When the Seal of approval appears on a product, you know the product has been scientifically tested to prove it is efficient at reducing or removing allergens from the environment or the products have significantly reduced allergen or chemical content. In order to receive the Seal of Approval, manufacturers have supplied verifiable results of independent testing or testing has carried out via AFSA by independent laboratories to standards created for the Seal of Approval by leading allergy specialists. Due to patient variation, however, use of these products cannot be guaranteed to reduce symptoms in allergic sufferers.