Nutrient May Enhance Cancer Treatment Efficacy

Zeaxanthin, a plant-based compound, could boost the power of cancer immunotherapies, study finds.

Apr. 11, 2026 at 12:00am

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A ghostly, translucent X-ray image showing the intricate molecular structure of a T-cell receptor, conveying the scientific concept of how a dietary nutrient can boost the immune system's ability to fight cancer.A molecular-level X-ray view reveals how the nutrient zeaxanthin enhances the cancer-fighting power of T cells.Duarte Today

Researchers at the University of Chicago have discovered that zeaxanthin, a common carotenoid best known for supporting eye health, may also help the immune system fight cancer by enhancing the activity of key immune cells. The study shows that zeaxanthin can improve the performance of CD8+ T cells, which play a central role in identifying and destroying cancer cells. When combined with immune checkpoint inhibitors, zeaxanthin produced stronger anti-tumor responses in mice compared to immunotherapy alone.

Why it matters

The findings suggest that zeaxanthin, an inexpensive and widely available supplement, could be a simple way to complement and strengthen advanced cancer treatments like immunotherapy. This discovery highlights the broader importance of diet in immune health and the potential for natural compounds to make cancer therapies more effective.

The details

The researchers found that zeaxanthin helps stabilize the formation of the T-cell receptor (TCR) complex when T cells encounter cancer. This leads to stronger internal signaling, which increases T-cell activation, boosts cytokine production, and improves the cells' ability to kill tumors. In mouse studies, adding zeaxanthin to the diet slowed tumor growth, and the effect became even more pronounced when combined with immune checkpoint inhibitors. The team also tested human T cells engineered to target specific cancer markers, and zeaxanthin enhanced these cells' ability to destroy melanoma, multiple myeloma, and glioblastoma cells.

  • The study, "Zeaxanthin augments CD8+ effector T cell function and immunotherapy efficacy," was published in Cell Reports Medicine on April 11, 2026.

The players

Jing Chen

The Janet Davison Rowley Distinguished Service Professor of Medicine at the University of Chicago and the senior author of the study.

University of Chicago

The institution where the research was conducted.

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What they’re saying

“We were surprised to find that zeaxanthin, already known for its role in eye health, has a completely new function in boosting anti-tumor immunity. Our study show that a simple dietary nutrient could complement and strengthen advanced cancer treatments like immunotherapy.”

— Jing Chen, Janet Davison Rowley Distinguished Service Professor of Medicine

“Our data show that zeaxanthin improves both natural and engineered T-cell responses, which suggests high translational potential for patients undergoing immunotherapies.”

— Jing Chen, Janet Davison Rowley Distinguished Service Professor of Medicine

What’s next

Clinical trials will be needed to determine whether zeaxanthin can improve outcomes for people with cancer.

The takeaway

This discovery highlights the potential for natural, widely available compounds like zeaxanthin to complement and strengthen advanced cancer treatments, making them more effective and accessible for patients.