February 16, 2011

Male Aging Hair Study Conducted by Mandom
Shows Middle-Aged Scalp Oils Are More Viscousand Decrease Head Hair VolumeMandom Corporation (headquarters: Osaka; CEO: Motonobu Nishimura; hereinafter, “Mandom”)
conducted a study of the scalp and head hair of Japanese men and showed that oils on the scalp (scalp lipids) area factor in decreased head hair volume as well as thin hair in middle-aged men (late 30s through 50s). Comparedwith that of young men (late teens through 20s), the lipid composition of the scalp in middle-aged men hasa higher percentage of triglycerides, is more viscous (viscosity property) and less fluid. Mandom reflected theresults of this study in its styling agent Lucido, a brand for middle-aged men that went on sale in February 2011,and has proposed a mechanism for absorbing highly viscous scalp oils and maintaining volume.
Mandom has applied for a Japanese patent based on the results of the evaluation study, which used a scalp
oil model of middle-aged men.

１．30% of men with reduced head hair volume have oily hair
A known concern of men regarding head hair is the phenomenon of reduced volume or thinning hair.
In an awareness survey conducted in June 2010, 1 in 5 men in their 40s responded that they had no hair volume,
their hair was thin, and they had little hair. Meanwhile, approximately 30% of those who felt that they had nohead hair volume felt that they had oily head hair, compared with approximately 20% of people who felt they
had head hair volume. Therefore reduced head hair volume and oily head hair were suspected to be related
in some way.

2．Thinning hair and reduced volume
In September 2006, Mandom conducted a study of 71 middle-aged and young men and confirmed reduced
volume and firmness/resilience in terms of both appearance and texture (published June 2007 by the Japan
Society for Biomedical Gerontology). Middle-aged men had thinner hair than young men (Figure 1). In addition,
there was found to be a correlation between hair thickness and volume and that volume decreased as the hairthinned (Figure 2). These observations indicate that one reason for reduced head-hair volume in middle-aged
men is thinning hair due to aging.

Contact

mandom corp.
Public Relations Div.
mail: press@mandom.co.jp

URL: https://www.mandom.co.jp/en/

Please contact us in Japanese or English.

-1-Young men

Thin

Middle-aged men

Hair thickness (μm)

ThinThickness of parietal hair (μm)

Reference image: Microscope observations(representative example)

ThickLow

VolumeHigh

Bulk density: Touch evaluation by a cosmetic expert(functional evaluation)
Young men (n=32)

n=71
Spearman's rank correlation coefficient
r=0.673 p<0.01
Figure 2. Relationship between hair thickness and volumeMiddle aged men (n=33)

Thick
Figure 1. Change in hair thickness by age group(9/2006-5/2007 Mandom Study
10–60-year-old men/n=71)

3．Middle-aged men have viscous scalp oils?

Scalp oil composition

Mandom sampled and analyzed the scalp oils of middle-aged men (40s to 50s, n=22) and young men (20s,n=21). The results showed that the quantity of scalp oils did not differ by age group and that the scalp oils of
middle-aged men contained fewer free fatty acids and a higher content of triglycerides (Figure 3). Furthermore,a model of the scalp oils in each group was prepared based on the analytical values, and the viscosity (degree ofstickiness) was compared. The results showed that scalp oils in middle-aged men were at least twice as viscousand were less fluid than those in young men (Figure 4).

Triglycerides
Free fatty
acids
Other
Scalp oils of young men Scalp oils of middle-aged men
Figure 4. Difference in artificial scalp oil fluidity
Young men Middle-aged(n=21)
men (n=22)

Figure 3. Change in the compositionof scalp oil by age group-2-4．Do the viscous scalp oils of middle-aged men cause reduced hair volume?
Mandom observed the hair quality of middle-aged men in their 40s who provided their cooperation(informed consent was obtained). Although their head hair was soft and voluminous immediately after washing,
it appeared oily and bundled, with reduced volume, 2 days after washing (Figure 5).
Furthermore, when artificial middle-aged male scalp oils prepared based on analytical values were applied
to the hair immediately after washing, the condition of the hair was the same as that observed 2 days afterwashing (Figure 5), so scalp oils on the hair decreased the head-hair volume.

Immediately after washing

2 days after washing

Artificial middle-aged scalp
oils applied after washing

Figure 5. Effect of scalp oil on head hair volume

Middle-aged men develop age-related head-hair thinning and volume reduction, and in addition, secrete moreviscous scalp oils that attach to the thin hair, causing it to bundle, which is believed to decrease volume further(Figure 6).
This study showed that scalp oils differed in composition between middle-aged men and young men andcaused reduced head-hair volume in middle-aged men.
Mandom will continue to study scalp/head hair in the future and recommend the development of cosmetic
head-hair products suited to middle-aged men.

Middle-aged men

Young men

Volume decreased
even further

Decreased volume
Thin hair

Scalp oilsecretion

Figure 6. Mechanism of head-hair volume reduction in middle-aged men

End of document-3-