The topic of the present invention is to provide an agent, which has the required effect of an agent for regenerating used cooking oil to reduce the acid value of the used cooking oil, and a method for regenerating the used cooking oil using the agent. The agent of the present invention for reducing the acid value of used cooking oil contains a hydrotalcite compound as an active ingredient, and has a deoxygenation capability to reduce the acid value by 70% or more. Furthermore, it also has a decolorization capability to reduce yellowness caused by degradation by 15%. The hydrotalcite compound is subjected to a sintering treatment at 150-400 DEG C. The hydrotalcite compound is granulized to have an average particle size of 50-200 [mu]m.本發明之課題在於提供:能發揮使用後食用油之再生劑所必要效果的用來減低使用後食用油之酸價的製劑、及使用其之使用後食用油的再生處理方法。本發明用來減低使用後食用油之酸價的製劑,係以水滑石類化合物為有效成分,且具有降低酸價70%以上的脫氧能力。又,具有降低劣化造成之黃色色度15%的脫色能力。水滑石類化合物係依150~400℃施行煅燒處理。水滑石類化合物係造粒為平均粒徑50~200μm。
