Winter is coming! This means that it is the perfect time to test hydrating products or moisturizers on the skin by Evalulab

14 December 2021 

Brands require that their products be tested under the conditions closest to instructions of use, hence the need for representative subjects in terms of: 

  • ethnic groups, 
  • skin types (normal, dry, oily, or sensitive) and 
  • environmental conditions (extremely cold or hot). 

Evalulab has conducted over a thousand clinical studies for over 20 years on the efficacy and safety of topical products in the coldest conditions of North America. 

Winter is coming! This means that it is the perfect time to test hydrating products or moisturizers on the skin. 

How do you demonstrate that a topical product hydrates? 

Epidermal moisture of the stratum corneum can be assessed by non-invasive in vivo instrumental testing method based on the capacitance, an electrical property of the skin, expressed in arbitrary units via the Corneometer®

To clinically evaluate the hydration levels, measurements are taken before the application of the product to be tested at time t=0 and then at various times after application of the test product. 

The skin has a barrier role against the external aggressions for the body. In healthy and intact skin, the barrier function is effective and water loss rates are very low. 

If the barrier is compromised due to pathological, physical, or chemical damage, the rate of trans-epidermal water loss increases, indicating a degree of damage. Thus, the Tewameter® is used to measure the rate of water loss through the skin and to determine the state of health of the skin. 

Evalulab guarantees the validity and authenticity of the study results by adhering to the strict measures put in place by the test protocol, good clinical practices (GCP) and by requesting approval of study protocols by an ethics committee. 

Also, Evalulab has developed standard protocols to evaluate the short- and long-term changes of one or more topical products, to verify the level of hydration or their capacity to repair the skin barrier in cold, normal and/or extreme weather. 

Original source : 



Elisabeth Fiquet 


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