I've purchased 3 Groupon vouchers 5 days ago. Then I did a research about this company The Allergy Testing Company (should do before), and figured out that it is 100% scam.
I haven't redeemed my vouchers yet, so I asked them for refund. They emailed me, saying "If you require a refund then please contact Groupon since the payment was made to Groupon." They do know that Groupon does refund in the first 3 days only. However, the Groupon Refunds policy stays: "Your voucher may always be redeemed at the merchant who issued it for at least the amount you paid for it even if the promotional value has expired." After I told them about it, they stopped responding on my emails.
Which means The Allergy Testing Company might do a refund. But if you look closely at their web site, they even don't have Refund Policy, or Privacy Policy, or Terms and Conditions. Because IT IS FAKE WEB SITE and it's FAKE COMPANY!
This web site exists 6 months. The owner is unknown. They play with customers health and lives, sending fake test results.
It seems, most Groupon reviews are fake as well.
Please, stay away from scam!