About six months ago, I adopted two cats from a local shelter who are the light of my life. One of my cats, "Prof. Paws", seems to be prone to allergies and have a tendency to itchy skin. When I first got him, the vet diagnosed him with a flea allergy, and an infection where he was scratching. We treated that, and I give my cats flea treatments regularly even though they are indoor cats. He also had a slight problem with flatulence, but I switched him to a food for cats with allergies or sensitive stomachs, and that's gone now.
So Prof. Paws' health is good, but he still scratches a little bit more often than is normal. It's a mild problem, one that a human could probably solve with an occasional oatmeal bath (but a cat would not appreciate that!). There are loads of nutritional supplements for cats that claim to improve skin condition; what ingredients should I look for to help with itching?