In the case of Superthrive, they have apparently changed the formulation, as it used to have NAA on the label. Vitamin B1 is also a root growth stimulant, but not a particularly good one.
Many moons ago, I did an experiment in which I intentionally overdosed the auxins, and all of my phal blossoms were deformed. The next time they bloomed after I ceased that experiment, they were all fine.
Manu - you can get KelpMax from C & C Orchids in Hamilton ON.