Uploaded December 2025 | Updated September 2026, 1 hour ago

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🧪 PT2 Layering is complex! But the results are interesting and relieving that layering these products doesn't necessarily hurt the SPF protection. At the very least this is one piece of data that shows that layering filters shouldn't be negating our total SPF coverage.
🏮 Disclaimer! This can't be generalized to all filter combos and formulations. This only tests a few combos of SPF (not including avobenzone).
(doi: 10.1111/srt.13010)