Problem to be solved: to provide a method of producing a reducing solution having a large reduction force and a high stability of reduction effect.The method for producing the reducing solution according to the present invention includes at least the step of adding yeast bacteria to carbohydrates. The redox reduction potential 2 of the reducing solution is lower than the redox reduction potential 1 of the sodium reduction solution (concentration 1 mol \/ liter) which is a conventional reducing agent, and it is understood that the reduction effect is high in the state of being dissolved in water, and the reduction force is large.Diagram【課題】還元力が大きく、還元効果の安定性が高い還元液の製法を提供する。【解決手段】本発明に係る還元液の製法は、少なくとも、炭水化物に酵母菌などを加えるステップを含む。この還元液の酸化還元電位2は、従来の還元剤である亜硫酸ナトリウム水溶液(濃度1mol/リットル)の酸化還元電位1より低く、水に溶けた状態で還元効果の安定性が高く、還元力が大きいことが分かる。【選択図】図1
