Sunscreen effectiveness requires regular reapplication to prevent skin damage

Dermatologists warn that applying sunscreen only once in the morning is insufficient for full-day protection. Factors such as perspiration, skin friction, and sweating can reduce a product's effectiveness by as much as 22.7% in less than four hours, leaving the skin vulnerable to intense midday UV radiation.

Experts recommend reapplying sunscreen at least every two to four hours, especially after swimming, exercising, or towel drying. In regions with constant UV exposure, such as Colombia, maintaining active protection throughout the day is critical. According to the World Health Organization, four out of five skin cancer cases could be prevented by adopting correct application and reapplication habits.

Choosing the correct formula is also essential for efficacy. Individuals with oily or acne-prone skin should seek lightweight, oil-free, and non-comedogenic products, while those with dry or sensitive skin require different textures. Sunscreen should be used alongside other protective measures, such as wearing hats, sunglasses, and seeking shade.