SPF Testing Results Disparity between US and Canada.

MicroformulationMicroformulation Member, Professional Chemist
I have a client for whom we developed a sunscreen. It has been produced for a couple of years now in the US without issue. It tested out at a US Testing Lab at 30 SPF.

Recently the client has decided to use a Canadian Testing Facility for various reasons. The issue was that immediately on testing they assigned an SPF of only 23 or so. Their testing is following the Health Canda protocol. I have been told by others that in their experience Canadian testing methods have come in 3-7 SPF points lower for them (one source was a friend at a company that does just Sunscreens, large company).

Has anyone had this issue? I am reaching out to a Regulatory Specialist since there is some grey area as to if these testing protocols performed in Canada will be accepted by the FDA.

I have strong confidence in the Formulation since it has passed US testing on two separate occasions. Any help is appreciated.
markfuller@microformulation.com Microformulation.com Microformulation Cosmetic Consulting provides Custom Formulations for both large Commercial accounts as well as smaller entrepreneurs. We can provide Naturally compliant Formulations under the NSF, NPA, Whole Foods and USDA Organic Certifications. BS.Pharm Albany College of Pharmacy, Union University.

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