Avobenzone (INCI: Butyl Methoxydibenzoylmethane, CAS 70356-09-1) is an organic (chemical) UV filter that provides broad UVA protection with peak absorption at approximately 357 nm. It is one of the most widely used chemical UVA filters worldwide and remains the primary chemical UVA filter approved for use in the United States (max 3%) and one of the most common in the EU (max 5%, Annex VI entry 8). Unlike mineral UV filters (Zinc Oxide, Titanium Dioxide), avobenzone works by absorbing UVA radiation and converting it to heat within the sunscreen film and upper skin layers (stratum corneum). Systemic absorption can occur — FDA maximal use studies (2019/2020) detected plasma concentrations of 3.4–7.1 ng/mL — but the UV-filtering action takes place at the skin surface, not through systemic absorption. Exceeding the FDA's 0.5 ng/mL threshold for additional safety evaluation, though without established clinical harm to date. A key limitation is photostability: avobenzone degrades under UV exposure and must be formulated with stabilisers (such as octocrylene or Tinosorb S). SkinSenseDiary safety rating: 3/10 (low risk). No allergen flags. No harmonised human health GHS classification. Found in 4,544 products.
Avobenzone (INCI: BUTYL METHOXYDIBENZOYLMETHANE, CAS 70356-09-1) is a synthetic organic compound belonging to the dibenzoylmethane class. It has an EC number of 274-581-6 and a molecular weight of 310.39 Da. At room temperature, it is a pale yellow powder that is oil-soluble. Avobenzone was first introduced as a sunscreen active ingredient in the 1980s and has since become one of the most widely used chemical UVA filters in the world — appearing in 4,544 products in our database. It is commonly known by the trade name Parsol 1789. The INCI name used in the EU and on most ingredient lists is Butyl Methoxydibenzoylmethane, while the US FDA refers to it simply as Avobenzone.
As a chemical (organic) UV filter, avobenzone works by absorbing UVA radiation (320–400 nm) with peak absorption at approximately 357 nm and converting the UV energy to heat through a photochemical process. This is a fundamentally different mechanism from mineral UV filters (Zinc Oxide, Titanium Dioxide), which work primarily by absorbing and scattering UV radiation while remaining on the skin surface. Its UV-filtering action occurs within the sunscreen film and the stratum corneum — avobenzone does not need to penetrate deeply to work. However, systemic absorption does occur: FDA maximal use studies published in JAMA (2019, 2020) detected mean maximum plasma concentrations of 3.4–7.1 ng/mL depending on formulation type, exceeding the FDA's 0.5 ng/mL threshold that triggers the need for additional non-clinical toxicology assessment. No clinical harm has been established from these systemic levels to date.
A well-known limitation of avobenzone is its inherent photostability problem. When exposed to UV radiation, avobenzone undergoes keto-enol tautomerisation that can lead to irreversible degradation — losing its UV-filtering capacity within approximately 30 minutes of unprotected UV exposure. This is why modern avobenzone sunscreens always include photostabilising agents such as octocrylene, Tinosorb S (bis-ethylhexyloxyphenol methoxyphenyl triazine), or Tinosorb M to prevent degradation. When properly stabilised, avobenzone maintains effective UVA protection throughout normal reapplication intervals. Additionally, avobenzone reacts with chlorinated water and UV light to produce degradation products whose long-term safety profiles are not fully characterised. The US FDA currently classifies avobenzone as Category III (insufficient data to determine GRASE status), while it remains permitted in the EU at up to 5% without specific safety concerns noted by the SCCS for dermal use at approved concentrations.
Avobenzone is the gold standard chemical UVA filter, with peak absorption at approximately 357 nm — right in the heart of the UVA spectrum responsible for photoaging, hyperpigmentation, and DNA damage in deeper skin layers. It provides the broadest and most effective UVA coverage of any single chemical UV filter currently approved in the US. UVA radiation accounts for ~95% of UV reaching the Earth's surface and penetrates deeper into the skin than UVB, making avobenzone's UVA-specific protection critical for anti-aging and skin cancer prevention.
Unlike mineral UV filters (Zinc Oxide, Titanium Dioxide) that sit on the skin surface and can leave a visible white residue, avobenzone is absorbed into the skin and is completely invisible once applied. This makes it the preferred UVA filter for darker skin tones and for consumers who prioritise cosmetic elegance. Avobenzone-based sunscreens offer a lightweight, non-greasy feel and blend seamlessly under makeup, which significantly improves daily compliance with sunscreen use.
