Im not finding anything, i could be wrong, just sure it came up in conversations with nutrient reps, and grow shop gurus as an additive in many of the top shelf root nutes.. but if you using humic acids you've got nothing to worry about. h&g makes roots accelerator, awesome root additive, does amazing things. its synthetic though so i no longer use it. but when i was on the line it was great. its expensive. but if you call the distributor, tell them you "have been loyal to advance for years however your no longer happy due to the breakdown and frequent changes to the line.. your interested in trying their line, but are put off by the prices.. inquire if they have any samples so you could run a trial and see if you want to switch.." they will ask you a few questions about your grow, ie your grow media, your city/state, and they will give you a couple of stores to choose from that will call you when they receive their next order. it will be a box with full liter size bottles of everything and you need for a full run. free try if you like then you buy, its a great idea for marketing, and they jump at any opportunity to steal customers from advanced. happy hunting!