Researchers Develop Wearable Sensor to Monitor Vitamin Levels Through Sweat

Your sweat could soon double as a real-time nutrition report. In a breakthrough study published in Nature Communications, researchers have developed a wearable device that can track multiple vitamins through sweat—offering a non-invasive way to monitor nutritional health.

Globally, more than 2 billion people experience “hidden hunger,” where calorie intake is sufficient but essential micronutrients are lacking. Traditional blood tests, while accurate, are invasive and impractical for frequent monitoring. This new wearable aims to change that by turning sweat into a continuous source of nutritional data.

The device consists of a flexible skin patch paired with a reusable electronic module. Using advanced electrochemical sensors enhanced with nanomaterials, it can detect extremely low concentrations of key vitamins, including B1, B2, B7, B9 (folate), B12, and vitamin D. Sweat is gently stimulated using a mild electrical current and analyzed in real time, with data transmitted wirelessly to a smartphone.

In human testing, the system successfully tracked changes in vitamin B9 levels after food and supplement intake. After a single dose of folic acid, sweat levels rose more than threefold within hours. Importantly, these readings closely matched blood measurements, showing strong correlation and reliability.

The device also revealed lifestyle-linked differences. For instance, smokers showed lower vitamin B9 levels compared to non-smokers, highlighting its potential for identifying at-risk groups and guiding targeted interventions.

What makes this technology stand out is its ability to deliver continuous, personalized insights. Instead of relying on occasional lab tests, individuals could monitor how diet, supplements, or habits affect their nutrient levels in real time.

By making vitamin tracking easier and more accessible, this innovation could reshape how we manage diet and health—shifting the focus from reactive care to proactive, data-driven wellness.

REFERENCE: Wang, X., Wang, Y., Li, Y., Sun, Y., Mao, P., Liu, S., Ou, J., Wang, X., Ren, F., & Zhang, H. (2026). Real-time nanomolar vitamin monitoring in sweat using an electrochemical skin-attached device. Nature Communications. DOI: 10.1038/s41467-026-72356-1, https://www.nature.com/articles/s41467-026-72356-1