Doped strontium alluminate is not exactly food grade (though it is considered non-toxic), but that's not the orifice these devices are going in. The silicone ma

Doped strontium alluminate is not exactly food grade (though it is considered non-toxic), but that's not the orifice these devices are going in. The silicone matrix retains the vast majority of the pigment, which itself is fairly inert. It has virtually no bioavailability and any of the micrograms of it that might slough off during a session will almost certainly be exuded in short order.