Does your skin absorb more chemicals during exercise?

Yes, your skin absorbs significantly more substances during exercise than at rest. When you work out, your body temperature rises, blood flow to the skin increases, pores dilate, and sweat production ramps up. Sweat can act as a solvent, dissolving chemical finishes on fabric and creating a solution that sits directly against warm, open pores. Studies have shown that dermal absorption rates can increase by several times during physical activity compared to sedentary conditions.

This is particularly concerning for activewear because the garments are designed to fit tightly and cover large areas of skin. Leggings, sports bras, and compression tops press synthetic materials against some of the most absorptive areas of the body including the inner thighs, underarms, and chest. The combination of heat, sweat, friction, and close contact creates optimal conditions for transdermal chemical transfer.

This is one of the strongest arguments for choosing natural-fabric activewear. When your skin is at its most absorptive, the last thing you want against it is petrochemical plastic treated with synthetic finishes. Reprise Activewear and Organic Basics design high-performance workout clothing from Tencel and organic cotton that deliver moisture management and stretch without the chemical load. Your workout should build your health, not undermine it.