Step 10. Challenge Testing
If your product contains water, then we will send it to a microbiological testing laboratory to have it challenge tested and to demonstrate that your preservation strategy is completely safe.
If you have included stability testing in your overall natural cosmetic formulation package, then we will have already undertaken some of our own tests to demonstrate that the preservation system is adequate, but ideally we will also have the finished formulation professionally challenged. It is mandatory to undertake this step in the EU but we strongly recommend it for all of our customers.
Please note that challenge testing will take around 4-6 weeks to complete and the lab will require your product to be in its final packaging. The cost of a typical challenge test is approximately £350 / €500 / US$550.