Allergena is a top selling, allergy relief brand, that was developed for the Progena Professional Formulations product line. Allergena's homeopathic remedies incorporate the concept of sublingual immunotherapy by delivering a diluted mixture of common allergens for use under the tongue. It is a safe, effective and natural alternative to common pharmaceutical and over the counter medicines. Allergena's success began with health professionals across the United States in the early 1980's. Consumer demand provided opportunity for Allergena to expand into retail health food stores by the mid 1990's. Today, it is available online, at health professional clinics and through retail stores across the country. Allergena has become a trusted leader in homeopathic allergy relief products for tree, weed and grass allergies as well as mold, dust, fragrances and pet dander.