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Season 2: All about Science

Studies, Evidence & Assessment of Efficacy

Dr. Manfred Groeppel, Prof. Dr. Alexander Steinkasserer 26.05.2026 01:48

In summary

  • Studies are expected to show visible differences, for example through blinded before-and-after assessments 
  • Scientific evidence means statistically significant differences in hair count, thickness, or length are confirmed 
  • Early studies provide the first real-world data and demonstrate biological efficiency and product safety 
  • They give guidance on optimal concentration, application frequency, and relevant target groups 
  • These initial findings are essential for a product's further development
FAQ

Studies, Evidence & Assessment of Efficacy

What be realistically expected from a study?
Visible differences, for example through before-and-after pictures. One method: experts receive unlabeled image pairs and are asked to identify which were taken before and which after the application.
What does scientific evidence mean in the context of hair and skin care?
Scientific evidence means that statistically significant differences between before and after the therapy can be demonstrated. This could be the number of hairs, their thickness, or, in the case of eyelashes, their length.
Why are early studies important, even when they are still small?
Early studies, even small ones, provide the first real-world data and demonstrate biological efficiency and product safety. They give guidance on optimal concentration and application frequency, and can reveal whether a product works particularly well for certain groups, such as women, older users, or people with specific hair types. These early findings are essential for a product's further development.

Description

What can you realistically expect from a study? Visible differences, for example through before-and-after pictures. One method: experts receive unlabeled image pairs and identify which were taken before and which after the application. 

Scientific evidence specifically means: statistically significant differences between before and after the therapy. This could be the number of hairs, their thickness, or, in the case of eyelashes, their length. 

Early studies, even small ones, matter. They provide the first real-world data, demonstrate biological efficiency, and confirm product safety. They also give guidance on optimal concentration and application frequency, and reveal whether a product works particularly well for certain groups: women, older users, or people with specific hair types.

Experts

Dr. Manfred Groeppel
Dr. Manfred Groeppel
Prof. Dr. Alexander Steinkasserer
Prof. Dr. Alexander Steinkasserer
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