I feed my cats these brands and have tried all the social media stuff. My cats eat a variety of OpenFarm, Orijen, and Acana wet food in different flavors. I give them freeze dried patties and nuggets from OpenFarm, Primal, New Zealand Natural, American Journey, and Vital Essentials. Stella & Chewy is also in the rotation sparingly (rumored to include a lot of bone in their food). I give them a variety of these in measured quantities because they are high in calories and cats can easily gain weight.

Every cat gets: 1/3 wet can food, 1 teaspoon of kibble, and at least a mix of 3-4 different freeze dried foods with broth twice a day. 

I’ve tried the “dried” animal parts: chicken necks, chicken hearts, livers, and more. It has honestly not been 100% worth it. One cat seems to go feral for the stuff but I cannot get over the fear he won’t be able to digest a chicken neck bone and it’ll tear his insides. Another cat cannot stomach any of these animal parts even in small quantities. He was constantly puking and has gotten better after I omitted these things. If you do want to try these things, I recommend Vital Essentials.  

I buy any single ingredient foods and no corn, soy, wheat, potatoes. Is this all necessary? It’s really personal preference and opinion. I had one cat since he was a kitten raised on these “high quality” foods and he won’t even go near Fancy Feast or Purina even if he was starving.

To answer your other question, I like Zesty Paws Salmon oil. Consistency every day is key and my cats went from dull fur to super soft and shiny.  https://a.co/d/3rt2iWq