The hair thickness measurement test is a precise laboratory test that measures the diameter of individual hair strands to determine the effect of cosmetic products on the body, strength, and fullness of the hair. It provides visual and quantitative evidence of improvements in hair thickness and fiber volume after regular use.

Purpose of the test

The purpose of this test is to evaluate whether a cosmetic formula can increase the thickness of hair strands, improve structural integrity, or enhance the overall volume and body of the hair. It supports claims such as “thicker hair,” “increases volume,” “strengthens hair fibers,” and “strengthens every strand.”

How the test works

The hair thickness test is conducted using a device test with a digital microscope or trichoscope capable of capturing detailed images of the hair at a magnification of x200. The diameter of the hair strands is measured before and after a specific treatment period. The data allows for an accurate comparison of hair thickness and structural changes resulting from regular product use.

Applications in cosmetic testing

• Evaluation of volumizing and thickening hair care products
• Testing of strengthening shampoos, conditioners, and serums
• Validation of the claims “increases hair diameter” and “gives hair more body and fullness”.
• Assessment of anti-breakage and strengthening formulas
• Support for hair growth and density-improving product claims

Test procedure

1. The study includes 10 volunteers under dermatological supervision.
2. Images of the baseline hair strand are taken at 200x magnification to record the initial thickness measurements.
3. Participants apply the test product regularly over a specified treatment period (e.g., 4–8 weeks).
4. After the treatment period, new measurements and images are taken using the same imaging setup.
5. Data from before and after product use are compared to calculate the average increase or change in strand diameter.

Results and reporting

The final report includes:

• Detailed information about the test protocol and equipment
• Data on hair strand thickness during and after treatment
• Microscopic photos at 200x magnification
• Statistical analysis of variation in hair diameter
• Interpretation of thickening effectiveness and product performance

Why this test is important

Hair thickness is a visible indicator of vitality and the performance of cosmetic products. This test provides measurable and photographic evidence of how a product improves the body and structure of the hair. It is essential for scientifically substantiating claims regarding volumizing, strengthening, and firming.

Sample requirements

• Minimum quantity: 50–100 ml or g of finished product
• Number of samples: 11 finished products
• Product type: shampoos, conditioners, serums, or tonics
• Storage: room temperature unless otherwise specified

Test parameters

• Duration: typically 4–8 weeks of regular product use
• Measurement intervals: before and after treatment
• Participants: 10 volunteers
• Magnification: x200
• Unit of measurement: micrometers (µm)
• Proprietary methodology: I06/PO-08

Turnaround time

The typical turnaround time is 5–8 weeks, depending on the duration of treatment and the imaging schedule.

Deliverables

• Comprehensive laboratory report in PDF format
• High-resolution before-and-after images at 200x magnification
• Quantitative data showing changes in hair shaft thickness
• Summary suitable for regulatory and marketing documentation

Compliance and Standards

The hair thickness test is conducted in accordance with Good Clinical Practice (GCP) and international cosmetic testing standards. All procedures follow the internal methodology I06/PO-08 and are performed with calibrated equipment under controlled laboratory conditions to ensure accuracy and reproducibility.