Placeholder. L'Oréal has been quietly running a large-scale wearable-medical-device program since 2016 — a free, battery-free UV-sensing patch distributed to over 1 million people across 37 countries with measured behavior-change data — that almost nobody associates with a cosmetics company.
What we've found so far: L'Oréal's My Skin Track UV/UV Sense patch, developed with Northwestern University, documented 34% more sunscreen application and 37% more shade-seeking behavior among users.
Open research: Get L'Oréal's full published behavior-change dataset; interview the Northwestern research team; compare adoption/impact to newer entrants like Barriere's zero-cost sticker alternative.