Flip over any US sunscreen and you'll find the 'Drug Facts' box with a list of active ingredients and their percentages. Unlike the ingredients list on a moisturizer or serum, these actives are regulated by the FDA as OTC drug ingredients — each one has been individually evaluated and approved for use within specific concentration limits. There are roughly 16 filters currently allowed under FDA rules, though not all are in common use. Understanding what each one does, which UV ranges it covers, and how they interact will help you read a label with confidence and make smarter SPF choices. This guide covers every FDA-approved filter, what's notably absent, and how to spot a well-formulated sunscreen.
How to Read a US Sunscreen Label
US sunscreens are regulated as OTC drugs, which means they must display a 'Drug Facts' panel — the same format you see on pain relievers and antacids. The active ingredients section lists each UV filter by its generic name and concentration percentage. Everything else on the label (moisturizing agents, fragrances, preservatives, soothing extracts) appears in the regular cosmetic ingredients list beneath the Drug Facts box.
The FDA sets maximum allowed concentrations for each active. A filter used above its maximum isn't allowed; combinations of filters are evaluated together for total UV coverage. When a label says 'broad spectrum,' it means the product has passed the FDA's critical wavelength test, confirming meaningful UVA coverage in addition to UVB. 'Water resistant (80 minutes)' means it maintains its labeled SPF for 80 minutes of water exposure before reapplication is needed.
- Active ingredients: the UV filters, listed with percentages — this is the sun protection portion of the label.
- SPF number: how much UVB is blocked (30 = ~97%, 50 = ~98%).
- Broad spectrum: means UVA critical wavelength ≥370nm; this label is FDA-regulated.
- Water resistant: 40 or 80 minutes; no US sunscreen may claim to be 'waterproof' or 'sweatproof.'
- Inactive ingredients: moisturizers, emulsifiers, preservatives, fragrance — these affect texture and skin compatibility but are not the UV filters.
If a US sunscreen doesn't say 'broad spectrum,' it only claims UVB (SPF) protection — no UVA coverage is guaranteed.
Mineral UV Filters: Zinc Oxide and Titanium Dioxide
Zinc oxide and titanium dioxide are the only two UV filters the FDA classifies as 'generally recognized as safe and effective' (GRASE) as of its 2019 proposed rule update. This status reflects their long track record of use and favorable safety data. Both are inorganic (mineral) filters that work by reflecting and scattering UV light, though at a molecular level they also absorb UV energy.
Zinc oxide is the more versatile of the two. It covers both UVB (280-315nm) and the full UVA spectrum — including long-wave UVA-I (340-400nm), which is associated with deep photoaging. This makes zinc oxide the best single-filter option for broad UV coverage available in the US. It's approved up to 25% concentration. At high concentrations it tends to leave a white cast, though modern micronized and nano-sized zinc oxide particles significantly reduce this. Titanium dioxide provides strong UVB and short-wave UVA-II coverage but has more limited UVA-I protection compared to zinc oxide. Maximum allowed concentration is 25%.
- Zinc oxide: UVB + full UVA (best single-filter US option for long-wave UVA-I); allowed up to 25%; best mineral choice for complete coverage.
- Titanium dioxide: UVB + UVA-II; allowed up to 25%; works well paired with zinc oxide for complementary coverage; typically lighter on skin in some formulas.
- Zinc oxide + titanium dioxide together: very common combination; complementary UV ranges; often used to balance UVA depth and cosmetic feel.
If you want a mineral sunscreen with the best available UVA coverage in the US, zinc oxide is the key ingredient to look for — ideally as the lead active.
Chemical UVA Filters Available in the US
The most important chemical UVA filter in the US is avobenzone (butyl methoxydibenzoylmethane). It's the only chemical filter approved in the US that covers long-wave UVA-I, making it a critical component in any chemical-only broad-spectrum formula. Avobenzone is approved up to 3% concentration. Its major limitation is photostability — it degrades when exposed to UV light, which reduces its effectiveness over time.
To address this, formulators pair avobenzone with photostabilizing ingredients. Octocrylene (a UVB filter that also stabilizes avobenzone) is frequently used alongside it. Some companies use proprietary photostabilizing systems — Helioplex (Neutrogena) and AvoTriplex (La Roche-Posay US) are two branded examples. The challenge of stabilizing avobenzone is one reason European formulators prefer newer, inherently photostable filters like Tinosorb S.
- Avobenzone (up to 3%): the primary chemical UVA-I filter in the US; must be stabilized to maintain effectiveness.
- Ecamsule (Mexoryl SX): approved in the US in 2006 only for specific La Roche-Posay products; rarely found in US-market formulas; strong UVA-II filter.
- Oxybenzone (up to 6%): UVA-II and UVB filter; effective photostabilizer; subject to FDA additional data requests; Hawaii and several other jurisdictions have banned it from reef-regulated areas.
- Dioxybenzone (up to 3%): UVA-II filter; less common; sometimes used in combination formulas.
Chemical UVB Filters Approved in the US
Several chemical filters in the FDA-approved list focus primarily on UVB (280-315nm). They're typically used in combination to achieve higher SPF values while managing the concentration of any single ingredient.
- Octinoxate / Octyl methoxycinnamate (up to 7.5%): widely used UVB filter; one of the most common in global sunscreens; also banned in Hawaiian reef-protected waters; subject to FDA additional data requests on systemic absorption.
- Octisalate / Octyl salicylate (up to 5%): UVB filter; also helps stabilize avobenzone; mild and well-tolerated.
