**Avobenzone** (Butyl Methoxydibenzoylmethane) is a **broad-spectrum UV filter** widely used in **sunscreens and skincare products**. Its key applications include:
### **1. UVA Protection**
- One of the few FDA-approved filters effective against **long-wave UVA rays (320–400 nm)**, which cause **skin aging, wrinkles, and DNA damage**.
### **2. Sunscreen Formulations**
- Often combined with **UVB filters** (like Octinoxate or Octocrylene) for **full-spectrum protection**.
- Requires **stabilizers** (e.g., Octocrylene, Tinosorb S) because it **degrades in sunlight**.
### **3. Cosmetic & Daily Skincare**
- Found in **moisturizers, foundations, and SPF lotions** for daily UV defense.
### **4. Limitations**
- **Photounstable** (breaks down in sun) unless stabilized.
- Can cause **irritation** in sensitive skin.
- Approved in the **US, EU, and other regions**.
Avobenzone remains a **key UVA filter** but is increasingly paired with more stable alternatives like **Tinosorb or DHHB**.
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