Avobenzone can be formulated into a wide range of product formats — lotions, creams, sprays, gels, serums, and tinted products. Its oil-soluble nature allows flexible formulation options. It combines readily with UVB-specific filters (such as octinoxate, octocrylene, and homosalate) and with photostabilisers to create comprehensive broad-spectrum sunscreens. This formulation versatility has made it the backbone of most chemical sunscreen products worldwide.
Avobenzone is one of the most widely approved UV filters globally — permitted in the EU (max 5%), US (max 3%), Japan, Korea, Australia, and most other jurisdictions. It is the primary chemical UVA filter used in US OTC sunscreens. This broad regulatory acceptance, spanning over 40 years of commercial use, means that consumers have access to avobenzone-based sunscreens regardless of where they live — an important factor for those who travel frequently.
Suitable for: Most skin types, including normal, oily, combination, and acne-prone skin. Particularly appealing for those who dislike the white cast of mineral sunscreens. Those with very sensitive, reactive, or post-procedure skin may prefer mineral UV filters (Zinc Oxide, Titanium Dioxide) which do not penetrate the skin. Individuals who wish to minimise systemic absorption may also prefer mineral alternatives.
Avobenzone carries a SkinSenseDiary safety rating of 3/10 — low risk. It is permitted worldwide at concentrations up to 5% (EU) and 3% (US). Unlike mineral UV filters, avobenzone is systemically absorbed — FDA studies detected plasma levels of 3.4–7.1 ng/mL, exceeding the 0.5 ng/mL threshold for additional safety evaluation, though without established clinical harm to date. The SCCNFP (2001) found no estrogenic activity. No harmonised human health GHS classification. No allergen flags. Key limitations: photostability (requires stabilisers), endocrine activity debate, and chlorinated water degradation. Found in 4,544 products.
Photostability — degrades under UV light: Avobenzone is inherently photounstable and begins to degrade within approximately 30 minutes of UV exposure. When it absorbs UVA radiation, it undergoes keto-enol tautomerisation that can lead to irreversible loss of UV-filtering capacity. Modern sunscreen formulations address this by including photostabilisers (octocrylene, Tinosorb S, Tinosorb M, or newer stabilising agents). Always check that your avobenzone sunscreen contains a stabiliser — without one, UVA protection diminishes rapidly.
Systemic absorption — exceeds FDA safety threshold: Unlike mineral UV filters that remain on the skin surface, avobenzone's UV-filtering action occurs in the sunscreen film and upper skin layers (stratum corneum) — it does not need to enter the bloodstream to work. However, systemic absorption does occur: FDA maximal use studies (JAMA 2019, 2020) measured mean maximum plasma concentrations of 3.4–7.1 ng/mL — well above the FDA's 0.5 ng/mL threshold that triggers the requirement for additional non-clinical toxicology studies. Exceeding this threshold does not mean the ingredient is harmful — it means additional safety data are needed. No clinical harm has been established from these systemic levels to date. A 2025 comprehensive toxicology review concluded that avobenzone is unlikely to pose a risk to human health when used at permitted concentrations.
Endocrine activity — debated: The TEDX (The Endocrine Disruption Exchange) listed avobenzone as a potential endocrine disruptor in 2015. Cellular studies have shown that avobenzone may block testosterone effects at low doses. A 2022 zebrafish study found thyroid hormone disruption from avobenzone exposure. However, the SCCNFP (2001) found no estrogenic activity in both in vitro and in vivo assays at concentrations relevant to cosmetic use. The clinical relevance of these findings at approved sunscreen concentrations in humans remains uncertain and is an area of ongoing scientific investigation.
Chlorinated water degradation: Avobenzone reacts with chlorinated water (swimming pools) and UV radiation to produce degradation by-products — a 2016 study identified 25 transformation products. The long-term safety profiles of these degradation products are not fully characterised. If you swim frequently in chlorinated pools, consider reapplying sunscreen after swimming or using mineral sunscreen alternatives for pool days.
