I have used Reson8 a few times in the past and recently I needed their help again. I have been suffering for a few months with an allergic rash on my chest. Reson8 suggested I send them a sample of the washing detergent that we use for our clothes. I did this and they tested the sample against my blood sample and confirmed that there was a reaction. They suggested a brand that was not causing a reaction, after we changed to this brand the rash started to go and has nearly gone at the time of writing this review. Yet again they have made a massive difference to my quality of life, I would certainly recommend that you use Reson8 to conduct similar allergy checks.