Iowa Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The primary function of SPF, or Sun Protection Factor, in skincare products is to protect the skin from UV radiation. SPF measures the level of protection a sunscreen offers against the sun's harmful ultraviolet rays, specifically UVB rays, which are responsible for sunburn and can contribute to skin cancer. Using products with SPF helps to shield the skin from these damaging effects, making it a crucial aspect of any skincare regimen focused on preventing skin damage and promoting overall skin health.

The other options, while beneficial for skin care, do not align with the specific purpose of SPF. Moisturizing the skin is more related to hydrating products rather than sun protection. Enhancing skin tone often refers to products that include pigments or brightening ingredients, which does not involve UV protection. Similarly, providing anti-aging benefits typically results from ingredients targeting skin elasticity and wrinkles rather than sun exposure mitigation. Therefore, the focus of SPF remains solely on UV protection.