Knowing what ingredients to avoid in sunscreen is one of the smartest moves you can make for your skin, your health, and the environment.
Some of the most common chemicals found in everyday sunscreen formulas have been flagged by dermatologists, environmental scientists, and the FDA as potentially harmful, and the more you understand what is actually in your bottle, the better decisions you can make at the checkout.
Key Takeaways
- Oxybenzone and octinoxate are two of the most widely studied harmful sunscreen ingredients and are banned in several destinations, including Hawaii.
- Chemical sunscreen filters absorb UV rays through a skin-penetrating process, while mineral sunscreens sit on top of the skin and reflect UV rays.
- Ingredients like homosalate, octisalate, and avobenzone may disrupt hormones and have raised concerns among scientists and regulators.
- Synthetic fragrances and parabens in sunscreen can trigger allergic reactions and carry their own health risks.
- Mineral sunscreens formulated with non-nano zinc oxide are widely considered the safest and most reef-friendly option available.
- Always check ingredient labels, not just SPF ratings, before choosing a sunscreen.
Why the Ingredients in Your Sunscreen Actually Matter
Most people pick up a sunscreen based on SPF number, brand familiarity, or price. Very few flip the bottle over and read the ingredient list. That habit, or lack of one, has real consequences.
The skin is not a perfect barrier. Research published in JAMA found that certain sunscreen ingredients are absorbed into the bloodstream after topical application. This does not mean they are dangerous, but it shows that what you put on your skin can enter your body.
Beyond personal health, sunscreen chemicals can wash off into the ocean, affecting coral reefs and marine ecosystems. Hawaii banned the sale of sunscreens containing oxybenzone and octinoxate in 2021 over coral bleaching concerns, with other destinations following suit.
Understanding what makes a sunscreen formula potentially toxic is not about fear. It is about making informed choices that protect both you and the environment.
The Worst Offenders: Chemical Filters You Should Avoid
Oxybenzone
Oxybenzone is one of the most controversial sunscreen ingredients. It is readily absorbed through the skin and has been detected in blood, urine, and breast milk. Environmental Working Group also cites evidence suggesting it may disrupt hormone function.
For coral reefs, oxybenzone is particularly damaging. Even at very low concentrations, it has been shown to contribute to coral bleaching and to inhibit the growth of young corals. This is a major reason why Hawaii banned it outright.
If you are currently using a mainstream chemical sunscreen and checking the label, oxybenzone is often listed near the top of the active ingredients. That is a sign to switch.
Octinoxate
Octinoxate, also called octyl methoxycinnamate, is another common UV filter that shares Hawaii's banned substances list with oxybenzone. Like oxybenzone, it has been shown in studies to penetrate the skin, enter the bloodstream, and exhibit hormone-disrupting behavior in lab settings.
It is also harmful to marine life. Research published in scientific literature has linked octinoxate exposure to coral stress responses and damage to aquatic organisms.
Homosalate
Homosalate is a less-talked-about but equally problematic ingredient. It is used as a UV filter and also acts as a penetration enhancer, which means it can actually help other chemicals absorb more deeply into your skin.
The European Commission's Scientific Committee on Consumer Safety has raised concerns about its safety at higher concentrations, and the FDA has not yet confirmed it as safe for use under its own review standards.
Octisalate
Octisalate (also known as octyl salicylate) is frequently used in combination with other chemical UV filters. While some formulas market it as a gentler option, octisalate safety remains under scientific scrutiny.
It can be absorbed through the skin into the bloodstream and is found in many mainstream sunscreens. If you are looking at what to avoid in sunscreen, octisalate belongs on your watchlist, particularly if you have sensitive skin or are applying sunscreen to children.
Avobenzone
Avobenzone is one of the only FDA-approved ingredients that covers UVA rays in chemical sunscreens, but it comes with trade-offs. It is chemically unstable when exposed to sunlight, which is why formulators often pair it with octocrylene or other stabilizers.
Octocrylene itself has been found to degrade into benzophenone, a compound that the FDA has flagged as a potential carcinogen. That chain reaction in the bottle and on your skin is something most consumers never consider.
Other Harmful Additives That Deserve Attention
UV filters are not the only ingredients worth scrutinizing. The inactive ingredients in a sunscreen formula can be just as problematic.
