Abstract: PROBLEM: To provide a hair growth agent which is a topical agent that exhibits effect in terms of causing increase in hair shaft diameter and improving maximum hair shaft length and improving hair shaft elongation rate and new hair growth and increasing expression of genes contributing to hair growth in dermal papilla cells and promoting hair shaft growth at head hair, beard, eyelashes, and/or eyebrows. SOLUTION MEANS: A hair growth agent which is a topical agent is made to contain active ingredient(s) in the form of palmitoyl dipeptide-5 diaminobutyloyl hydroxythreonine and palmitoyl dipeptide-5 diaminohydroxybutyrate, and/or adenosine.

Abstract: To provide a hair growth agent and a scalp care agent which are topical agents that exhibit scalp care effect as well as effect in terms of causing increase in hair shaft diameter and effect in terms of improving maximum hair shaft length and improving hair shaft elongation rate and new hair growth and increasing expression of genes contributing to hair growth in dermal papilla cells and promoting hair shaft growth at head hair, beard, eyebrows, and/or eyelashes, these are made to contain an active ingredient in the form of phytosphingosine.

Abstract: To provide an agent that increases expression of genes contributing to hair growth in dermal papilla cells, a scalp care agent, and a hair growth agent which are topical agents that exhibit effect in terms of causing increase in hair shaft diameter and improving maximum hair shaft length and improving hair shaft elongation rate and new hair growth and increasing expression of genes contributing to hair growth in dermal papilla cells and promoting hair shaft growth at head hair, beard, eyelashes, and/or eyebrows, such agents are made to contain an active ingredient in the form of palmitoyl dipeptide-5 diaminobutyloyl hydroxythreonine.

Abstract: To provide an agent that increases expression of genes contributing to hair growth in dermal papilla cells, a scalp care agent, and a hair growth agent which are topical agents that exhibit effect in terms of causing increase in hair shaft diameter, and improving maximum hair shaft length, and improving hair shaft elongation rate, and new hair growth and increasing expression of genes contributing to hair growth in dermal papilla cells, and promoting hair shaft growth at head hair, beard, eyelashes, and/or eyebrows, such agents are made to contain an active ingredient in the form of palmitoyl dipeptide-5 diaminohydroxybutyrate.

Abstract: To provide a hair growth agent which is a topical agent that exhibits effect in terms of causing increase in hair shaft diameter and improving maximum hair shaft length and improving hair shaft elongation rate and new hair growth and increasing expression of genes contributing to hair growth in dermal papilla cells and promoting hair shaft growth at head hair, eyelashes, and/or eyebrows, a hair growth agent which is a topical agent is made to contain active ingredients in the form of palmitoyl dipeptide-5 diaminobutyloyl hydroxythreonine and palmitoyl dipeptide-5 diaminohydroxybutyrate.