@Athan1982 some of those I have used personally like terpinator and purpinator and they work well, but you can accomplish the same thing organically without directly feeding the roots.
Those supplements are pretty much just naturally derived potassium supplements with sulfates in them and other compounds that you can easily accomplish organically yourself using other products.
For instance my mix gets plants crazy purple and increases terpene profiles just as good but costs me less over time even though the initial investment in products is more. I can mix enough with what I get to go through a few gallons of purpinator or terpinator and save a few hundred in the process.
Liquid kelp, unsulfured black strap molasses, cal mag, micro nutrient booster that includes sulfur, and mix in a bat guano tea for nitrogen phosphates and potassium sulfates/sulphates. This is my veg recipe.
Flower recipe I ditch the bat guano and use green sand, kelp meal, granite meal, and fish bone meal along with the liquid kelp and molasses.