What ingredient in sunscreen helps protect the skin from UV rays?

Zinc oxide is a physical or mineral sunscreen agent that serves as a barrier to protect the skin from ultraviolet (UV) rays. It works by reflecting and scattering both UVA and UVB rays, which are harmful to the skin. This makes zinc oxide an effective ingredient for sun protection, as it minimizes the risk of sunburn and long-term skin damage caused by UV exposure.

In contrast, while Vitamin E is an antioxidant that can help soothe and repair the skin, it does not provide direct UV protection. Hyaluronic acid is primarily known for its hydrating properties and does not offer UV defense. Collagen is a protein that provides structure to the skin but has no protective effect against UV rays. Thus, zinc oxide is specifically recognized for its role in sun protection, making it the correct choice for this question.