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Moumoujus

CI 77947.

Essential CAS 1314-13-2 / COLORANT

CI 77947, recognized as Zinc Oxide, is a foundational mineral ingredient crucial for comprehensive skincare. It functions as a broad-spectrum physical UV filter, providing robust protection against both UVA and UVB radiation. Beyond sun defense, this versatile compound offers substantial anti-inflammatory, antimicrobial, and skin-protective benefits, actively supporting barrier integrity and facilitating wound repair.

Summary

UV filter Astringent Antimicrobial Anti-acne Skin-protective Anti-inflammatory Barrier repair Wound healing

Science

Mechanism of Action

Zinc Oxide operates by creating a physical shield on the skin's surface, reflecting and scattering incoming UVA and UVB rays to prevent dermal photodamage. This protective layer also minimizes external irritation and promotes healing by effectively sealing in moisture. Its anti-inflammatory action involves reducing key mediators such as nitric oxide, while its antimicrobial properties inhibit the growth of acne-causing bacteria. Furthermore, it acts as an astringent to manage excess sebum and accelerates wound healing through immune support and stabilization of cellular membranes.

Research

Clinical Evidence

High confidence
Effective range 1–40%
Optimal

25%

Key findings

  1. 01 Delivers anti-inflammatory and protective advantages in daily facial moisturizers and serums, contributing to skin barrier repair and hydration.
  2. 02 Demonstrated effectiveness for mild inflammatory conditions, significantly enhancing skin barrier function and hydration levels.
  3. 03 Achieves SPF 30 or higher in sunscreens when properly formulated, effectively blocking 80-90% of harmful UV radiation.
  4. 04 Proven efficacious in wart management, with 50% of cases achieving complete resolution within three months, comparable to established acid treatments.
  5. 05 A hyaluronic acid-zinc oxide system exhibited a 16-fold higher selective kill ratio against Cutibacterium acnes versus commensal Staphylococcus epidermidis, highlighting targeted anti-acne potential.

Transparency

Dusting Analysis

Commonly dusted

As a finely powdered material, Zinc Oxide is prone to dusting, requiring careful handling during manufacturing to prevent inhalation. While topically applied Zinc Oxide is safe, the inhalation of its dust has been identified as harmful.

The Formula

Formulation

Solubility
Oil
Optimal pH 7 – 7.5
0 7 14

Stability

Zinc Oxide exhibits negligible solubility in water but readily forms stable dispersions in oil. Its formulation stability is critically dependent on pH, with optimal performance observed between pH 7.0 and 7.5. Deviation below pH 7.0 can induce dissolution of ZnO and zinc ion migration, while exceeding pH 7.5 may lead to the formation of alkaline zinc complexes, both compromising stability. The inclusion of chelating agents, such as 0.1-0.2% w/w disodium EDTA, is recommended to minimize zinc ion migration. Uncoated Zinc Oxide powders can be effectively dispersed in the water phase when co-formulated with a water-soluble emollient.

Synergies

  • Chelating agents (e.g., Disodium EDTA) to enhance formulation stability.
  • Hyaluronic acid for a synergistic anti-acne and selective antimicrobial system.

Conflicts

  • Ionic rheology modifiers (e.g., carbomers) when using uncoated Zinc Oxide.
  • Acrylate-derived polymers, which are sensitive to Zn2+ ions and can lead to instability or textural issues.
  • Highly acidic ingredients (e.g., Ascorbic Acid/Vitamin C), which can diminish efficacy or destabilize the pH.
  • Certain chemical UV filters (e.g., Avobenzone, Octinoxate), as co-formulation can destabilize the overall product.

Safety

Safety Profile

CIR Status
Deferred evaluation
Max tested
25%
Sensitization risk Low

The FDA recognizes Zinc Oxide as safe for topical use in concentrations up to 25% in sunscreens and skin protectants. Similarly, the Scientific Committee on Consumer Safety (SCCS) concluded that both non-nano and specifically characterized nano zinc oxide are safe as UV-filters up to 25% for dermal application. While topically applied Zinc Oxide is broadly safe, ongoing discussions pertain to the potential for increased penetration and inflammatory responses from nano-sized particles in compromised skin, though definitive evidence remains debated.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Essential

CI 77947 is an essential cornerstone in precision skincare, delivering superior broad-spectrum UV protection along with powerful therapeutic benefits for overall skin health, barrier integrity, and the effective management of concerns like acne and inflammation.

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