Source Naturals NK-3 Immune -- 500 mg

What the brand says

Sold as “Source Naturals NK-3 Immune -- 500 mg - 60 Capsules”

NK-3 Immune™ with selenium supports numerous natural immune processes, activating the work of macrophages, T cells, B cells, and natural killer or NK cells, the body's "first line of defense." It stimulates the production of the chemical messengers that activate the body's natural immune response and it also supports a healthy circulatory system.