My 15yo male cat, Tigger, was losing weight, looking sickly & was sneezing continuously a couple of months ago. I thought maybe it was his food (dry Purina). Started him on a good quality canned food with “meat” listed as the first ingredient. Saw some change in him for the better, but still sneezing quite a bit. A week ago, I started sprinkling a “small pinch” of flush Niacin on his food & mixed it in. He’s finicky, so I wasn’t sure he’d eat it. He did, and is doing much better. No sneezing in past 3 days! He’s even showing some interest in his toys again. 🐱 🤞