Sunscreen should have a minimum SPF rating of what to be effective?

Sunscreen with a minimum SPF rating of 15 is recognized as effective for providing protection against the harmful effects of UV rays. An SPF of 15 blocks approximately 93% of UVB rays, which are the primary cause of sunburn and contribute to skin cancer. The general guideline is that for adequate sun protection, especially for prolonged exposure to sunlight, an SPF of 15 or higher is recommended. This rating balances effectiveness with accessibility, ensuring that individuals can find appropriate products while encouraging sufficient application to achieve the labeled protection. Higher SPFs do offer more protection, but SPF 15 serves as a widely accepted minimum standard for everyday use, particularly for those who may have lighter skin or spend longer periods outdoors.