They can be stacked. For dosing/timing, ALWAYS READ THE PRODUCT LABELS, because it is always mentioned there (there's never an excuse NOT to know)!
HGHup - 5 caps pre-bed
TestoPro- 2 caps first thing and 2 caps 6-8 hours post-Dose 1
You have no idea of the results? Why are you using them then? You should choose your supplements in line with your goals and needs, which means you should know about the supplements and how they work, etc.
For more information on both, review:
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~Team APPNUT