BioActive Selenium & Zinc 150. Contributes to normal function of the immune system. Pure, organically bound selenium yeast (SelenoPrecise), zinc and vitamins B6, C and E. Selenium and zink supports the normal function of the immune system. Vitamin E contributes to the protection of cells against oxidative stress. Vitamin C supports normal collagen formation for the normal function of bones, gums, teeth and cartilage. Vitamin B6 contributes to normal psycological function. Optimized over 25 years of research