A supplementary therapeutic agent for the treatment of immunodeficiency syndrome with reduced NK (natural killer) activity and an immunopotentiator preparation containing it are provided.A supplementary therapeutic agent for immunopotentiation which comprises L-cysteine, L-cystine, or L-glutamine, or salts thereof and is used in combination with an immunopotentiator such as lentinan, OK-432, sizofiran or the like, and an immunopotentiator preparation containing the agent. This combination of agents is useful as a supplementary therapeutic agent for the treatment of an immunodeficiency, such as low NK activity syndrome, chronic fatigue syndrome, acquired immunodeficiency syndrome, or congenital immunodeficiency syndromes.

l cystine/fatigue

Supplementary therpeutic agents for the treatment of immunodeficiency syndrome

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