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Evaluation of Human Hair Absorption and Retention
Jeonghoon Yun1,2, Song Hee Kim1, Hyeyeon Yoo3
1Sunjin Clinical Research Center, Sunjin Beauty Science Co., Ltd., Seoul, Korea.
Clinical, Cosmetic and Investigational Dermatology
|October 13, 2025
Summary
A new study shows hair care products significantly improve nutrient and moisture absorption into hair compared to water or no treatment. This 3D Raman spectroscopy method offers a better way to evaluate hair product efficacy and absorption.
Area of Science:
- Dermatology and Cosmetology
- Materials Science
- Spectroscopy
Background:
- Hair loss (alopecia) affects up to 50% of the population, impacting social and psychological well-being.
- Effective hair care relies on nutrient and moisture absorption, yet evaluation methods are limited.
- Understanding hair shaft penetration is key to developing effective hair loss treatments and products.
Purpose of the Study:
- To assess the absorption and retention of nutrients and moisture in human hair using 3D Raman spectroscopy.
- To compare the efficacy of a supplemental hair care product against untreated and water-treated hair.
- To establish a novel method for evaluating hair absorption and product effectiveness.
Main Methods:
- A double-arm study design was employed with three conditions: untreated hair, water-treated hair, and hair treated with a supplemental hair care product.
- 3D Raman spectroscopy with 3D imaging technology was utilized to analyze absorption amount, depth, and dryness at 30-minute intervals.
- Statistical analysis was performed to confirm the significance of observed differences in absorption and retention.
Main Results:
- Hair treated with the supplemental product demonstrated significantly higher absorption amounts and deeper penetration compared to untreated and water-treated hair (p < 0.05).
- Product-treated hair showed reduced dryness and maintained absorption parameters over 30 minutes (p < 0.05).
- 3D Raman visualization provided detailed spatial distribution and confirmed long-term retention of absorbed substances within hair fibers.
Conclusions:
- The study validates the superior absorption and retention capabilities of the tested hair care product in human hair.
- The developed 3D Raman spectroscopy method sets a new standard for evaluating hair absorption and product efficacy.
- This technique presents a promising tool for future clinical research and the development of advanced hair care solutions.
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