Cabot Health Breast Health 60 Caps. Breast tissue has receptors for vitamin D. Research has shown that vitamin D may influence cells in how they develop, divide or die, and may stop malignant cells from growing or spreading. Iodine may act as an antioxidant in the breast, to reduce damage caused by free radicals. Selenium is essential for maintaining healthy thyroid function by facilitating the conversion of T4 thyroid hormone into the active form T3. Zinc plays an important role in supporting healthy thyroid function and supporting the immune system.