Parabens
Parabens are preservatives found in some sunscreens and other personal care products. They can mimic estrogen in the body and have been detected in breast tissue in some studies. While their risks remain under review, many health-conscious consumers and brands have moved away from them.
Synthetic Fragrances
“Fragrance” on an ingredient label can represent dozens of undisclosed chemicals. U.S. law doesn’t require brands to list each component, which may expose your skin to allergens or irritants. Fragrance-free formulas are often a better choice, especially for children and sensitive skin.
Retinyl Palmitate
Retinyl palmitate is a form of vitamin A sometimes added to sunscreens as an antioxidant. The concern is that UV exposure may cause it to generate compounds that could contribute to skin damage. The Environmental Working Group recommends avoiding it in sunscreens used in direct sunlight.
Chemical Sunscreen and the Mineral Alternative
The difference between chemical and mineral sunscreens is fundamental. Chemical filters absorb UV radiation and convert it into heat, while mineral filters like zinc oxide and titanium dioxide sit on the skin’s surface and help block UV rays before they penetrate.
Understanding the debate between mineral vs chemical sunscreen is key to making a smarter choice. Mineral formulas, especially those using non-nano zinc oxide, aren’t absorbed into the bloodstream like some chemical filters and don’t carry the same reef-damage concerns.
What the FDA Says About Chemical Sunscreen Safety
In 2019 and 2021, the FDA proposed updated sunscreen regulations, concluding that only zinc oxide and titanium dioxide were generally recognized as safe and effective (GRASE).
Major chemical filters, including oxybenzone, octinoxate, homosalate, octisalate, avobenzone, and octocrylene, were classified as “not GRASE” or lacking sufficient data pending further review.
This is not the FDA declaring these ingredients unsafe. It is the FDA saying there is not enough evidence to confirm they are safe. That distinction matters.
For a product applied daily to large portions of the body, sometimes from childhood onward, the bar for safety confirmation should be high. You can read more about how sunscreen is regulated on the FDA's official sunscreen page.
How to Read a Sunscreen Label Without Getting Overwhelmed
Reading ingredient lists does not have to feel like a chemistry exam. Here is a practical approach:
- Look at the active ingredients section first. If you see oxybenzone, octinoxate, homosalate, or avobenzone, that is a chemical sunscreen with known concerns.
- Zinc oxide and titanium dioxide as active ingredients signal a mineral formula.
- Scan the inactive ingredients for "fragrance," parabens (methylparaben, propylparaben, butylparaben), or retinyl palmitate.
- Shorter ingredient lists are generally a good sign. Fewer ingredients mean fewer potential irritants and unknowns.
- "Reef safe" claims on the label are not federally regulated, so always verify the actual active ingredients yourself. Choosing certified reef safe sunscreens with transparent ingredient lists is the most reliable approach.
What Project Reef Gets Right
Project Reef believes sun protection shouldn’t come at a cost to your health or the ocean. Based in Hawaii, the brand uses mineral-based active ingredients and formulates without oxybenzone, octinoxate, or other flagged chemical UV filters, prioritizing skin safety and environmental responsibility.
The reef safe sunscreen spf 50 is a strong example of what a clean mineral sunscreen looks like in practice. It uses non-nano zinc oxide as the sole active ingredient, offers broad-spectrum SPF 50 protection, and is free from the problematic chemicals covered throughout this article.
For days when you need extra comfort and hydration alongside your sun protection routine, the cooling lotion from Project Reef provides skin relief without the harmful additives commonly found in mainstream after-sun products.
If you have questions about formulations or need help finding the right product for your skin type, contact our team today. Project Reef prioritizes transparency, so you know exactly what’s in each formula. In an industry where “reef safe” and “natural” can be loosely used, that accountability matters.
The Bottom Line on What Ingredients to Avoid in Sunscreen
Knowing what ingredients to avoid in sunscreen puts you in control of a decision you make every day. Ingredients like oxybenzone, octinoxate, homosalate, octisalate, and avobenzone have raised concerns, making a mineral sunscreen a simple alternative.
You do not need to be a chemist to make a better choice. You just need to know what to look for on the label and which brands are genuinely committed to clean formulas.
Project Reef makes that choice easy. Start by exploring the full range of mineral sun care products at Project Reef and find a formula that works for your skin, your lifestyle, and the planet.
