Macro minerals are those required in terms of grams. For example, an 1100lb horse in light-mod work needs around 27-30gm of Ca. The macro minerals in the PP are present in amounts less than 1gm, with the exception of K which is 1.2gm. Meaning, the amounts are insignificant.
Trace minerals are those required in terms of milligrams. That same horse needs around 100mg of Cu and 400mg Zn. PP has 14mg and 120mg respectively. Those amounts are a little more significant, but not to any point of ODing
PP has .8mg Se, but on top of the 2mg in the CTP, it doesn’t bother me. For peace of mind, it might be a good idea to do a blood Se check a few months after making the change, just to be sure. I don’t know what the Se content of your hay is generally like. But 3mg on top of what’s in most hay isn’t usually a big deal.
The vitamins in the PP are fine on top of the CTP
The amino acids in PP are pretty insignificant, so no benefit provided there.
There’s really not a lot of most things in PP. I suspect most benefits are from the flax and fatty acid profile