The phototoxicity test is an in vivo evaluation designed to assess a product’s potential to induce adverse skin reactions when exposed to light, particularly UV radiation.

This test provides objective evidence for claims such as “dermatologically tested under UV exposure,” “safe for use in sun-exposed conditions,” and “non-phototoxic.”

Purpose of the Test

The goal of this test is to determine whether a cosmetic product remains well tolerated when the skin is exposed to UV light after application.

It is particularly relevant for daytime skincare products, sunscreens, leave-on formulations, and products intended for use in sun-exposed conditions.

Methodology

The study is performed as an in vivo clinical assessment, combining controlled UV exposure with dermatological evaluation.

• Number of volunteers: 10
• Measurement points: Baseline and post-exposure assessments under controlled conditions
• Duration: 14 days
• Test conditions: Controlled UV exposure following product application
• Number of samples required: 50 ml of finished product

Test Procedure

1. Volunteer selection:
   Ten participants with healthy skin are selected for controlled exposure testing.
2. Baseline assessment:
   Skin condition is evaluated prior to product application and UV exposure.
3. Product application:
   The test product is applied to designated skin areas according to protocol.
4. UV exposure:
   Treated areas are exposed to controlled UV light under standardized conditions.
5. Post-exposure evaluation:
   Skin is assessed for any visible reactions such as redness or discomfort.
6. Data analysis:
   Observations are recorded and analyzed to determine the product’s phototoxic potential.

Parameters Evaluated

• Skin reaction to UV exposure — visual dermatological assessment
• Signs of irritation — redness, edema, or discomfort
• Reaction intensity and classification
• Overall skin tolerance under light exposure conditions
• Safety profile in UV exposure context

Sample Requirements

• Quantity: 50 ml of finished product
• Condition: Stable, ready-to-use formulation
• Product types: Leave-on products, sunscreens, and daytime skincare formulations

Results & Reporting

The laboratory report includes:

• Dermatological evaluation of skin responses
• Classification of observed reactions
• Summary of product tolerance under UV conditions
• Expert interpretation confirming phototoxicity profile

Why This Test Matters

The Phototoxicity Test provides essential safety data to ensure that a product does not induce adverse reactions when exposed to light.

It supports claims such as:

• “Non-phototoxic”
• “Safe for use under sun exposure”
• “Dermatologically tested under UV conditions”

This test is critical for product safety validation, regulatory compliance, and consumer protection, ensuring that formulations are suitable for use in real-life exposure conditions.

Phototoxicity vs Photoallergy

Both tests evaluate skin reactions under UV exposure, but they address different risks.

Phototoxicity measures immediate irritation caused by the interaction between a product and UV light, typically appearing within hours after application.

Photoallergy assesses delayed, immune-mediated reactions that develop after repeated exposure, usually appearing days later.

Together, they provide a complete evaluation of both immediate and long-term skin tolerance under UV exposure.

How the Process Works

1. Order your lab test
   Select the appropriate package and complete your purchase on our website.
2. Receive secure access
   After purchase, you’ll receive login details to our secure portal.
3. Complete the intake form
   Provide your product details and upload available documentation.
4. Send us your samples
   We’ll guide you on exactly what to send to our lab. The sample amount and number depends on several factors. The exact number of samples will be communicated via the portal.
5. Lab testing
   We start the lab test.
6. Receive your results
   Our safety assessor will prepare the lab test results and provides this via the portal.