Permanent hair colour requires a permanent oxidative pigment to work - be it PPD, PTD, PTDS or PTS - and all of these have the potential to cause an allergic reaction. Oiamiga uses PPD at the lowest possible level to get a great result, which reduces the risk of a reaction.
If you have a known PPD allergy, we'd recommend you contact us - we'd be very happy to help you choose from the other brands we stock.
Our friendly support team are here to help, so please do contact us.