https://laeyolabs.com/buyer-faqs/sunscreen/sunscreen-preservative-efficacy-testing/
Do sunscreen products need preservative efficacy testing (challenge test), and when? | LAEYO Labs
Yes, sunscreen products usually need preservative efficacy testing (challenge test) for microbial safety, especially water-based formulas. In the Middle East,...
preservative efficacy testingsunscreenproductsneedchallenge