A carefully formulated 3-in-1 mix, Nature Made Wellblends Immune & Respiratory contains components that offer improved immune support. A carefully formulated 3-in-1 blend, Nature Made Wellblends Immune & Respiratory contains components that offer improved immune support. Let's start with EpiCor, a postbiotic component with a history of scientific validation that promotes respiratory health, nasal wellness, and a balanced immune response. Postbiotics are bioactive substances that are produced when the beneficial bacteria in your gut break down prebiotics and fermented fiber. They have a number of health advantages for your body. Through its role as an antioxidant, vitamin C supports the immune system by scavenging the body's free radicals. The optimal form of vitamin D for the body is vitamin D3, which supports a strong immune system. With Nature Made Wellblends Immune & Respiratory, you can support your immune system and more. EpiCor is a clinically proven postbiotic that supports nasal health, respiratory wellness, and a healthy immune response. Vitamin C functions as an antioxidant to help support the immune system by neutralizing free radicals in the body.