A process is described for preparing metal hydroxides, hydroxyl organometals an white carbon. The purity and biocompatibility of the thus obtained substances is such that they can be used for several applications, while being particularly suitable for use in Ayurvedic medicine. Specifically, this process involves an initial step of electrolysis followed by at leas five cycles of microwave irradiation with increasing intensity. Preferably, the process also includes a step of recovering the gases that are released in order to increase the yield of the final product.