The aim of this study is to evaluate whether treatment with a nasal spray based on resveratrol has some benefit in patients with seasonal allergic rhinitis, mild, moderate, or severe. The primary objective is to assess whether the treatment with nasal spray based resveratrol is able to improve the allergic rhinitis symptoms during the two months of treatment. The secondary aim is to evaluate if the resveratrol nasal spray is able to reduce respiratory infections and wheezing episodes.