How often should sunscreen be reapplied during sun exposure?

Sunscreen should be reapplied every two hours during sun exposure for optimal protection against harmful UV rays. This frequency is essential because sunscreen can wear off due to several factors, including sweating, swimming, or even towel drying. The two-hour interval is a guideline based on studies that show how the effectiveness of sunscreen diminishes over time, particularly in outdoor conditions where direct sunlight can break down the active ingredients.

Reapplying every two hours helps ensure that the skin remains adequately protected throughout the duration of sun exposure, reducing the risk of sunburn and long-term skin damage. It is also important to reapply after activities that may remove sunscreen, such as swimming or excessive sweating. By adhering to this guideline, individuals can help maintain a consistent level of protection against UV radiation.