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WEN® Products Safety


Thank you for your interest in the safety of the WEN® by Chaz Dean products. It is important to us that everything we provide is safe because we use these products ourselves, and so do our family, friends, and even our pets. We take this responsibility seriously. To ensure we’re upholding the highest standards, we tasked world-class toxicologists and dermatologists to evaluate everything from our ingredients to our manufacturing facilities.


WEN® By Chaz Dean has and is continuing to do everything it can to ensure product safety is always maintained. Since their inception, WEN® products have been tested through Human Repeat Insult Patch Tests (“RIPTs”). RIPT is a standard test to determine the safety of cosmetic products. To date, the WEN® products have been tested on over 2,700 people without any adverse reactions.


The Assessment WEN® undertook is likely the most comprehensive safety assessment ever performed on a cosmetic product. This assessment was done to evaluate the potential for any adverse effects, including the potential for hair loss, associated with the use of the WEN® products.


Many of these tests have been published as articles in peer-reviewed literature or peer-reviewed presentations at the Society of Toxicology. The articles and presentations have been reviewed and approved by numerous impartial experts who validate the methodology and findings.

1. Screening-level Toxiciological Hazard Assessment

2. Dermal Irritation Assessment of Ingredients

3. Survey of Constituents In Consumer and Personal Care

4. Kathon CG Skin Sensitization Quantitative Risk Assessment

5. Skin Sensitization Induction Risk Assessment

6. Quantitative Risk Assessment of Skin Sensitization Induction from Fragrances Exposure

7. Preliminary In Silico Skin Irritation and Sensitization Assessment

8. In Chemico Skin Sensitization Study-Panthenol

9. In Chemico Skin Sensitization Study-Kathon CG

10. In Chemico Skin Sensitization Study-Stearamidopropyl Dimethylamine

11. In Vitro Irritation Study

12. Endotoxin Testing of WEN Cleansing Conditioners

13. Heat Stress Degradation Of WCD Sweet Almond Mint Cleansing

14. In Vitro Phototoxicity Study

15. IN VITRO HUMAN ASSAY FOR EVALUATING IMMUNOGENIC AND SENSITIZATION POTENTIAL OF WCD PRODUCTS

16. Quantitative Assessment Of Asbestos Fibers In WCD Cleansing Conditioners

17. SURVEY AND QUANTITATIVE RISK ASSESSMENT OF PFAS CHEMICALS INSHAMPOO AND CONDITIONER PRODUCTS 

18. Wen Hair Breakage Analysis

19. ANALYSIS OF COMPLAINANTS' SUBMISSIONS IN MASS ACTIONS ALLEGING HAIR LOSS AS A RESULT OF USE OF THE WEN CLEANSING CONDITIONER PRODUCTS

20. Halo-Effect Analysis on Adverse Event Reporting of WCD Products

21. Allergenic Potential Report

22. Allergic Contact Dermatitis Clinical Trial Report