Plant Growth Regulators

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I'm quite sure I have used them in the past. Unknowingly though. I believe all the dutch nutrients contained them. Otherwise why would my yields have been halved since they've moved to the US? I never noticed any decrease in potency when I suspected that I was using them. In fact I believe my potency was much better. If there is any decrease in potency, it's got to be very negligible. Beyond human detection.
 

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