You can take it pre-workout. Like others said the Agmatine Sulfate wiull def help with pumps, Pre-workout on workout days and in the morning on rest days is common & how I dose myself.
Stacking with AP would be great for adding size, help you utilize the carbs the way theyre supposed to be handled! Prime or Versa-1 would be a solid addition as strength and size are reported (and ive experienced) with both!
The possibilities are almost endless, a very versatile product. TestPowder has AI & Prolactin control so if you feel the need to stack with a compound like Erase, the dose should be smaller. Dont want to dry out the joints!