Never heard of Dermoscent, but my cat Smudge used to be VERY itchy and the first thing the vet recommended was the fish oil. It turned out to be allergies, and he gets medicine for that too, but meanwhile his long, ultra-fine fur has gotten a lot healthier and easier to keep neat, even in muggy weather.

A cat I occasionally sit for has really bad dandruff and arthritis, and I can't get her to even TRY fish oil! I put it on gourmet kibble (a spoonful of Smudge's Indigo Moon, which he seems to consider "bowlful of treats") and on Kitty Kaviar herring flakes, and she won't touch it! Luckily, she will eat Cosequin mixed into Fancy Feast, so she's getting that twice a day. But a cat who won't eat fish oil is a mystery to me.

Love, Columbine