A recent investigation by CBC Marketplace revealed discrepancies between the SPF numbers printed on sunscreen bottles and the actual protection provided. This raises concerns for consumers who rely on sunscreen for sun protection.
Marketplace conducted tests on a popular SPF 50 sunscreen at accredited labs in Canada and the U.S. The results varied significantly, with the labs reporting SPF numbers ranging from 15 to 60. This highlights a lack of oversight in the testing system.
Health Canada, responsible for sunscreen regulation in Canada, did not comment on the investigation’s findings. Experts, including Brian Diffey, a photobiology professor, expressed worries about the accuracy and consistency of SPF testing.
SPF, which stands for sun protection factor, indicates protection against UVB rays but not UVA rays. The higher the SPF number, the greater the protection against UVB rays. However, the percentage of UVB rays absorbed or reflected varies among SPF levels.
Testing for SPF typically involves human volunteers exposed to simulated sunlight. Despite efforts to standardize testing protocols, variability exists due to factors like sunscreen absorption and skin response to UV light.
While sunscreen is essential for skin protection, experts emphasize the importance of using it correctly and not solely relying on SPF numbers. Awareness of potential fraud in the sunscreen industry underscores the need for transparency and vigilance in sunscreen testing and regulation.