When should sunscreen be applied for maximum effectiveness?

For maximum effectiveness, sunscreen should be applied 15-30 minutes before sun exposure. This time frame allows the sunscreen ingredients to properly bind to the skin and provide an effective barrier against harmful UV rays. Applying it too close to the time of sun exposure may not give the sunscreen enough opportunity to fully take effect, leaving the skin vulnerable to sun damage.

Using sunscreen only indoors, just before going to bed, or reapplying every hour does not optimize its protective benefits. While reapplication is important, especially if swimming or sweating, the initial application is crucial to ensure adequate protection when first exposed to the sun.