Are chemical sunscreens safe?

Does absorption mean chemical sunscreen is harmful?

Absorption is a reason to investigate exposure, not a finding that sunscreen causes harm. Sunscreen does its protective work at the skin's surface, even though some filters pass through the skin. The FDA has requested additional safety data from manufacturers and continues to advise using sunscreen alongside clothing and other sun protection. The practical answer is to keep protecting your skin while those questions are investigated.2

There is no evidence that wearing sunscreen causes skin cancer. Sun exposure damages DNA in skin cells, and that damage can lead to cancer. Regular sunscreen use helps prevent skin cancer. A diagnosis after someone starts wearing sunscreen can reflect damage from years or decades earlier, rather than damage caused by sunscreen.3

Is mineral sunscreen safer?

Mineral sunscreen is less likely to irritate skin, which makes it a useful choice for sensitive skin. That does not make chemical sunscreen an unsafe category. Chemical filters absorb ultraviolet radiation and release it as heat. Mineral filters, zinc oxide and titanium dioxide, also mainly absorb ultraviolet radiation, with some scattering and reflection. Hybrid sunscreens combine both types. All three can provide effective sun protection.14

Sunscreen labels contain both regulated terms and marketing language, which is a lot of editorial freedom for a bottle. Choose broad spectrum protection, which covers UVA and UVB rays, SPF 30 or higher, and water resistance. For extended outdoor activity, choose SPF 50 or higher. The filter category alone does not tell you whether a sunscreen offers those protections.145

What if sunscreen stings or irritates your skin?

If sunscreen stings or burns, switch to a fragrance free sunscreen whose only active filters are zinc oxide and titanium dioxide. For sensitive or allergy prone skin, avoid fragrance, parabens and oxybenzone. If you are prone to acne or have oily skin, look for "noncomedogenic" or "won't clog pores" on the label. These are selection tips, not a promise that a particular bottle will suit your skin.5

How should you use chemical sunscreen?

1. 1Apply sunscreen every day before going outdoors. Follow the label; general application guidance is 15 to 30 minutes before sun exposure.
2. 2Cover all exposed skin generously. About one ounce covers an entire adult body. Remember ears, the back of your neck, your hairline and the tops of your feet.
3. 3Reapply every two hours outdoors and after toweling off. When swimming or sweating, follow the label's 40 or 80 minute water resistance limit.
4. 4Add shade, protective clothing, a hat and sunglasses. No sunscreen blocks all ultraviolet radiation.

For babies younger than six months, use shade and protective clothing rather than routine sunscreen, and ask a doctor before applying it. For older infants and toddlers, zinc oxide or titanium dioxide are less likely to irritate sensitive skin. Certain medications increase sensitivity to sunlight, making sun protection especially important.124

Does "reef safe" mean safer?

"Reef safe" has no FDA definition, so the wording is doing more work than the rulebook. Research on sunscreen ingredients and coral remains limited, with no clear answers. That label is not a shortcut for deciding whether a sunscreen is safer for your skin.4