Tried this many times with samples, and even bought a whole box to make sure I've tested these strips well enough. Maybe my nose doesn't have blackheads for these to even work but when my friend tried them they were able to get something out of it. They told me the Biore strips were better at getting the bigger blackheads while the LUKE ones took out the smaller ones. I've also found the smell of these strips not pleasant, it seems to be like a seaweed perfumey scent? Overall I won't purchase these again, but if there samples, I would gladly give it to friends to try.