It is intended to provide a safe composition for treating a disease or condition relating to autonomic nervous activity which has an autonomic nervous control effect； in particular, an effect of enhancing parasympathetic nervous activity. Thus, a medicinal composition, a food or a drink containing L-phenyl lactic acid and/or D-phenyl lactic acid and having an autonomic nervous control effect is provided.本發明之課題，係提供一種安全之組成物，其係具有調節自律神經活動作用、尤其是亢進副交感神經活動作用，而用於處置自律神經活動相關之疾病或狀態。本發明提供一種醫藥組成物或飲食物，係含有L-苯乳酸及/或D-苯乳酸，而具有調節自律神經作用。
