It’s a pretty well known (and govt tested) supplement to do 2:1 ratio of L-Theanine to Caffeine if you want some sharpness.
They’re both water soluble too so if you wanna get real crack headed about it, you can separate out and mix energy drink mixes for yourself. You can get citric acid from the store or use natural sweeteners (go easy on these, probs not that good for us anyway, you’ll get used to the flavor of “watered down” soon anyway)