My gelding has a smartpak. It's super convenient and it allows me to change his supplement depending on the month and his weight, easily. I know people who do tubs, but I Herbie changes depending on season so it's just easier to have smartpak do it for me. I do buy Black as Knight
separately so that I can take him off a few weeks before I show.
Right now he is on: SmartCalm Ultra Cosequin SP TractGard Cocosoya Ultra SP
Next month he comes off Cocosoya.