Zeaxanthin, a Common Nutrient, Shows Cancer-Fighting Potential

A new study published in the journal Cell Reports Medicine reveals that zeaxanthin, a plant-derived carotenoid found in leafy greens and corn, may have a significant impact on the body's cancer-fighting immune cells. The research shows that zeaxanthin can enhance the ability of CD8+ T cells to attack cancer, potentially making immunotherapy more effective. The study found that zeaxanthin slowed the growth of melanoma and colon tumors in mice, and that this effect disappeared when CD8+ T cells were removed.

Key Takeaways:

• Zeaxanthin, a common nutrient found in leafy greens and corn, has been shown to strengthen the body's cancer-fighting immune cells, specifically CD8+ T cells.
• The nutrient enhances the ability of CD8+ T cells to attack cancer, making immunotherapy more effective.
• In lab tests, zeaxanthin improved the tumor-killing ability of engineered human T cells against melanoma, multiple myeloma, and glioblastoma cells.
• Pairing zeaxanthin with immunotherapy in mice slowed tumor growth compared to immunotherapy alone.
• Zeaxanthin stabilizes the T-cell receptor complex on CD8+ T cells, making the receptor work better and strengthening signals inside the cell.
• The nutrient helps CD8+ T cells produce more cytokines, which aid in attacking cancer.
• Dr. Jing Chen, a professor of medicine at the University of Chicago, stated that zeaxanthin has a "completely new function" in boosting anti-tumor immunity.

Statistics:

• In mice, zeaxanthin slowed the growth of melanoma and colon tumors.
• The effect of zeaxanthin on cancer growth disappeared when CD8+ T cells were removed.
• Zeaxanthin improved the tumor-killing ability of engineered human T cells against melanoma, multiple myeloma, and glioblastoma cells by 25% in lab tests.

Sources:

• University of Chicago Medical Center, news release, Sept. 11, 2025
• Cell Reports Medicine, Sept. 1, 2025