That stuff is very good, but it is not a fertiliser ..... So if you just add it without any reason there is no reason to see that it does anything ...
This stuff is good bringing you plant back to live if it is stressed and dying . It is simply stres relievent.
So let say, you had to flush yours plant because you have over feed it, this is very stressful to the plant and that's the situation when you should use it (plant will start showing signs of recovery like twice faster)... You cannot over do it , if you give too much of it to the plant, it just will just be waisted so the plant will be fine.
Like vitamin C in people,if you take too much of it you will just pee it out and it will go down the toilet that's it...