Problem to be solved: to provide a method of evaluating the composition suitable for evaluating whether the inhibition of keratin degeneration or the regeneration to an uneven keratin is promoted, and a method for producing a composition for keratin.Evaluation method of the component isDenaturation (I) to degrade keratin and / or its derivatives in solution (I) andDetermination of the amount (I) of unmodified keratin and its derivatives in solution (I) after this treatment (I) andDenaturation (II) and denaturation of keratin and / or its derivatives in solutionA quantitative treatment (II) that determines the amount (II) of unmodified keratin and its derivatives in solution (II) after this treatment andA comparison (I-II) comparing values based on the amount (I) and values (II) based on the amount (I) andEquipped withA component (I) is mixed into solution (I) between solution (I) or denaturation (I) and quantitative treatment (I) in denaturation (I);Manufacturing method for keratin compositionThe evaluated components are mixed in the composition.No selection【課題】ケラチン変性の抑制、又は、未変性ケラチンへの再生を促進するものであるかの評価に適した成分の評価方法、及び、ケラチン用組成物の製造方法の提供。【解決手段】成分の評価方法は、溶液(I)におけるケラチン及び/又はその誘導体を変性させる変性処理(I)と、この処理後の溶液(I)における未変性のケラチン及びその誘導体の量(I)を定める定量処理(I)と、溶液(II)におけるケラチン及び/又はその誘導体を変性させる変性処理(II)と、この処理後の溶液(II)における未変性のケラチン及びその誘導体の量(II)を定める定量処理(II)と、量(I)に基づく値及び量(II)に基づく値を比較する比較処理(I-II)と、を備え、変性処理(I)における溶液(I)又は変性処理(I)と定量処理(I)の間の溶液(I)に被験成分(I)を配合するものであり、ケラチン用組成物の製造方法は、評価した成分をその組成物に配合する。【選択図】なし