Single 48-hour occlusive patch test that assesses your product's skin-irritation potential.
The purpose of the patch test is to determine whether a cosmetic product causes irritation on the skin — it assesses the skin-irritation potential of your finished product. Approximately 0.2 g/ml of product is applied to the intact skin of the back or arm of adult subjects and kept under an occlusive or semi-occlusive patch for 48 hours. Leave-on products are tested undiluted, while rinse-off products are diluted. Skin reactions are then read 1 hour and 24 hours after the patch is removed.
| Parameter | Details |
|---|---|
| Test typeThe category of analysis performed and what it evaluates. | Skin irritation (patch) test |
| MethodHow the test is carried out in the laboratory. | Single application, 48h under occlusive / semi-occlusive patch |
| PanellistsThe number of human volunteers the test is performed on. | 12 adult subjects |
| Sample applicationHow the product is applied to the skin during the test. | ~0.2 g/ml on intact skin of the back or arm |
| Sample dilutionWhether and how the product is diluted before it is tested. | Leave-on neat; rinse-off at 1%, 5% or 10% |
| ReadingsWhen the skin reactions are assessed after the patch is removed. | 1 hour and 24 hours after patch removal |
| Total durationThe overall time from start of testing to your finished report. | 2 weeks |
| Report formatThe format of the final report you receive. | Signed PDF report |
Certified laboratory
Our laboratory takes part in BIPEA’s interlaboratory proficiency testing (Bureau Interprofessionnel d’Études Analytiques, Paris). These independent comparisons benchmark our analytical results against laboratories worldwide — confirming the accuracy and reliability of every report we deliver.
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The mandatory safety assessment for every cosmetic product, signed by a qualified assessor.
REACH-compliant 16-section Safety Data Sheet for B2B sales, in 30+ languages.
All four lab tests + the mandatory CPSR โ everything you need to place a cosmetic product on the market, in one order.
The Cosmetic Product Safety Report paired with a Safety Data Sheet โ your core compliance documents together.
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“I was dubious before my first purchase. This is my second time using this company & I had a great experience. They answered all my questions and all my tests were completed with full reports & photos to back them.”
“I recently had the pleasure of working with Cosmetic Testing Lab, and I must say, they exceeded all my expectations! From the moment I reached out to the final delivery of results, the entire experience was nothing short of exceptional.”
“I would definitely recommend online cosmetic testing lab to any brands needing testing for their products. They made the process really expedient and even arrange the samples to be picked up from your door.”
“Julija & the rest of the team are amazing. They kept me informed every step of the way and were on hand to answer any questions that I had. Would highly recommend!”
“Excellent service! Timely response and communication updated through each phase. Highly recommend.”
“Waiting sometimes up to 6 months to be certified elsewhere. I came across Cosmetic Testing Lab on the internet. Bit different for me — it was so easy, fast and the prices were very reasonable. My safety assessment was ready remarkably fast. Can't thank them enough.”
“The process is so easy and fast. I always hated sending inquiries, negotiating for the price and searching for the best offer. With CTL it took me so much less time — everything is transparent and simple.”
“This company deserves more than 5 stars. Tadej and Kristina are so professional. I had been looking for how to go about my product challenge and stability testing for over a year until I found Cosmetic Testing Lab. Very satisfied!”
“Tadej and his team were very helpful, swift, and helped my cosmetics company with getting products EU compliant — which seemed a daunting task but he made it very simple and easy. Highly recommended!”
“I worked with CT Lab on a CPSR for two fragrance products. The team was very patient, helpful, and professional. The assessment was incredibly thorough and turnaround time was faster than expected.”
“Tadej and his team are very professional, responsive and handle inquiries very efficiently. I highly recommend their service to any individual or business needing EU cosmetic regulation advice.”
“Outstanding lab — everything from the ordering process to receiving the final results was handled with professionalism and care. Response times were fantastic and the team were incredibly helpful throughout.”
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A challenge test is required for every cosmetic product except microbiologically low-risk ones, which are:
A challenge test is required for every cosmetic product except microbiologically low-risk ones, which are:
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