Perhaps? It depends on what you are feeding *like, rolled oats, or COB feed...etc, etc* - and what else your horse is getting. Pasture, Good quality hay...If your horse is getting a fortified feed.....hmmm...maybe 3lbs a day isn't enough?
Maybe adding a scoop a day of a vit/min could help - but I would definitely discuss this with your Vet, or even call Smartpak and ask them. I like the fact that they don't push anything on you.
When I called them, they asked me what Nelson is eating - and I told them he is on full turn out, getting 24/7 access to Grass Mixed Hay, and he is getting 8lbs a day of ProAdvantage Grass Formula ProAdvantage Hi-Fat Formula
And they told me he doesn't need any type of vit/min addition.