Science
Mechanism of Action
Manganese oxide exhibits a multifaceted mechanism of action on the skin. It acts as a physical UV absorber, providing protection from light-induced damage. Notably, manganese dioxide (MnO2) nanomaterials function as potent antioxidants by reacting with hydrogen peroxide (H2O2) to generate paramagnetic manganese (Mn2+) and oxygen (O2), and by oxidizing glutathione (GSH) to GSSG, thereby contributing to redox balance. Manganese dioxide nanoclusters are specifically effective at scavenging various reactive oxygen species (ROS). Additionally, as a cosmetic colorant (Manganese Violet, CI 77742), it imparts a purple hue and serves as a filler and binder, enhancing texture and application.
Research
Clinical Evidence
Medium confidenceN/A
Transparency
Dusting Analysis
Concerns regarding respiratory exposure exist for manganese oxide in inhalable forms, such as sprays or fine powders, leading to use restrictions. For non-inhalable applications (e.g., solids or liquids), the risk is considerably lower.
The Formula
Formulation
Stability
Manganese Violet (CI 77742) exhibits high stability and colorfastness. While various forms like Manganese Violet and manganese dioxide (MnO2) are primarily insoluble in water, Manganese Violet shows excellent dispersibility in both oil-based and water-based cosmetic formulations. Manganese(II) oxide (MnO) is insoluble in water but soluble in acidic environments. The dissolution and reactivity of MnO nanoparticles are pH-sensitive, with increased Mn2+ release at lower pH (e.g., pH 5) and minimal release at neutral pH (e.g., pH 6.5-7.4). Manganese dioxide is a moderate oxidizing agent.
Conflicts
- Strong reducing agents (for Manganese dioxide)
- Halogen acids (for Manganese dioxide)
- Oxalic acid (for Manganese dioxide)
- Sulfur dioxide (for Manganese dioxide)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has not specifically evaluated Manganese Oxide. However, Manganese Violet (CI 77742), a related form, is approved by the FDA as a safe color additive for cosmetics, including lip and eye areas, subject to heavy metal regulations. The EWG Skin Deep database notes use restrictions for inhalable forms due to respiratory concerns, while posing a lower risk in non-inhalable products. Some individuals may experience skin irritation or allergic reactions, thus patch testing is advised prior to widespread use.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Manganese Oxide is a valuable ingredient, offering significant antioxidant and UV-shielding benefits, with potential for addressing inflammatory skin conditions, though careful consideration of its form and application is necessary due to safety notes regarding inhalable formats and individual sensitivities.
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