Alumina (aluminum oxide) is a fine, hard mineral powder used in skincare and cosmetics primarily as a physical exfoliant in microdermabrasion products and as a bulking, opacifying, or anticaking agent in formulations. It is largely inert and not absorbed through intact skin.
| Reported effect | How often | Notes |
|---|---|---|
Mechanical irritation or microabrasion | Common | From its abrasive action, especially in scrubs or microdermabrasion; depends on particle size and pressure. |
Transient redness and stinging | Uncommon | Typically after physical exfoliation, resolving shortly afterward. |
Allergic contact dermatitis | Rare | Aluminum sensitization is uncommon but documented in patch-test cases. |
Granulomatous reaction | Very rare | Reported with aluminum-containing materials, mainly via injection or implantation rather than topical use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.