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Description: An immunomodulator is any substance that helps to regulate the immune system. This "regulation" is a normalisation process, so that an immunomodulator helps to optimise immune response. Give an immunomodulator to someone with a low immune system, and it can help raise that immunity; give a modulator to someone with a healthy immune system, and it will have little effect in the body; and give a modulator to someone with an overactive immune system, and can help to normalize that overactive immune system.