Things to Know
- The term "reef safe" is not regulated by any U.S. federal agency, meaning a brand can print it on the label even if the formula contains oxybenzone or other harmful chemicals. Always read the active ingredients list yourself.
- Sunscreen chemicals can accumulate in the body over time. The FDA's own research found that oxybenzone reached blood concentration levels far above the threshold that triggers a full safety investigation after just four days of normal use.
- Children's skin absorbs chemicals at a higher rate than adult skin, which makes ingredient selection even more critical when applying sunscreen to kids. Mineral-only formulas are the recommended choice for young children.
- Spray sunscreens often contain additional chemical carriers and propellants that raise their own inhalation risks. If you use a spray formula, apply it carefully and never spray it directly onto a child's face.
- Waterproof sunscreen is a marketing term, not a scientific one. The FDA does not allow brands to use the word "waterproof." The permitted claim is "water resistant," and even that is only valid for 40 or 80 minutes before reapplication is required.
- Some sunscreens labeled "natural" or "organic" still contain chemical UV filters. The word "organic" in personal care labeling can refer to carbon-containing molecules, which includes many synthetic chemicals, not just plant-based ingredients.
Choose a Sunscreen You Can Actually Trust
You have done the research and you know what to avoid. Now it is time to act on it. Switching to a clean, mineral-based sunscreen is one of the simplest ways to protect your skin every single day without exposing yourself or the ocean to unnecessary chemicals.
Project Reef has made that switch as easy as possible. Every formula is built around non-nano zinc oxide, free from oxybenzone, octinoxate, parabens, and synthetic fragrances, and designed for real-world use in the sun, sand, and surf.
Browse the full collection of reef-safe mineral sunscreens and find the formula that fits your skin and your lifestyle.
Frequently Asked Questions
Q: Is oxybenzone actually bad for you, or is the concern overstated?
The concern around oxybenzone is well-founded and backed by FDA research, not just environmental advocacy. The FDA found that oxybenzone absorbed into the bloodstream at levels that exceeded its safety threshold after just four days of regular application.
It has also been flagged as a potential hormone disruptor in multiple studies. While no study has definitively proven it causes harm in humans at typical use levels, the precautionary principle applies here, especially given how frequently and broadly sunscreen is applied.
Q: What is the safest sunscreen ingredient available?
Non-nano zinc oxide is widely considered the safest active sunscreen ingredient for both human health and the environment. The FDA has classified zinc oxide as generally recognized as safe and effective, making it one of only two ingredients to receive that designation.
It sits on top of the skin rather than absorbing into the bloodstream, provides broad-spectrum UVA and UVB protection, and does not degrade in sunlight the way chemical filters do. Titanium dioxide is also classified as safe, though it offers slightly narrower UV coverage than zinc oxide.
Q: Are there sunscreen ingredients that cause cancer?
No sunscreen ingredient has been definitively proven to cause cancer in humans, but some raise enough concern to warrant caution. Octocrylene, for example, can degrade into benzophenone, which has been flagged as a potential carcinogen.
Retinyl palmitate has also raised concerns about skin damage when exposed to UV light. For those seeking to minimize uncertainty, mineral-only formulas are a straightforward option.
Q: How do I know if a sunscreen is truly reef safe?
A genuinely reef-safe sunscreen uses zinc oxide or titanium dioxide as its only active ingredients and contains no oxybenzone or octinoxate. Since “reef safe” isn’t federally regulated in the U.S., the claim can appear on products that still contain chemical UV filters.
The only reliable way to verify a sunscreen's reef safety is to read the ingredient list directly. Look for non-nano zinc oxide or non-nano titanium dioxide as the active ingredient, and avoid any formula listing oxybenzone, octinoxate, homosalate, or octocrylene.
Q: Is it safe to use chemical sunscreen every day?
Daily use of chemical sunscreen raises valid questions about cumulative absorption that have not yet been fully answered by regulators. The FDA's 2021 proposed rule noted that there is not enough data to confirm most chemical UV filters are safe for daily, long-term use.
For occasional outdoor activities, the skin cancer protection benefits likely outweigh unknown risks for most adults. For daily use, especially on children, many dermatologists and health-conscious consumers prefer mineral sunscreens as a more conservative choice.
