# SPF secrets: Investigating sunscreen | Marketplace Source: https://www.youtube.com/watch?v=An-8IQ5fluQ Recap page: https://rapidrecap.app/video/An-8IQ5fluQ Generated: 2026-03-08T17:27:19.92+00:00 --- ## Quick Overview Marketplace investigation reveals that sunscreen SPF ratings are inconsistent, with products labeled SPF 50 testing as low as SPF 15, and many manufacturers do not retest products when the formula changes, leading to potentially dangerous under-protection. **Key Points:** - Marketplace tested five SPF 50 sunscreens, finding their actual protection levels ranged from SPF 15 to SPF 60. - One product labeled SPF 50 tested at SPF 34, while another tested at SPF 60, indicating significant inconsistency. - A mineral sunscreen stick failed to provide full coverage on the face, leaving white patches visible under UV light (14:23). - Health Canada does not require companies to retest sunscreens if the formula changes, only if the SPF label changes, which allows products to remain on shelves with potentially inaccurate protection. - Dr. Julia Carroll notes that even SPF 30 allows 3% of UVB rays through, and the exact amount applied matters significantly for achieving the labeled protection. - The investigation used specialized equipment to measure UV penetration, contrasting the results with the labeled SPF claims. ![Screenshot at 14:23: The host demonstrates how a mineral sunscreen stick leaves visible white residue on her forehead and face when applied, illustrating the difficulty consumers face in achieving the correct, even application required for accurate SPF performance.](https://ss.rapidrecap.app/screens/An-8IQ5fluQ/00-14-23.jpg) **Context:** This Marketplace investigation examines the reliability of sunscreen SPF (Sun Protection Factor) ratings in Canada, questioning whether consumers receive the protection advertised on product labels. The segment features interviews with dermatologist Dr. Julia Carroll and Bryan Eckelfield from AMA Labs, who conducted independent testing on commercially available sunscreens. The investigation highlights that consumers may be applying far less protection than expected, leading to risks like skin cancer, especially for those with darker skin tones or a history of skin cancer. ## Detailed Analysis The Marketplace investigation concludes that SPF ratings on sunscreen sold in Canada are often highly inconsistent, leading consumers to believe they are protected when they are not. Bryan Eckelfield of AMA Labs tested several sunscreens, including one labeled SPF 50, which yielded a laboratory result of only SPF 15. Another product labeled SPF 50 tested at SPF 34, while a third tested at SPF 60, showing wide variability even among products claiming the same protection level. Eckelfield emphasizes that the testing process itself is crucial, comparing results against a control standard. Dr. Julia Carroll, a dermatologist, explains that SPF measures protection against UVB rays (which cause burning) but not UVA rays (which cause aging and cancer), emphasizing the need for 'broad spectrum' coverage. She also notes that people typically apply far less sunscreen than the amount used in lab testing (2 mg/cm²), meaning the actual protection received is much lower than the label suggests. For example, SPF 30 blocks about 97% of UVB rays, leaving 3% exposure, whereas SPF 50 blocks about 98%, leaving 2% exposure; this small difference is critical when application is insufficient. The investigation showed that sunscreen stick formulas were particularly difficult to apply evenly, leaving noticeable gaps under UV light (12:08). Health Canada does not currently require companies to retest products unless the formula changes significantly, leading to concerns that older, untested batches might still be sold with inaccurate, lower protection. ### SPF Testing Results - SPF 50 product tested as low as SPF 15 - SPF 50 product tested at SPF 34 - One product tested at SPF 60 - Testing involved applying 2mg/cm² of product to test sites on volunteers' backs. ### UV Protection Science - SPF measures protection against UVB rays (burning); UVA protection is separate but necessary (broad spectrum). - UVB (burning rays) are blocked almost entirely by SPF 30 (97%) vs. SPF 50 (98%), but the difference is significant with under-application. ### Application Issues - Sunscreen sprays are easily lost to the wind, and sunscreen sticks often leave visible white patches (indicating missed spots) when applied by consumers (14:23). ### Regulatory Concerns - Health Canada does not mandate retesting of sunscreens unless the formula changes, meaning products on the shelf may not reflect current testing standards (17:51). ### Survivor Testimony - Skin cancer survivor Annette Seer discussed her 12-year battle, emphasizing the importance of sun safety and urging consumers to be diligent despite regulatory oversight (06:03). ![Screenshot at 00:03: An interview segment begins with a woman in a red cardigan, who is later identified as the reporter.](https://ss.rapidrecap.app/screens/An-8IQ5fluQ/00-00-03.jpg) ![Screenshot at 01:06: Dr. Julia Carroll, a dermatologist, explains the importance of sunscreen use while standing in her clinic.](https://ss.rapidrecap.app/screens/An-8IQ5fluQ/00-01-06.jpg) ![Screenshot at 01:45: A slide presentation defines SPF as Sun Protection Factor, which measures protection against UVB rays.](https://ss.rapidrecap.app/screens/An-8IQ5fluQ/00-01-45.jpg) ![Screenshot at 06:32: A close-up shot uses UV imaging to show how much sunscreen was missed on a volunteer's skin compared to the area that received proper coverage.](https://ss.rapidrecap.app/screens/An-8IQ5fluQ/00-06-32.jpg)