SPF Scout · Ingredient library

What each ingredient generally does.

Factual, plain-language notes on the ingredients that appear on sunscreen labels — their role in a formulation, nothing more. This library describes function; it never assesses whether an ingredient is right for you.

2484 canonical ingredients · 1107 with reviewed explainers

Every note here describes what an ingredient generally does in a formulation. To read a stored ingredient declaration instead, browse the published records.