Synergic Efficacy of a Multicomponent Nutraceutical Add-On Therapy in Seasonal Allergic Rhinitis in Children: A Prospective, Randomized, Parallel-Group Study

Background: Emerging evidence suggests that nutraceuticals, alongside standard therapy, may benefit children with allergic rhinitis (AR). This study aimed to compare the efficacy of Quertal (R) (Neopharmed Gentili S.p.A., Milano, Italy), a nutraceutical supplement based on Perilla frutescens, Quercetin, and vitamin D3, combined antihistamines per os versus antihistamines alone, in improving AR symptoms considering respiratory functional and laboratory biomarkers in pediatric age. Materials and Method: This study included 100 children, 50 in the case group (Quertal (R) plus antihistamines) and 50 in the control group (antihistamines alone), with mild/moderate AR sensitized to grass pollens. They underwent assessments of respiratory function (rhinomanometry-AAR, spirometry), inflammation markers (Nasal Nitric Oxide [nFeNO]; exhaled Nitric Oxide [eFeNO]; nasal cytology), and laboratory assays (blood eosinophils, total IgE and specific IgE to Phl p1). Results: After three months of treatment, the case group showed statistically significant improvement in nFeNO and eFeNO values compared to controls (p < 0.001), as well as a reduction in nasal eosinophils (p < 0.001). Conclusions: Adding Quertal (R) to standard antihistamine therapy may reduce nasal inflammation and improve AR symptoms in pediatric patients. This combination therapy shows promise as a practical, well-tolerated approach to managing AR and may have broader implications for enhancing long-term outcomes.