Sunscreen Ingredients to Avoid, and the Ones Dermatologists Trust

Headlines about sunscreen chemicals in the bloodstream, hormone disruption, benzene recalls and reef bans have left many people unsure what is safe to put on their skin, or whether to use sunscreen at all. The facts are more reassuring than the headlines, and more nuanced than “chemical bad, mineral good.”

Here is what the FDA has actually said about each sunscreen ingredient, which concerns are real, which are unproven, and how to choose a sunscreen you will wear every day. The one thing the evidence is clear on: the proven risk of skin cancer and sun damage from going without sunscreen is far greater than any unproven risk from its ingredients.

How the FDA rates sunscreen ingredients

In the US, sunscreens are regulated as over-the-counter drugs. In 2019 the FDA proposed sorting the active ingredients into three groups. The groups describe how much safety data exists, not proof of harm: the FDA has said that needing more data does not mean an ingredient is unsafe.

Ingredient	FDA status	What it means
Zinc oxide, titanium dioxide	Proposed safe and effective (GRASE)	Enough data; the mineral filters
Bemotrizinol	Added as safe and effective, up to 6% (June 2026)	A newer broad-spectrum filter long used outside the US
Oxybenzone, avobenzone, octinoxate, octisalate, octocrylene, homosalate and 6 others	Need more data	Still allowed; manufacturers asked for absorption and safety studies
PABA, trolamine salicylate	Proposed not safe and effective	Rarely used in sunscreens today

Do sunscreen chemicals get into your blood?

Yes, some do. In an FDA-led study published in JAMA in 2020, 48 adults applied sunscreen to most of their body several times a day. After a single application, blood levels of avobenzone, oxybenzone, octocrylene, homosalate, octisalate and octinoxate all went above 0.5 ng/mL, the level at which the FDA asks for further safety testing. That threshold is a trigger for more research, not a danger line. The researchers and the FDA stressed that absorption does not mean the ingredients are unsafe, and that people should keep using sunscreen.

The ingredients people worry about, one by one

Oxybenzone (benzophenone-3)

The most debated filter. It is absorbed through the skin more than most, it is a known cause of allergic and sun-triggered allergic rashes, and high-dose animal and lab studies suggest it can act on hormones. Effects on hormones in people using sunscreen normally have not been proven. Hawaii banned the sale of sunscreens containing oxybenzone and octinoxate from 2021 over reef concerns, and many brands have dropped it. If you are pregnant, have sensitive skin or simply prefer to avoid it, it is easy to find oxybenzone-free sunscreens.

Octinoxate and homosalate

Both are absorbed through the skin and have the same “more data needed” status. Some lab studies raise hormone questions, but there is no evidence of harm from normal use. Avoid them if you would rather not take the chance; there is no need to throw away a sunscreen you already have.

Avobenzone

One of the few chemical filters that protects well against UVA, the rays that age skin. It is permitted at up to 3%. On its own it breaks down in sunlight, so it is combined with stabilizing ingredients. It is not considered unsafe; it simply needs a well-made formula.

Octocrylene

Used to stabilize avobenzone. It can cause allergic reactions, especially in children and people sensitized to certain anti-inflammatory gels. A 2021 study found that octocrylene can slowly break down into benzophenone in older products, and benzophenone is classed as a possible carcinogen. There is no evidence that octocrylene sunscreen causes melanoma. Do not use sunscreen past its expiry date.

Benzene (a contaminant, not an ingredient)

Benzene is never added to sunscreen. In 2021 an independent lab found benzene in 27% of 294 batches of sunscreen and after-sun products, in both mineral and chemical formulas, some above the FDA’s limit of 2 parts per million. Several aerosol sprays were recalled. This was a manufacturing contamination problem with particular batches, not a reason to avoid sunscreen. Check the FDA recall list if you are unsure about a product.

Fragrance

Fragrance is one of the most common causes of allergic skin reactions. It adds nothing to protection. If you have sensitive skin, eczema or rosacea, choose a fragrance-free sunscreen. “Unscented” is not the same thing and may contain masking fragrance.

Nanoparticles and sprays

Mineral sunscreens often use very small (nano) zinc oxide or titanium dioxide particles so they rub in without a white cast. On healthy skin these particles stay in the outer, dead layer and are not considered a risk. The bigger concern is breathing in sprays, especially for children, so rub sprays into your hands before applying to the face, spray in open air, and prefer lotions or sticks for kids.

Mineral or chemical sunscreen?

Both types absorb UV light (mineral filters also reflect a little), and both protect well when you use enough. Many dermatologists favor mineral formulas for sensitive skin and for anyone who wants to avoid the open safety questions, but the best sunscreen is the one you will apply generously and reapply.

What about coral reefs?

Lab studies show some UV filters, especially oxybenzone, can harm coral and other marine life at certain concentrations. How much this matters in real oceans, compared with warming water, pollution and runoff, is still unclear. A 2022 National Academies report found too little data to judge the real-world risk and asked the EPA to study it, while confirming that regular use of broad-spectrum, high-SPF sunscreen reduces skin cancer, sunburn and skin aging. If you want to minimize any impact, choose mineral sunscreen and wear a rash guard and hat for long swims.

How to choose a sunscreen

• EveryoneBroad-spectrum, SPF 30 or higher, water-resistant if you swim or sweat.
• Sensitive, eczema or rosacea-prone skinFragrance-free mineral (zinc oxide) sunscreen.
• Pregnant or prefer fewer unknownsMineral sunscreen, or a chemical formula without oxybenzone.
• Babies and childrenKeep babies under 6 months out of the sun; after that, mineral lotions or sticks rather than sprays.
• Melasma or dark spotsTinted mineral sunscreen with iron oxides.
• Acne-prone skinA lightweight formula labeled non-comedogenic.

Whichever you choose, use about a teaspoon for the face and neck and reapply every two hours outdoors. Our summer skincare guide covers how to apply it properly.

Sun protection and skin checks in Carlsbad

Our team can recommend a sunscreen for your skin type, especially after a peel, laser treatment or if you have melasma, and check any spots that worry you. See our skin cancer screening and prescription skincare pages, read about retinol and vitamin C, or book a visit at our South Carlsbad studio on El Camino Real.