Aller-Essentials contains a blend of nutrients and herbal extracts designed to maintain healthy seasonal immune function. EpiCor Saccharomyces cerevisiae fermentate contains numerous immune enhancing bioactive metabolites designed to support both innate and adaptive immune response. Research suggests that it enhances natural killer cell activation, B cell and T cell function, and salivary IgA levels. In a double-blind, placebo-controlled trial involving 96 subjects, EpiCor supported nasal comfort during a 12-week period in the spring. Additionally, it supported salivary IgA levels, an important first-line defense produced by the mucosal tissue. In a randomized double-blind trial involving 75 individuals, Tinospora cordifolia provided significant support for a healthy immune response by maintaining normal nasal function as well as healthy neutrophil and eiosinophil activity. A randomized double-blind, placebo-controlled trial involving apple polyphenols reveals support for maintaining a healthy nasal lining and nasal function. Quercetin, hesperidin and vitamin C provide additional support for stabilizing mast cells.