I have been banging on about FDA delay in approving new sunscreens since 2013. Well it has finally happened. Twenty six years after being approved by the European Union and thirteen years after then-FDA Commissioner Margaret A. Hamburg told lawmakers that sorting out the sunscreen issue was “one of the highest priorities” the FDA has approved a new sunscreeen ingredient.

The US has been slow because it regulates sunscreens under the the more expensive, time consuming and rigorous drug standard rather than the less expensive cosmetic standard. Does this mean that our sunscreens are safer? No.

In fact, American sunscreens may be less safe.

Sunscreens protect by blocking ultraviolet rays from penetrating the skin. Ultraviolet B (UVB) rays, with their shorter wavelength, primarily affect the outer skin layer and are the main cause of sunburn. In contrast, ultraviolet A (UVA) rays have a longer wavelength, penetrate more deeply into the skin and contribute to wrinkling, aging and the development of melanoma, the deadliest form of skin cancer. In many ways, UVA rays are more dangerous than UVB rays because they are more insidious. UVB rays hit when the sun is bright, and because they burn they come with a natural warning. UVA rays, though, can pass through clouds and cause skin cancer without generating obvious skin damage.

The problem is that American sunscreens work better against UVB rays than against the more dangerous UVA rays. That is, they’re better at preventing sunburn than skin cancer. In fact, many U.S. sunscreens would fail European standards for UVA protection. Precisely because European sunscreens can draw on more ingredients, they can protect better against UVA rays. Thus, instead of being safer, U.S. sunscreens may be riskier.

European sunscreens are also more pleasant to apply, and because they work better with makeup they are probably used more often as part of a skin care regimen, which may reduce the prevalence of skin cancer. Once again, the United States’ slower and seemingly more risk-averse approach actually increases risk.

The lesson, for those who are listening, is general.

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