Skin Irritation Test

The performance of safety tests prior to the market launch of cosmetics, detergents, biocidal products, and pharmaceutical products, which directly impact consumer health, is a legal and ethical obligation. One such test, the skin irritation test, is conducted to determine the irritant effects of products on living tissue.

What is a Skin Irritation Test?

Irritation analysis comprises a series of tests designed to evaluate the short-term, reversible irritation a product may cause upon contact with living tissue such as skin, eyes, or mucous membranes. Especially for topically applied products, these analyses determine whether they are formulated to be safe for the user.

For which products is skin irritation testing required?

• Cosmetic Products (creams, lotions, make-up products)
• Biocidal Products (hand sanitizers, surface cleaners)
• Cleaning Products (bleaches, detergents)
• Medical Devices and Pharmaceuticals (dermally applied products)
• Packaging Materials (materials that come into contact with food and pharmaceuticals)

Skin Irritation Testing Procedures

Irritation analyses are typically conducted in vitro (in the laboratory) or in vivo (on living organisms). In recent years, alternative testing methods have been adopted to reduce animal testing.

1. Skin Irritation Test

Used for products that come into direct contact with the skin. Common methods include:

• OECD TG 439: In vitro test using reconstructed human epidermis models
• Draize Test (in vivo): A traditional method, though its use is now restricted due to ethical considerations.

2. Eye Irritation Test

Assesses the potential damage products may cause upon ocular contact.

• OECD TG 492: In vitro test with artificial corneal models
• BCOP Test (OECD TG 437): Test using bovine cornea
• ICE Test (OECD TG 438): Performed using isolated chicken eyes

3. Mucosal Irritation Test

Particularly applicable for products intended for vaginal, rectal, or oral administration.

Skin Irritation and Corrosion Toxicity: OECD 439