Many individuals apply sunscreen but still notice tanning, leading to confusion about its effectiveness. Dr. Shweta Rana, a senior consultant dermatologist at V6 clinics, explains that sunscreen does not provide complete protection from UV rays, particularly UVA rays that cause tanning. She emphasizes that most people apply too little sunscreen, which diminishes its protective qualities. Additionally, sunscreen must be reapplied every two to three hours, especially during outdoor activities, and should be applied 15-20 minutes before sun exposure to allow it to form a protective barrier. Prolonged exposure to the sun, particularly between 10 AM and 4 PM, can also overwhelm even high-SPF sunscreens. To enhance protection, Dr. Rana recommends using broad-spectrum sunscreens with SPF 30 or higher, being generous with application, and incorporating other protective measures like wearing hats and seeking shade during peak sun hours. Ultimately, effective sun protection requires a comprehensive approach beyond just sunscreen.