3rd year using MultiMin, first year using it 30-40 days pre breeding. Have my fingers crossed that it helps improve heats and conception. I also use Vitaferm Concept Aide, have been for years as well, but I started them on it earlier than usual. I'll let you know how I think it works. Up to this point I don't think it works.
I have only used it once on a new born, and it seemed to perk him up pretty quick.