Oligoceleste Cu Au Ag (Copper Gold Silver) by Erbenobili is a food supplement based on essential oils and copper, a mineral indicated to contribute to the normal functioning of the nervous system. How to use: It is recommended to take the product under the tongue, keeping it in the mouth for a few minutes, in the morning as soon as you wake up or, in the case of several daily doses, between meals. Warnings Food supplements should not replace a varied and balanced diet or a healthy lifestyle.