OK... so the well known fertilizer double salt known as MKP, or monopotassium phosphate, is 0-52-34.
https://en.m.wikipedia.org/wiki/Monopotassium_phosphate
So they dribble a tiny bit of 'B vitamin' and some food coloring in it and charge you HOW MUCH?!
For reference, I got a 50lb bag of Haifa brand MKP for $78.
Nothing wrong with using MKP as a bloom booster, that's what it's for. Just don't use very much; I use .25g/gallon of nutrient solution and it's plenty.
If more people in this industry would CRACK A FUCKING TEXTBOOK, a lot of these nutrient ripoff artists would go bankrupt like they belong!
Ever heard of MOAB- Mother Of All Blooms? 0-52-34... Gee- I wonder what's in it?!