Bests & Worsts Reviews from Amazon

I always lack energy due to me not getting sufficient sleep. I would take coffee and it would wake me up but it would give me anxiety. I heard the combination of l-theanine and caffeine was great because of its ability to remove the negative side effects of caffeine. I took one today since I only got 4 hours of sleep and within 30 minutes I was already feeling the effects. I was awake completely in 1 hour and had no anxiety from the caffeine.