Within an hour or two of taking it I felt a little nauseous and also wired. i almost felt like i was buzzing. It felt very strong to me. However, I didn't get jittery like I have with coffee (I do not drink coffee for this reason, but I do drink 2 cups of black tea/day instead.). I had really good focus and motivation. I felt like it lasted ALL day and I admit I was worried about being able to go to sleep that night. It was hard to fall asleep- my Oura ring showed Latency at 39 min - the high...
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