Kao confirms that it is difficult to feel irritation by suppressing the adhesion of fine particles to the skin

 By suppressing the adhesion of fine particles such as dust and pollen to the skin, Kao raises the 5Hz current perception threshold for skin that is sensitive to things coming into contact with the skin, making it less likely to cause irritation. confirmed to be The results of this research were announced at the 5th Annual Meeting of the Japanese Society of Photodermatology.


Invisible fine particles such as dust and pollen float in the air, and the effects of these fine particles on the skin can make the skin look dull and cause problems such as rough skin. .


In particular, it has been reported that skin with a weakened barrier function becomes prone to itchiness when air pollutants adhere to the skin. In addition, a survey conducted in Japan, China, and Thailand on people with sensitive skin revealed that pollen and air pollution are also considered to be factors that make the skin sensitive. The company has developed a technology that suppresses the adhesion of fine particles to the skin, and this time, we verified the effect of this technology on the skin.

Stratum corneum barrier function (TEWL) and current perception threshold (CPT value) are known as indices for evaluating skin sensitivity. Therefore, when we investigated the awareness of sensitivity to external factors coming into contact with the skin, it was found that there was a correlation that the higher the score for feeling discomfort due to air pollution and the discomfort caused by contact stimulation, the lower the CPT value. have understood. On the other hand, no correlation was found between TEWL, a general index of dry and sensitive skin, and awareness of contact sensitivity.


The company conducted a 4-week trial in March and April, when pollen and fine particles are often scattered, on 87 women aged 20 to 49 who responded that they felt uncomfortable with external stimuli such as pollen and fine particles. Subjects continued to use the product or 3% control product. As a result, at the CPT value of the current frequency of 5 Hz, which causes itching in people with sensitive skin, the group who continued to use the test product significantly reduced the sensation of irritation in both the cheeks and around the eyes. 

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