- Octocrylene (up to 10%): UVB filter that also stabilizes avobenzone; widely used in combination formulas.
- Homosalate (up to 15%): common UVB filter; the FDA proposed lowering the max from 15% to 9% in a 2021 update, citing absorption data — the final rule is pending.
- Padimate O / OD-PABA (up to 8%): older UVB filter; less common in newer formulas.
- Ensulizole / Phenylbenzimidazole sulfonic acid (up to 4%): primarily UVB; often used in lightweight and gel formulas because it's water-soluble.
- Trolamine salicylate (up to 12%): UVB filter; rarely seen in modern US sunscreens.
- Sulisobenzone (up to 10%): UVA-II and UVB; occasionally found in combination formulas.
A combination of avobenzone + octocrylene + octisalate is one of the most common chemical SPF trios in US drugstore sunscreens — avobenzone for UVA-I, the others for UVB and photostabilization.
What's NOT FDA-Approved: The Modern Filters the US Is Still Waiting For
Since the 1990s, no new sunscreen active ingredients have been approved by the FDA. Eight filters submitted via the Time and Extent Application (TEA) process remain pending — never rejected, never approved. These include what are widely considered the most advanced UV filters currently in use worldwide.
- Tinosorb S (Bemotrizinol): broad-spectrum UVA + UVB, highly photostable; approved in Europe, Canada, Korea, Australia, Japan.
- Tinosorb M (Bisoctrizole): broad-spectrum, photostable, particulate filter; approved everywhere except the US.
- Uvinul A Plus (Diethylamino Hydroxybenzoyl Hexyl Benzoate): UVA filter; widely used in Europe and Korean formulas.
- Uvinul T 150 (Ethylhexyl Triazone): UVB booster; allows higher SPF at lower concentrations.
- Mexoryl XL (Drometrizole Trisiloxane): UVA filter; approved in Canada and Europe; used in La Roche-Posay and Vichy products sold there.
- Parsol SLX (Polysilicone-15): UVB filter available in Europe.
- Amiloxate (Isopentyl-4-methoxycinnamate): UVB filter; used in European formulas.
These filters aren't absent because they're unsafe — they're absent because the FDA's review process has stalled on requests for additional systemic absorption data. The Sunscreen Innovation Act of 2014 was intended to resolve this but has not resulted in any approvals.
How to Choose a US Sunscreen Based on the Active Ingredients
With this knowledge, you can evaluate any US sunscreen label more precisely. For the broadest UVA coverage from a mineral formula, look for zinc oxide as the primary or only active. For a chemical formula, check that avobenzone is present and look for a photostabilizing partner (octocrylene or octisalate). Hybrid formulas that pair a lower concentration of zinc oxide with chemical filters often offer the best balance of UVA coverage and cosmetic feel.
For darker skin tones concerned about white cast, the key questions are: is there zinc oxide, and if so at what percentage? Above about 12-15%, unmodified zinc oxide becomes more visible. Micronized or nano zinc oxide reduces this but may still affect deeper skin tones. Consider tinted formulas where iron oxide provides some visual correction. Chemical-primary or chemical-only formulas will almost always be the most invisible option.
A well-formulated US sunscreen with zinc oxide OR stabilized avobenzone, applied generously and reapplied every 2 hours in sun, provides excellent real-world UV protection.
Frequently asked questions
How many sunscreen filters are FDA-approved?
The FDA currently recognizes approximately 16 UV filter ingredients for use in OTC sunscreens in the US. These include two mineral filters (zinc oxide and titanium dioxide) and a range of chemical filters. Of these, only zinc oxide and titanium dioxide have been formally designated 'GRASE' (generally recognized as safe and effective) in the FDA's 2019 proposed update; the status of the chemical filters is still under review with additional data requests pending.
Is avobenzone safe?
Avobenzone has been used in sunscreens for decades and has an extensive safety record for topical use. The FDA's 2019 study found that it is absorbed into the bloodstream above the agency's threshold for additional testing — but 'more data needed' is not the same as 'unsafe.' Dermatology organizations continue to recommend avobenzone-containing sunscreens as appropriate for daily use. If you prefer to avoid it, zinc oxide-only or titanium dioxide-based mineral sunscreens are your best US alternative.
What is the difference between zinc oxide and titanium dioxide?
Both are mineral UV filters, but zinc oxide covers a wider UV range, including long-wave UVA-I (340-400nm). Titanium dioxide provides strong UVB and shorter-wave UVA-II protection but doesn't extend as far into UVA-I territory. For the most complete UVA coverage in a mineral sunscreen, zinc oxide is the better choice — either alone or combined with titanium dioxide.
Why is oxybenzone controversial in the US?
Oxybenzone is effective and has a long safety record for topical use, but it's been controversial for two reasons: the FDA's 2019 study found systemic absorption above its threshold, prompting requests for additional safety data; and studies have found it can be harmful to coral reef ecosystems, leading Hawaii, Key West, Palau, and other jurisdictions to restrict reef-zone use. It remains an FDA-approved ingredient; the environmental concern is separate from human safety.
What sunscreen filters are approved in Europe but not the US?
Europe has approved several modern filters not available in the US, including Tinosorb S (Bemotrizinol), Tinosorb M (Bisoctrizole), Uvinul A Plus, Uvinul T 150, Mexoryl XL, and others. These were submitted to the FDA in the late 1990s but remain unapproved due to ongoing requests for additional safety data. They are considered effective and safe by regulators in Europe, Canada, Australia, Japan, and Korea.