According to the Environmental Working Group (EWG), Downy Fabric Softener contains several potentially harmful chemicals, including quaternium-18, benzyl alcohol, fragrance, and dimethicone. Quaternium-18 is a known respiratory toxicant and allergen, while benzyl alcohol and fragrance are both skin irritants and potential respiratory toxicants. Dimethicone is a silicone-based polymer that is considered safe for use in cosmetics and personal care products but can be harmful if ingested or inhaled in large quantities. Therefore, it is recommended to use Downy Fabric Softener with caution and read the label carefully before use.