The colorants used in MeLuna USA menstrual cups is one of the main differences between the US version that is FDA cleared and the European version of MeLuna cups.The colorants used in the US version are not food colorants but rather high-end colorants specifically engineered to be used in medical devices. They have been extensively tested to be safe for applications including contact with mucosal tissue like in the vagina.For cup users wanting to completely avoid any type of colorants MeLuna also is available in clear/ colorant-free