They should have it, but some chicken feed has a portion in it. Just not enough... and he's been feeding him peas from the looks of that one picture, which has niacin in them as well.
I may have gotten lucky, or that might be why speedy has a slight quake sometimes when she's standing to long - i couldn't afford the niacin <brewer's yeast> right away and didnt get it for her and fancy until they were 3 months old...