https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
The food I use has a vitamin coating (I think it's a coating) but I figure it loses strength over time...I wanted to supplement that. Like Larky, my two get less than the bag recommends. (Every dog I've had has needed less.)
I tried Fido-Vite because Pete raved about it...looked like good stuff....my pups didn't think so. (who can vomit the soonest after eating seemed to be a game for them)
In the past, I'd also tried Nupro (with the Akitas and three out of four Labs...fourth Lab wouldn't eat it).
I'm on the third container of the Pet MD and satisfied that it's doing something for the pups. At least they're not throwing up.... (common with Danny, especially...their nerves aren't the only sensitive things about them)