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The patent application relates to a stable free-radical product, used to produce brain excitation in mammals when intravenously administered. The free-radical product is prepared from purified plasma proteins, pituitary peptides and other structures containing tyrosine or tryptophan by oxidation with a free-radical nitrosyl disulfonate product in alkaline solution under controlled conditions. Intravenous administration of the free-radical product into mammals causes a sudden electroencephalographic arousal accompanied by behavioral changes indicative of brain excitation. Illumination of the free-radical product by visible light prior to administration substantially enhances the arousal and brain excitation effects.