It’s not “good for chubby ponies” any more, or less than the Brooks Enhancer which is also a ration balancer. It’s just a different balancer. I’m assuming your pony is small? How much does that 1.5c weigh? Most balancers are around 3c/lb, and according to Brooks Feeds, .9lb of the min for an 800lb horse, so I’m assuming yours weighs less. Those minimum weight recommendations are for the nutrition provided, for the age/weight/workload given
That being said I recently heard there is concern over iron levels in Gro 'N Win?
But you’re not concerned about the Fe in the Enhancer? They add iron, and odds are good their iron is relatively high as well.
What is your favourite ration balancer and why?
Triple Crown - lowest iron, and highest copper and zinc of almost any balancer out there. But if that’s not available I’d need to know what you can get.
Regardless though, nearly every diet benefits from having additional copper and zinc since forage is typically high in Fe, along with often low copper and zinc but at the very least low relative to that iron.
ALSO - if you use a balancer supplement instead for the vits/minerals what do you put it in?
Hay pellets, or handful of a textured feed works, especially if it’s soaked and well-mixed. These are typically called “forage balancers”.
If your pony is truly chubby, then I wouldn’t be feeding a ration balancer at all. BoyleHeightsKid listed great alternatives, and Mad Barn Amino Trace is a great CN option.