SPF Scout · Ingredient
Magnesium Oxide
CAS 1309-48-4
What this ingredient generally does
A mineral powder that soaks up excess oil and moisture and buffers the product's acidity. It also adds opacity, making the formula look more solid and less see-through.
Reviewed before publication. This note describes function in a formulation, and nothing else.
Published formulations that list this ingredient
These are the formulations currently published in the SPF Scout catalog whose stored ingredient declaration includes this ingredient. It is not a list of every product on the market, and the order carries no meaning.
No published formulation in the SPF Scout catalog currently lists this ingredient. The catalog is small: only reviewed records are published.
Checking this against your own list
You can select this ingredient in the SPF Scout app as one to flag. The app compares your selections against a product's stored declaration on your device; your list never reaches this website.
This comparison does not predict whether your skin will react.
Where this information comes from
Ingredient names, CAS numbers and recorded functions come from SPF Scout’s curated ingredient dictionary, grounded in CosIng, the European Commission’s Cosmetic Ingredient Database. Content © European Union, reused with acknowledgement.