Bio-Glucan Plus (incl. Selenium and Vitamin D3) 60 Tablets (order in singles or 5 for trade outer)For a healthy immune system. Beta 1,3 1,6 glucans act as a primer of the innate immune system, the body's first line of defence against infectious organisms. Bio Glucan Plus contains naturally occurring beta 1,3 1,6 glucans as well as SelenoPrecise, a highly absorbable form of organic selenium and vitamin D3, both of which contribute to normal function of the immune system.