We would never offer a product that we aren't 100% sure are safe for you! Our panties are being tested not once but twice during production by external laboratories for potentially harmful chemicals, and then again after production. They are certified PFAS-free! Our products are also always free of silver nanoparticles, and we only use GOTS-certified organic cotton and OEKO-TEX 100 materials. We also keep them anti-microbial thanks to the layer we use for absorbency inside the underwear: it is a microfiber fabric that contains PHBV/PLA. This fabric naturally fights odors and bacteria. No tricky ingredients added here!