DermaQuest DermaLash is a product that makes such claims. After trying it, I am unable to definitively say yes or no on the matter.
DermaQuest Dermalash consists a conditioning serum with a small brush. The idea is that you are to brush Dermalash at the base of your lashes, and over time the lashes will be fortified, conditioned, longer, and stornger. The serum itself feels fine, and I had no issues trying it and then wearing my contacts. So it seems perfectly safe. But whether it is effective is a big question mark for me.
How can a person really measure this? I used it for about three weeks and can't say that I noticed any difference, but I'm not sure that I really would. It is not like I examine my eyelashes to the point of noticing minute changes. So, I am skeptical, but the product also did no harm. I can't say that I would purchase this (I got mine in some beauty samples and promotional materials), but if you have some eyelash concerns, I suppose it can't hurt anything but your pocketbook to try it!
If anyone has experience with this stuff please post a comment. I'm curious if others saw anything from using it!