Patch Test

Patch testing helps you assess the tolerability of your cosmetics and reveals possible irritants and allergic effects. EUROLAB Dermatological compatibility tests comply with guidelines for the use of human volunteers in compatibility testing of finished cosmetic products. These include patch tests and human repetitive insult patch tests (HRIPT).

Our Patch Testing Methods

We perform established patch protocols such as patch tests and human repeat defamation patch tests (HRIPT) based on current guidelines to evaluate non-irritant and hypoallergenic claims for cosmetics.

Patch testing was performed on 10, 12, 20 or 30 volunteers. However, you can customize your number of subjects depending on your needs.

During a patch test, we apply the trace of the ingredient or finished product on an occlusive patch. We then apply the patch to adult volunteers for 48 hours, directly on the skin of their backs.

Our experienced dermatologists make a clinical observation of the effects on the skin after the patch is removed. Irritant potential is ranked according to a predetermined scale corresponding to the degree of irritation.

Results are classified as follows:

• Negative (-)
• Irritant reaction (IR)
• Definite / uncertain (+/-)
• Weak positive (+)
• Strong positive (++)
• Overreaction (+++)

HRIPT Method

We use the human repeated insult patch test (HRIPT) to examine skin compatibility and the absence of allergic potential of cosmetic products. This is evaluated after repeated application to the skin under extreme experimental conditions.

Our Dermatologists:

• Apply the patch with the product directly on the skin of the hearts for a specified time.
• Repeat applications 3 times for 9 consecutive weeks, the time required for possible induction of an allergy.
• Expect at least a 2-week rest period without any patch application.
• Continue with a single patch application to the previous induction site and a virgin area for a specified time.
• Check for possible induced allergies after the patches are removed.

our offer

Under the supervision of experienced dermatologists, we offer:

• Customized patch tests
• Dermatological evaluations
• Pool of 18 volunteers, men and women, 65 to 1200 years old, with different skin types
• You can also customize your patch test panel according to your needs.

Our compliance with legal requirements

• Regulation (EC) No 1223/2009 - On cosmetic products.
• EU Regulation 655/2013 - On common criteria for justification of claims used in relation to cosmetic products, including accuracy, evidence support and honesty.
• SCCS Notes - Guidance notes for the testing and safety assessment of SCCS cosmetic ingredients.

EUROLAB, with its highly expert team and internationally accredited laboratories, Patch Test It performs all test, analysis, measurement, evaluation and report generation services completely and reliably.