Beta Glucans & Elderberry Immune 1 Complex is comprised of ingredients shown in research to support the normal function of the immune system. This unique combination of beta 1,3/1,6 glucans, elderberry, Ester-C®, vitamin D3, zinc, copper and selenium, helps support the functioning of the immune system 1 especially during periods where the body could be susceptible to developing an illness, such as during the winter months or stressful periods.