A recent investigation by CBC’s Marketplace has revealed discrepancies between the SPF numbers listed on sunscreen bottles and the actual protection offered. This disparity could lead consumers to have a false sense of security when relying on sunscreen for sun protection.
Marketplace conducted tests on a popular SPF 50 sunscreen at five accredited labs in Canada and the U.S. The results varied significantly, with each lab providing a different SPF rating: 34, 50, 60, 44, and 15.
The focus of the investigation was on the testing process rather than the specific product tested. Similar studies have highlighted the common variability in sunscreen testing results, raising concerns among experts.
Health Canada, responsible for regulating sunscreens in the country, did not comment on the findings of the Marketplace investigation.
Sunscreen protection is crucial as it shields the skin from harmful UVA and UVB rays, which can cause premature aging and skin cancers. The SPF number on sunscreen bottles indicates the level of protection against UVB rays, not UVA rays. The higher the SPF number, the greater the protection against UVB rays.
Despite the importance of sunscreen, the testing process for SPF values remains subjective, relying on human volunteers. Newer testing methods that do not involve human testing are not yet widely accepted in Canada or the U.S.
Consumers are urged to apply sunscreen generously, as many do not use the recommended amount for adequate protection. Dermatologists emphasize the importance of consistent and proper sunscreen application, highlighting that the SPF number is a rough indicator of protection.
The sunscreen industry has faced instances of fraud, underscoring the need for stricter regulations and transparency in testing practices. Consumers are advised to be vigilant and prioritize sun protection through various measures, including seeking shade and avoiding peak sun hours.
Efforts to enhance sunscreen testing and transparency are ongoing, with calls for manufacturers to retest their products if relying on questionable testing practices. Ultimately, the focus should be on using sunscreen regularly and effectively, rather than fixating on specific SPF numbers as the sole measure of protection.