I was seeking answers...and noted that you can find the drowsiness comments in other postings on this and other forums.....
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I've never had any problem with it. I always take a full scoop in the evening as I'm leaving work, so I can focus and stay awake during class.
I'm pushing 50 and find my gastro-intest system more and more sensitive to stimulants like what's inand, sadly - coffee.