If you’ve purchased one of our hair testing kits, you will have to pay the cost of the postage back to the processing centre here in the UK. If you’ve purchased a blood intolerance test, you will receive a free post return envelope in the kit which is sent to you. We try to keep our costs as low as possible (by not sending out physical hair testing kits) so that we are able to offer such a comprehensive and accurate test at the price offered. Please ensure the correct postage amount has been paid as we are not liable for any extra charges.