dr. perricone. they say, "i hate my neck. my neck makes me look so much and i think it was just so brilliant, what you've developed, because, to me, sub-d is the most powerful in-home treatment you've ever seen. >> yeah, it's extraordinary. and these products are what we call cosmeceuticals. can you explain what that means? >> so, we all know what a cosmetic is. a cosmetic is something that's supposed to improve your appearance. and a pharmaceutical, of course, is something very different, which is a medicine. sub-d is not a pharmaceutical. this formula is the result of a lot of research, and we're using some unique ingredients, so that's what the unique feel is and unique color. when you take that out of the jar and you start applying to your skin, it works on a very basic mechanism. i just didn't know that that mechanism was so powerful. >> so, how is the skin on the neck different from the skin on your face? >> well, the skin on the neck tends to be a little bit on the thinner side. and so, subse