I have not had any skin issues, goopy eyes, nothing since switching to grostong although I did before hand. According to the gauranted anyalysis it has 300,000 IU/lb vs 80,000 vitamin A with the 12/12. It seems to be the most "densely packed" supplement I have been able to find.
I did have my hay and pasture tested first just to be sure our forage was not unusually high in anything before I added supplements to it. It can help a bunch when making a feeding plan and it's free at the local ag extension service which is always a plus.
That's good info on the soybeans! Thanks for sharing that.