Abstract: The present invention relates to the field of human and veterinary medicine. The invention solves the problem associated with the lack of an agent for improving the immune response in immunosuppressed individuals, or with autoimmunity problems as well as infections; reducing the effects of the stress, combating tissue fibrosis; the need for anti-inflammatory agents; treatments for acute and chronic hepatitis, treatments against malignant processes and metastasis, as well as thrombocytopenia, both in humans and animals. The present invention comprises a molecular complex formed by a metallic ion and a peptide as novel compound, which is denominated as an immunomodulator metallopeptide hereafter abbreviated as IMMP. Claims also include the process for obtaining the complex, the use of the metallopeptide for producing a therapeutic or nutraceutic agent, and the use of that agent in humans and animals.