By Vijay Kumar Malesu Reviewed by Susha Cheriyedath, M.Sc. Apr 28 2026 A flexible skin patch detected trace vitamins in sweat and tracked changes in vitamin B9 after food and supplements, offering an early glimpse of non-invasive, personalized nutrition monitoring. Study: Real-time nanomolar vitamin monitoring in sweat using an electrochemical skin-attached device . Image Credit: Image generated with AI  In a recent study published in the journal  Nature Communications , a group of researchers