Active ingredients are the components in a product that produce the desired effect. In pharmaceuticals, for example, these ingredients are responsible for treating specific conditions, such as pain relief or infection. They are carefully selected and tested to ensure they work effectively and safely in the body. In other products, like cosmetics or cleaning supplies, active ingredients serve different purposes, such as moisturizing skin or removing dirt and grime. Understanding the role of active ingredients helps consumers make informed choices about the products they use, ensuring they select items that meet their needs.