Is Titanium Dioxide Safe in Sunscreen? How Well It Protects, Explained

Titanium dioxide is considered safe in sunscreen. The FDA has proposed it as safe and effective at up to 25%, and reviews find almost no absorption through intact skin. It protects well against UVB but less well against long UVA1 rays, which is why it is usually paired with zinc oxide. The real caution is breathing it in from sprays.

Below we look at the safety evidence, how its UVA coverage compares with zinc oxide, why Europe banned it as a food additive but not in sunscreen, what to know about sprays and powders, and how it shows up in makeup.

Is titanium dioxide safe in sunscreen?

Yes. Titanium dioxide is one of only two long-standing US sunscreen filters the FDA has proposed as generally recognized as safe and effective (GRASE). The agency says it found sufficient safety data on both zinc oxide and titanium dioxide to support that proposal, at concentrations up to 25%. The other filter is zinc oxide; for 12 chemical filters, the FDA asked for more data.

The research behind that view centers on absorption. A 2019 review of mineral filters concluded that human health risks are extremely low given a lack of percutaneous absorption. An earlier review found that sunscreen nanoparticles are incorporated into the stratum corneum, the outer layer of dead cells, and only sporadically seen deeper.

That earlier review also raised a lab-based point worth knowing. Titanium dioxide can produce free radicals when it absorbs UV, an effect that is strongest in the anatase crystal form. Coatings reduce it, and silica-based coatings are the most effective. This is a reason formulators coat the particles. Neither review treats it as a reason to avoid mineral sunscreen, and the AAD's position is that the science doesn't show that any sunscreen ingredients currently available in the US are harmful to human health.

How well does titanium dioxide protect against UVA?

Titanium dioxide protects strongly against UVB and the shorter UVA2 band, but it falls off in long-wave UVA1, above about 360 nm. A 2019 review sums it up: zinc oxide has a broad UVA-UVB curve, while titanium dioxide provides better UVB protection.

A head-to-head lab and skin study makes the gap concrete. Formulas with 3% avobenzone or 5% zinc oxide blocked UVA above 360 nm better than a formula with 5% titanium dioxide. Adding photostabilized avobenzone or zinc to a product raised its UVA protection factor nearly threefold, while adding titanium dioxide raised it only modestly. The authors concluded that titanium dioxide cannot be considered a substitute for avobenzone or zinc oxide when high UVA protection is the goal.

Particle size shifts the picture further. Making the particles smaller increases UVB absorption at the expense of UVA1 absorption, and that same review notes that titanium dioxide absorbs more in the UVB range while zinc oxide absorbs more UVA1.

In practice, check that a titanium dioxide sunscreen says "broad spectrum," which the FDA describes as protection against both UVA and UVB, and look for zinc oxide or avobenzone alongside it in the active ingredients.

Titanium dioxide vs zinc oxide: which is better?

Zinc oxide is the better all-rounder for UVA, and titanium dioxide is the stronger UVB filter. Using both gives broad coverage with less of either. The review cited above states that because titanium dioxide is more effective in UVB and zinc oxide in UVA, combining them gives broad-band protection.

The white-cast row comes from a study that found zinc oxide less white than titanium dioxide at a given concentration. For more on zinc, read our zinc oxide sunscreen guide.

You'll see both approaches on US labels. La Roche-Posay Anthelios Tinted Mineral Light Fluid SPF 40 lists titanium dioxide 17% with zinc oxide 8%. ISDIN Eryfotona Actinica Tinted SPF 50 lists titanium dioxide 16.1% as its only active, while the untinted version of the same line uses zinc oxide 11%.

Why was titanium dioxide banned in food but not in sunscreen?

The food ban is about swallowing particles, and its conclusion does not carry over to sunscreen. In May 2021 the European Food Safety Authority concluded that titanium dioxide, food additive E171, can no longer be considered safe as a food additive. The main reason was genotoxicity: EFSA could not rule out that ingested particles damage DNA, so it could not set a safe daily intake.

EFSA was explicit about the scope: its evaluation relates to titanium dioxide used as a food additive, not to other uses. Eating particles every day and spreading them on skin, where they stay in the outer layer, are different exposures. The FDA's proposed GRASE status for sunscreen came after its own safety review.

Is titanium dioxide in spray sunscreen or powder dangerous to inhale?

Inhalation is the one route where caution is clearly warranted. When the International Agency for Research on Cancer reviewed titanium dioxide in its Monographs Volume 93, it did so because evidence suggests poorly soluble particles like it cause cancer in the respiratory tract of rats when inhaled. The 2019 mineral filter review likewise notes a potential risk when exposed via inhalation, which has led to recommendations against nanoparticle spray sunscreens.

The EU's Scientific Committee on Consumer Safety (SCCS) looked at specific products in 2020. It found pigmentary titanium dioxide at up to 25% not safe in hair-styling aerosol sprays, but safe at up to 25% in loose face powder for consumers. It noted its conclusions rest on a narrow set of products and one type of titanium dioxide.

What to do with that:

• Use lotions, creams, fluids or sticks on your face.
• If you use a spray on your body, follow the AAD's advice to never spray near the face or mouth and not into the wind. Spray into your hands outdoors and rub it in.
• Loose powders with titanium dioxide are fine per the SCCS, but tap off the excess and avoid creating a cloud.

Does titanium dioxide in makeup protect you from the sun?

Titanium dioxide in foundation and powder adds some UV protection, but most people apply far too little makeup to get the SPF on the label. Many cosmetics use titanium dioxide as a white pigment, so seeing it in the ingredient list doesn't tell you how much sun protection you're getting. Look for a labeled, broad-spectrum SPF instead.

Even when makeup has a tested SPF, the number assumes a generous layer. The AAD recommends at least a teaspoon of sunscreen for the face, which is far more foundation than anyone wears. Treat SPF makeup as a top-up and wear a real sunscreen underneath. Tinted products with iron oxides help in another way: the AAD notes that tinted sunscreens add protection against visible light, which can worsen dark spots, especially on darker skin. For layering, see skincare before makeup, and for amounts, how much sunscreen to use.

Who should choose a titanium dioxide sunscreen?

A titanium dioxide or titanium-zinc sunscreen suits people who react to chemical filters and want a mineral option, especially in a tinted formula. The AAD says dermatologists recommend mineral sunscreens for people with sensitive skin. Its rosacea guidance adds that mineral sunscreens can leave a white cast, especially on darker skin, and suggests a micronized or tinted mineral sunscreen instead.

• Sensitive or rosacea-prone skin: a fragrance-free mineral formula. Our picks are in the best mineral sunscreens for sensitive skin.
• Medium to deep skin: a tinted titanium-zinc fluid in a matched shade.
• Melasma or dark marks: the AAD's melasma guidance points to sunscreens with zinc oxide, titanium dioxide and iron oxide. See a dermatologist if patches keep returning.
• Long outdoor days: check for "broad spectrum" plus zinc oxide or avobenzone in the actives, so long UVA is covered.

Reapply at least every two hours outdoors, as the FDA advises, and right after swimming or sweating.

How can a selfie scan or ingredient scanner help?

A mineral sunscreen only helps if you like wearing it, and its effect on spots and tone shows over months. An app like Pori scores a selfie from 0 to 100 with a Pigmentation & Tone breakdown, so you can track changes in a consistent way. Pori Pro's ingredient scanner reads a barcode or a label photo and flags each listed ingredient as beneficial, use with caution or avoid for your skin type, which is handy for spotting fragrance or heavy oils in a new tinted sunscreen.

An app is not a diagnosis. See a dermatologist for rashes, reactions or any spot that changes.