I haven't heard any real proof of that. I think if I was going to use a supplement for skin and fur, I'd get one of those that contains the essential fatty acids and other things that are proven to be good for the pups.
I have used one in the past called Mrs. Allen's Shed stop. They did look good, but it was a little too expensive for me with two large dogs. We were going through a bottle a week and it is about $20/bottle at Petsmart.

Look in the Drs. Foster and Smith Catalog. It is overwhelming how many there are. And ask you vet for a recommendation too.

Good luck with your beautiful, furry baby!