The active ingredients of commonly used sunscreens end up in the bloodstream at much higher levels than current U.S. guidelines from health regulators and warrant further safety studies, according to a small study conducted by U.S. Food and Drug Administration researchers and published on Monday.
For example, the maximum concentration of avobenzone was found to be 4 ng/mL and 3.4 ng/mL for two different sprays, 4.3 ng/mL for a lotion and 1.8 ng/mL for the cream.The effects of plasma concentrations exceeding the FDA's limit is not known and needs to be further studied, the research team wrote in the Journal of the American Medical Association .
"The study findings raise many important questions about sunscreen and the process by which the sunscreen industry, clinicians, specialty organizations, and regulatory agencies evaluate the benefits and risks of this topical OTC medication," they added.
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