Boost Lab makes skincare serums with active ingredients that target different concerns, see info from my previous deal.
From the above link you should be able to request for samples posted to you - I assume these will just be small sachets like this. I filled it in and got an email a day later saying that they are sending 3 samples for my skin concerns.
In case that doesn't work, here's an alternative link for what looks like the same offer.
Thanks OP!