Specific ____ are chemical systems that deliver ingredients to specific tissues of the epidermis.

The term "delivery systems" refers to specialized chemical formulations designed to transport active ingredients through the various layers of the skin, specifically targeting tissues within the epidermis. These systems enhance the effectiveness of the ingredients by ensuring they reach the intended area where they can provide benefits, such as hydration, anti-aging effects, or healing properties.

In cosmetic and skincare science, understanding how delivery systems work is crucial for formulating products that achieve specific therapeutic outcomes. Delivery systems can include encapsulation technologies, liposomes, and other vehicle forms that enhance absorption and efficacy.

Other terms like preservatives, surfactants, and emollients do not serve the same purpose. Preservatives are used to prevent microbial growth in products, surfactants help with emulsification and cleansing, and emollients work primarily to soften and smooth the skin. None of these options are specifically designed to deliver active ingredients to target tissues within the epidermis, making "delivery systems" the correct choice for this question.