The Hair Thickness Measurement Test is a precise laboratory evaluation that measures the diameter of individual hair strands to determine the effect of cosmetic products on hair body, strength, and fullness. It provides visual and quantitative proof 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 formulation can increase hair strand thickness, enhance structural integrity, or improve the overall volume and body of the hair. It supports claims such as “thicker hair,” “increases volume,” “reinforces hair fibers,” and “strengthens each strand.”

How the Test Works

The Hair Thickness Measurement Test is conducted using an Apparatus Test with a digital microscope or trichoscope capable of capturing detailed hair images at x200 magnification. Measurements of hair strand diameter are taken before and after a defined treatment period. The data allows precise 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 “increases hair diameter” and “adds body and fullness” claims
• Assessment of anti-breakage and fortifying formulations
• Support for hair growth and density-enhancing product claims

Test Procedure

1. The study includes 10 volunteers under dermatological supervision.
2. Baseline hair strand images are captured at x200 magnification to record initial thickness measurements.
3. Participants apply the test product regularly for a defined treatment duration (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 mean increase or change in strand diameter.

Results & Reporting

The final report includes:

• Detailed test protocol and apparatus information
• Baseline and post-treatment strand thickness data
• Microscopic photographs at x200 magnification
• Statistical analysis of hair diameter variation
• Interpretation of thickening efficacy and product performance

Why This Test Matters

Hair thickness is a visible indicator of vitality and cosmetic product performance. This test provides measurable and photographic evidence of how a product improves hair body and structure. It is essential for substantiating volumizing, strengthening, and fortifying claims with scientific accuracy.

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
• Imaging magnification: x200
• Measurement unit: micrometers (µm)
• In-house methodology: I06/PO-08

Turnaround Time

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

Deliverables

• Comprehensive laboratory report in PDF format
• Before-and-after high-resolution images at x200 magnification
• Quantitative data showing changes in hair strand thickness
• Summary suitable for regulatory and marketing documentation

Compliance & Standards

The Hair Thickness Measurement Test is conducted in accordance with Good Clinical Practice (GCP) and international cosmetic testing standards. All procedures follow in-house methodology I06/PO-08 and are carried out using calibrated equipment under controlled laboratory conditions to ensure accuracy and reproducibility.