Harsh environments can wear down your hair too!?
With humidity and UV rays causing hair to become unruly, 78% of people worry that their hair looks messy.
Gyutto addresses the root cause: damage!
June 30, 2025
Launched in July 2024 by ROHTO Pharmaceutical Co., Ltd. (Headquarters: Osaka City, President: Hidetoshi Seki), "Gyutto (Gyutto" is a hair care product that addresses hair concerns such as peculiar hair, spreading, and stiffness caused by damage. Since its launch, it has recorded sales that significantly exceeded the original plan by 400%, and has been supported by many customers. It is chosen by many people as a new choice for hair care in seasons that are susceptible to moisture and UV damage.
The rainy season ~ summer is the season when problems such as "habit and wavyness" of hair, "spread due to moisture" and "sticky scalp" intensify. In a survey conducted by our company on scalp and hair problems during the rainy season ~ summer (target: men and women in their teens ~ 60s, n=1000/conducted in September 2024), it was found that 78% of people feel that "if their hair is not trimmed, it will look sloppy." In addition, the average self-rating score for ideal hair condition in summer is as low as 60.7 points, and many people find hair problems a challenge. "Gyutto" aims to achieve healthy hair through science that approaches the root cause of not only moisture but also hair problems caused by UV damage in summer.
The impact of hair problems during the rainy season and summer, and the resulting decline in self-esteem.
Our survey revealed that hair and scalp problems during the rainy season and summer have a significant impact on daily life and psychological well-being.
Hair and scalp problems during the rainy season: The battle against humidity
During the rainy season (June to early July), many people suffered from problems such as "frizzy or wavy hair," "frizz due to humidity," and "flyaways and stray hairs" due to the effects of humidity. This tendency was particularly pronounced among women and those with long hair, with high humidity being a major factor in preventing hair from becoming manageable. This poor hair manageability not only affects appearance but also directly impacts psychological burden and behavior, with one in four women reporting feeling "I don't want to go out or meet people if my hair isn't cooperating."
Summer hair and scalp problems: Increased damage to the scalp
During the summer months (July to September), scalp problems such as oily scalp, scalp odor, and scalp sweat are particularly noticeable. The scalp environment is prone to deterioration due to the effects of ultraviolet rays and sweat, and a decrease in hair volume and texture is cited as a challenge unique to summer. These problems are mainly attributed to damage caused by the strong sunlight and hot, humid environment of summer.
The psychological impact of hair problems
78% of people feel that "if their hair isn't styled well, they look sloppy," and the average self-assessment of their hair and scalp in the summer was a low 60.7 points. Women in their 20s and 30s, and those with long or medium-length hair, tended to give themselves lower self-assessments, indicating that hair problems are not just a cosmetic issue, but also affect self-confidence and daily mood.
Style your hair with "Gyutto" and enjoy a comfortable everyday life.
"Gyutto" is a hair care product that addresses seasonal hair concerns, such as those caused by humidity and UV damage, aiming for healthy hair by caring for dryness and frizz. Through daily care, it supports manageability and ease of styling, providing a comfortable hair care routine. At the heart of this is Rohto's unique "Core Corset Technology" *1. This technology approaches both the inside and surface of the hair, repairing damage and improving the texture of each individual strand. With daily care, it aims for hair that can be naturally styled with your fingers.
Customers who have actually used "Gyutto" have given us feedback on its feel and ease of use, such as "I like the smooth texture," and it has gained support from people of all ages.
Core Corset Technology
The frizz-correcting ingredient *2 targets the core of the hair, while the control coating ingredient *3 targets the surface of the hair. This unique technology works by targeting both the core and surface of the hair, repairing damage and improving texture. It improves the texture *5 of each strand of hair that has become frizzy due to damage *4, leading to firm, resilient, and supple hair.
*1: Contains frizz-correcting ingredients (diammonium aminoethylthiosuccinate, lactic acid) and control coating ingredients (PVP)
*2: Aminoethylthiosuccinate diammonium, lactic acid (repairing ingredients)
*3: PVP (repair component)
*4: This refers to the disruption of the internal structure of the hair that maintains its shape due to damage from ultraviolet rays, dryness, etc.
*5: To give firmness and body to the hair
| Product name |
Gyutto Corset Hair Mask |
| Product image |
 |
| Sales name |
R Rohto Hair Mask a |
| classification |
cosmetics |
| Contents |
200g |
| price |
Open price |
- "Gyutto" is a registered trademark of ROHTO Pharmaceutical Co., Ltd.
- "Core Corset Technology" is a registered trademark of ROHTO Pharmaceutical Co., Ltd.
- "Control Coat Ingredient" is a registered trademark of ROHTO Pharmaceutical Co., Ltd.