Cosmetic ingredient dictionary
Magnesium Oxide in cosmetics: what it is and what it does
Magnesium Oxide is a cosmetic ingredient that absorbs water or oil. Open Beauty Facts finds it in 22 products, most often bath and shower.
By Bravoora teamUpdated Sources checked 2 sourcesHow we check
What does Magnesium Oxide do in a product?
In a cosmetic product, Magnesium Oxide absorbs water or oil, keeps the product's acidity steady and makes a clear product cloudy. The EU’s CosIng database lists these jobs for it: absorbent, buffering and opacifying.
What other names and numbers does Magnesium Oxide have?
- CAS number
- 1309-48-4
- EC number
- 215-171-9
- CosIng reference
- 35110
Which products contain Magnesium Oxide?
Open Beauty Facts finds Magnesium Oxide in the ingredient lists of 22 of the 22,021 products it has a list for, most often bath and shower, deodorants and shower gels.
Products with it, by country of sale: France 10 · United States 5 · United Kingdom 3 · Germany 1.
Counted on 13 October 2026 from Open Beauty Facts, which volunteers fill from real packs: it shows where Magnesium Oxide turns up, not how much of the market it is.
Bravoora reads this ingredient for everyone you shop for: an allergy or intolerance, a vegan or vegetarian diet, a calorie or protein goal, and the labels on supplements and skincare too. Build a profile · For dermatologists, dietitians and doctors
Sources
The job, the description and the EU annex entry are CosIng’s; the fragrance allergens are the EU Annex III names Bravoora’s label checker reads; the product counts are Open Beauty Facts’.
- European Commission: CosIng cosmetic ingredient database (functions, description, EU annex entry)
- Open Beauty Facts: product database, 77,506 products, read 13 October 2026, ODbL
Contains information from Open Beauty Facts, which is made available here under the Open Database License (ODbL). Read the licence · Download this dictionary’s data · How we check
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