Science
Mechanism of Action
It forms a physical shield on the skin, reflecting and absorbing UVA, UVB, and UVC rays while aiding barrier function and hydration. Additionally, it offers antimicrobial, astringent, and antioxidant properties, protecting against damage and promoting healing.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Effective for mild inflammatory conditions and skin barrier repair at 5-10%
- 02 Topical 15% ointment significantly reduced common warts after four weeks
- 03 20% ointment comparable to salicylic/lactic acid for wart management, achieving 50% cure within three months
- 04 Effective in managing diaper dermatitis at 5%
- 05 ZnO nanoparticles exhibited potent bactericidal properties against bacteria from 0.5% w/v
- 06 HA/CMC/ZnO gels enhanced cell proliferation in wound healing at 0.05% and 1.0% w/v
- 07 Typically found in sunscreens at 25-30% for effective sun protection
Transparency
Dusting Analysis
Zinc Oxide is effective at low concentrations for some benefits (e.g., wound healing) and significantly higher concentrations for others (e.g., UV protection). Its broad utility across various dose ranges means it is not typically 'dusted' in ineffective trace amounts for marketing claims.
The Formula
Formulation
Stability
Zinc Oxide forms stable dispersions in oils but is nearly insoluble in water. Optimal stability in formulations, especially O/W emulsions, requires a pH between 7.0 and 7.5 to prevent dissolution or alkaline complex formation. Water-in-oil emulsions are often recommended for inorganic sunscreens.
Conflicts
- Ionic rheology modifiers (e.g., carbomers)
- Acrylate-derived polymers
- Ionic emulsifiers (in O/W emulsions)
Safety
Safety Profile
The CIR Expert Panel deferred evaluation due to FDA's safety assessments, which approve it up to 25% in OTC skin protectants and sunscreens. It is generally recognized as safe for topical use, with allergic reactions being rare.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Zinc Oxide is an essential, multi-functional ingredient providing broad-spectrum UV protection, anti-inflammatory, antimicrobial, and skin-healing benefits for all skin types.
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