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Yes. Studies found several sunscreen active ingredients in participants’ blood after application, including under intensive, maximal-use conditions. That finding prompted a need for more safety data; it does not show that sunscreen caused harm or that the measured levels are toxic. The FDA continues to recommend sun protection, including sunscreen.
What the sunscreen absorption studies found
Two randomized trials measured sunscreen ingredients in plasma, the liquid component of blood. Both used specified commercial formulations and application protocols, so their findings describe those study conditions—not every sunscreen or every real-world pattern of use.
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The 2019 trial: four active ingredients
A randomized trial of 24 healthy volunteers tested four marketed sunscreen formulations under maximal-use conditions, including reapplication at two-hour intervals. Researchers measured avobenzone, oxybenzone, octocrylene and ecamsule in participants’ plasma. The concentrations exceeded the FDA guidance threshold relevant to whether certain nonclinical safety studies could be waived. The study measured systemic exposure, not illness or another clinical harm outcome. Read the 2019 trial in JAMA.
The 2020 trial: six active ingredients
A second randomized study involved 48 healthy participants and tested avobenzone, oxybenzone, octocrylene, homosalate, octisalate and octinoxate across four formulations. It assessed both single-use and maximal-use conditions. All six ingredients were systemically absorbed, and plasma concentrations surpassed the FDA threshold cited by the researchers. Those results do not establish that every product containing an ingredient produces the same exposure. Read the 2020 trial in JAMA.
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| Study | Participants | Ingredients measured | Conditions and finding |
|---|---|---|---|
| 2019 randomized trial | 24 healthy volunteers | Avobenzone, oxybenzone, octocrylene, ecamsule | Four marketed formulations under maximal-use conditions; measured plasma concentrations exceeded the FDA safety-testing threshold. |
| 2020 randomized trial | 48 healthy participants | Avobenzone, oxybenzone, octocrylene, homosalate, octisalate, octinoxate | Four formulations under single- and maximal-use conditions; all six ingredients were absorbed, with concentrations above the cited threshold. |
In both trials, the measured outcome was absorption into systemic circulation. Neither result, by itself, demonstrates that an ingredient causes disease or other harm.
What the FDA’s 0.5 ng/mL threshold means
The FDA’s 0.5 nanograms per milliliter (ng/mL) figure is a threshold in safety-testing guidance. In this context, a concentration above it indicates that additional safety data may be needed before certain nonclinical studies can be waived. It is a regulatory testing trigger—not a toxicity limit, a safe-versus-dangerous dividing line, or proof that a product has caused harm. See the FDA guidance on maximal usage trials.
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The studies’ authors described the limits of what their findings establish. The 2019 trial concluded: “The systemic absorption of sunscreen ingredients supports the need for further studies to determine the clinical significance of these findings.”
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Absorption alone is not a reason to stop using sunscreen. FDA consumer guidance acknowledges that some active ingredients can pass through the skin into the body while continuing to recommend sun-protection measures, including sunscreen. Use sunscreen as part of a broader approach to limiting sun exposure. Read the FDA’s sunscreen guidance.
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- HAWAII COMPLIANT & TRAVEL READY: This formula is Hawaii Act 104 compliant, meaning it's made without oxybenzone and octinoxate, making it an ideal choice for beach vacations and daily wear.
- COMPLEMENT YOUR GLP-1 ROUTINE: As more walking, outdoor workouts, or time outside become part of your routine, this mineral SPF lotion makes everyday sun protection simple and comfortable.
These absorption trials do not establish that mineral sunscreen, or any particular brand or formula, is safer. They address systemic exposure under the tested conditions; they do not provide a basis for ranking all sunscreen products by safety.
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- SPF 50 BROAD SPECTRUM PROTECTION - The water-resistant sunscreen formula provides broad spectrum protection and helps protect skin from up to 98% of UVB rays
- FORMULATED FOR SENSITIVE SKIN - Developed specifically for sensitive skin, this SPF 50 body sunscreen has a hypoallergenic formula that is also paraben-free and fragrance-free
- INFUSED WITH ORGANIC ALOE VERA - This SPF 50 mineral sunscreen with zinc oxide and titanium dioxide gently soothes and moisturizes
- TRUSTED BY DERMATOLOGISTS - Perfect for the whole family, Blue Lizard has been trusted by dermatologists for over 20 years.
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