Avobenzone: Broad-Spectrum UVA Filter for Sun Protection

Technical Introduction

Avobenzone is an oil-soluble, organic UV filter that provides strong protection against long-wave UVA radiation (320–400 nm), which is responsible for skin aging, DNA damage, and pigmentation.

It is the most widely used UVA filter worldwide and is often combined with UVB filters (such as Octocrylene or Octinoxate) to achieve broad-spectrum sun protection.

• Chemical Name: Butyl Methoxydibenzoylmethane

• INCI Name: Avobenzone

• Molecular Formula: C₂₀H₂₂O₃

• Molecular Weight: 310.39 g/mol

• Appearance: Yellow crystalline powder

• Solubility: Soluble in oils, esters, and alcohols; insoluble in water

• UV Absorption Maxima: ~357 nm (covers full UVA range)

Applications

1. Cosmetics & Sun Care

• Sunscreens (creams, sprays, gels, sticks) → Provides long UVA protection.

• Daily skincare → Added to day creams, BB/CC creams, and foundations with SPF.

• Anti-aging products → Prevents photoaging, pigmentation, and collagen breakdown.

• Hair products → Protects hair and scalp from UVA-induced oxidative stress.

2. Photoprotection in Formulations

• Prevents degradation of sensitive ingredients like retinol, vitamin C, and botanical extracts by blocking UVA.

✅ Advantages

• Broad-spectrum UVA coverage (320–400 nm).

• High efficacy in preventing photoaging and deep skin damage.

• Synergistic use with UVB filters for complete protection.

• Cosmetic compatibility → Oil-soluble, blends well in emulsions.

• Proven safety record with decades of global use.

⚙️ Technical Specifications (Cosmetic Grade)

⚠️ Safety & Regulatory Notes

• Regulatory limits:

  • EU, Japan: Up to 5% allowed.

  • USA (FDA): Approved up to 3% in sunscreens.

• Photostability issue: Avobenzone degrades under sunlight exposure → must be stabilized with Octocrylene, Tinosorb S, or Zinc Oxide.

• Safety: Considered safe for topical use; minimal irritation potential.

• Environmental concern: Like many chemical sunscreens, under review for possible reef impact, but less restricted than Oxybenzone or Octinoxate.

❓ FAQ

Q1: What makes Avobenzone different from Octinoxate or Benzophenone-3?
Avobenzone absorbs UVA, while Octinoxate is a UVB filter, and Benzophenone-3 covers both but with weaker UVA protection.

Q2: Why does Avobenzone need stabilizers?
It degrades under sunlight, losing effectiveness. Formulators stabilize it with Octocrylene or encapsulation technologies.

Q3: Is Avobenzone safe for sensitive skin?
Yes, it has a low irritation profile, but must be paired with stabilizers for optimal performance.

Q4: Does it protect against tanning?
Yes, it reduces UVA-induced pigmentation and long-term tanning.

Q5: Can it be combined with mineral sunscreens?
Yes, it is often combined with Zinc Oxide or Titanium Dioxide for full-spectrum coverage.