The Mineral Sunscreen SPF 30 PA+++ is a 100% Mineral Non-Nano Zinc Oxide Sunscreen. The active ingredient - Zinc Oxide - is naturally occurring and considered to be a safer alternative for reefs vs chemical screens. The Sunscreen SPF 30 PA+++ also does not contain Silicones, Parabens or PEGs. No verified testing protocol is available to back a reef safe claim. The Sunscreen SPF 30 PA+++ has therefore not undergone a reef-safe test.