I keep a dropper bottle of canola oil in the fridge, and each of my two cats gets a bit of wet food in the morning (Royal Canin S/O, a vet food), and ONE drop each of the oil mixed in.

Results in several days!

Is your cat scratching a lot?

Also, my vet told me that the bit just in front of the tail - where you see a lot of the dandruff - is where cats have a hard time cleaning properly. So you will see more of it there.

What a beautiful cat - after his awful start, it's so good to know he feels secure and loved with you.