict
Misleading headline, real science. Delphinidin slowed melanoma cells in lab dishes, but it did not shrink tumors in mice, and the study did not test eggplant.
If you have melanoma, or are worried about it
Talk to your care team before taking any supplement, including plant extracts sold as "anthocyanins," because some can interact with treatment. See a doctor about a mole that is new, changing, or looks different from your others. Our melanoma guide explains the signs, and our page on supplements and cancer explains what the evidence shows.
Put the story in context
Prevention, possible warning signs, screening, and diagnosis
This story relates to Melanoma. The information below is general, and not every point applies to every cancer. Personal advice depends on age, symptoms, family history, exposures, and medical history.
Prevention and risk reduction
Not every cancer can be prevented. Avoiding tobacco, protecting skin from ultraviolet radiation, limiting alcohol, staying active, and receiving recommended HPV or hepatitis B vaccination can lower the risk of certain cancers. A risk factor is not a prediction or a cause in one individual.
Symptoms and possible early signs
Possible signs vary and are often caused by conditions other than cancer. Changes worth discussing include a new lump, unexplained bleeding or weight loss, a persistent cough, lasting bowel or bladder changes, a changing skin spot, or symptoms that persist or worsen. Some early cancers cause no symptoms.
Screening and early detection
Screening looks for certain cancers before symptoms begin. Recommended tests exist only for some cancers and depend on age and risk. Screening can have benefits and harms; it is not the same as evaluating a new symptom, and there is no single routine scan or blood test that reliably screens for every cancer.
How cancer is diagnosed
Diagnosis may involve a history and exam, imaging, laboratory tests, and often a biopsy. Pathology can identify the cancer type and may test biomarkers that guide treatment. Symptoms, screening results, tumor markers, or online stories alone cannot confirm cancer.
Learn more about melanoma
A news story may encourage questions, but it should not be used to estimate your risk or choose testing. Contact a healthcare professional about a persistent or concerning change. Seek urgent care for severe or rapidly worsening symptoms.