What are the unknown effects of high sunscreen absorption?

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Unknown Effects of High Sunscreen Absorption Warrant Further Study

A small study conducted by US Food and Drug Administration (FDA) researchers indicates that common sunscreen ingredients can be absorbed into the bloodstream at levels significantly exceeding the FDA's guideline for further safety testing. The study, published in the Journal of the American Medical Association (JAMA), found maximum plasma concentrations of ingredients like avobenzone, oxybenzone, octocrylene, and ecamsule to be well above the 0.5 nanograms per millilitre (ng/mL) threshold. For instance, maximum avobenzone concentrations in blood plasma ranged from 1.8 ng/mL to 4.3 ng/mL, depending on the product formulation tested.
Systemic Absorption Exceeds FDA Safety Threshold

The research involved 23 volunteers who applied sunscreen formulations, including sprays, lotions, and creams, to 75% of their body surface area four times daily for four consecutive days. Blood tests conducted over a seven-day period revealed that the systemic absorption of four key sunscreen chemicals—avobenzone, oxybenzone, octocrylene, and ecamsule—surpassed the FDA's established guideline of 0.5 ng/mL. This guideline is typically used to trigger further safety evaluations for such ingredients.
Unclear Health Implications of Absorbed Chemicals

Crucially, the study's authors noted that the health effects associated with plasma concentrations of these sunscreen ingredients exceeding the FDA's limit remain unknown. The research team emphasized that these findings necessitate further investigation to understand any potential risks. While the results do not suggest discontinuing sunscreen use, they highlight a gap in current knowledge regarding the safety of these absorbed chemicals.
Call for Additional Safety Testing and Evaluation

The study's findings have prompted calls for more comprehensive safety testing of sunscreen ingredients. Experts, including a senior scientist from the Environmental Working Group, have advocated for thorough evaluations, particularly as regulatory bodies like the FDA propose additional testing requirements for these commonly used ingredients to remain on the market. This underscores a broader discussion within the scientific and regulatory communities about balancing the benefits of sun protection against the potential risks of systemically absorbed chemicals.

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What are the unknown effects of high sunscreen absorption?

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