Stratum corneum turnover studies evaluate the skin’s renewal process and help assess a product’s ability to improve skin appearance, texture, and overall condition.
What you can expect from collagen product trials
Collagen production testing is designed to evaluate the impact of topical and cosmetic products on the visible appearance of skin firmness, elasticity, and overall structure.
These studies are commonly used to support anti-ageing and skin rejuvenation claims, particularly where products are positioned to improve skin texture and resilience over time.
All testing is conducted on cosmetic, toiletry, or personal care products only, and is not intended to assess medical or therapeutic effects on connective tissue.
Study Design
Study design is tailored depending on the product type and intended claims.
Trials typically involve a panel of healthy volunteers with visible signs of skin ageing, such as reduced elasticity, fine lines, or loss of firmness.
Studies are conducted over a defined period (commonly 4–12 weeks, depending on protocol requirements), with assessments performed at baseline and at scheduled intervals throughout the study.
Products are applied under controlled or in-use conditions, with comparison made against baseline and, where applicable, untreated or control sites.
Assessment Methods
PCR uses a combination of instrumental, clinical, and visual assessment techniques to evaluate changes in skin appearance, including:
- Cutometer measurements to assess skin elasticity and firmness
- High-resolution imaging for visual documentation of skin texture changes
- Ultrasound imaging to assess dermal structure and density (where applicable)
- Clinical grading by trained assessors
- Participant self-assessment questionnaires on perceived skin improvement
- Standardised photography under controlled lighting conditions
These methods provide both objective measurement and perceived improvement data.
How Results Are Measured
The primary focus of collagen-related studies is the change in skin firmness, elasticity, and surface appearance over time.
Results are compared against baseline measurements to determine whether the product demonstrates a measurable improvement in skin structure and appearance.
What the Data Supports
Collagen production testing can be used to support claims such as:
- Improves skin firmness and elasticity
- Supports skin structure and resilience
- Reduces the appearance of fine lines
- Enhances overall skin smoothness and tone
- Supports anti-ageing cosmetic performance claims