Avobenzone's safety during pregnancy is less well-established compared to mineral UV filters. Unlike Zinc Oxide and Titanium Dioxide — which do not significantly penetrate intact human skin — avobenzone is systemically absorbed, with FDA studies detecting plasma concentrations of 3.4–7.1 ng/mL. There are no specific reproductive toxicity studies in pregnant humans, and avobenzone has no harmonised GHS reproductive or developmental toxicity codes (no H361d, no H362). The TEDX list (2015) includes avobenzone as a potential endocrine disruptor, though the SCCNFP (2001) found no estrogenic activity. Many dermatologists advise that pregnant individuals who wish to minimise systemic exposure may consider mineral sunscreen alternatives (Zinc Oxide, Titanium Dioxide in non-spray formats). However, any sunscreen use is preferable to unprotected UV exposure during pregnancy — the risk of UV damage from not wearing sunscreen is well-established, while harm from avobenzone at approved concentrations has not been demonstrated. Consult your healthcare provider for individualised advice.
Unlike mineral sunscreens that provide immediate protection, chemical UV filters like avobenzone need time to absorb into the skin and form an effective UV-absorbing layer. Apply your avobenzone sunscreen at least 15–20 minutes before going outdoors. This wait time is important for optimal UV protection — applying it at the door on your way out means your skin is unprotected during the initial absorption period.
For the face alone, use approximately two finger-lengths of product (about 1/4 teaspoon or 1.25 ml). Apply evenly across the face, ears, and neck. For the body, approximately 35 ml (about 7 teaspoons) is needed for full coverage. Chemical sunscreens like avobenzone may feel lighter than mineral formulations, but adequate application is equally critical — under-application dramatically reduces the effective SPF and UVA protection.
Reapplication is critical for all sunscreens, but particularly important for avobenzone-based products due to its photostability limitations. Even with stabilisers, protection gradually diminishes with UV exposure. Reapply every 2 hours during prolonged sun exposure, and immediately after swimming, heavy sweating, or towel-drying. For office workers with minimal sun exposure, a morning application with a midday touch-up is generally sufficient.
Before purchasing an avobenzone sunscreen, check the ingredient list for photostabilisers — octocrylene, Tinosorb S (bis-ethylhexyloxyphenol methoxyphenyl triazine), Tinosorb M, or Mexoryl SX/XL. Without a stabiliser, avobenzone's UVA protection degrades rapidly under UV exposure. Most reputable sunscreen brands include stabilisers, but it is worth verifying — especially for drugstore or budget formulations.
Avobenzone combined with UVB filters (octocrylene, homosalate, octinoxate) for full broad-spectrum coverage. Lightweight, no white cast, cosmetically elegant. Most common sunscreen format worldwide. SPF 30–50+ available.
Combines avobenzone with mineral filters (Zinc Oxide or Titanium Dioxide) for enhanced broad-spectrum coverage. May offer better photostability since mineral filters don't degrade. Slight white cast possible. Good compromise between elegance and mineral protection.
Avobenzone in tinted formulations, BB creams, or SPF moisturisers. Provides UVA protection with skin-evening coverage. Convenient for daily wear. Ensure SPF is 30+ and the product lists a photostabiliser alongside avobenzone for reliable protection.
The most common avobenzone stabiliser. Octocrylene absorbs the energy that would otherwise degrade avobenzone, maintaining UVA protection over time. Also provides moderate UVB protection. Most avobenzone sunscreens include octocrylene for this reason.
An excellent complement to chemical sunscreen. Niacinamide strengthens the skin barrier, has anti-inflammatory properties, and helps with post-UV repair. No interaction with avobenzone. Apply niacinamide serum first, then avobenzone sunscreen on top.
Combining avobenzone with mineral filters creates a hybrid sunscreen with enhanced broad-spectrum protection and improved photostability (mineral filters are inherently stable). The trade-off is a slightly heavier texture and possible mild white cast.
Octinoxate can actually destabilise avobenzone — the two molecules interact in a way that accelerates avobenzone photodegradation. While many older sunscreens combined both, modern formulations increasingly avoid this pairing or include additional stabilisers to mitigate the interaction. Check your sunscreen formula carefully.
High concentrations of iron oxides (as in heavily tinted products) can theoretically interact with avobenzone. In practice, most tinted avobenzone sunscreens are formulated to account for this. However, layering a separate heavy-coverage iron oxide product over an avobenzone sunscreen may affect stability.
Retinoids are typically used at night and increase photosensitivity, making sunscreen essential the following day. Avobenzone sunscreen is an acceptable option for retinol users, but individuals with retinoid-sensitised skin may find chemical filters slightly more irritating than mineral alternatives. Monitor your skin's tolerance.
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