Personally, I've started drinking matcha and noticed an increase in energy. I can definitely tell the difference on the days that I don't drink it. I bought a tin of Do-Matcha brand and the little whisk etc. I might buy a less expensive grade to put in my morning smoothie to see if I get the same results. But I kind of like the peaceful experience of whisking and drinking from a special bowl. Anyway
I don't feel it right away, but I do notice an increase in energy and I feel more alert, and it lasts for several hours. I also get the added benefit of a massive dose of antioxidants since I'm consuming the whole leaf. Matcha contains about 130 times the antioxidants of a steeped green tea.
I'd much rather go this route than drinking an energy drink with questionable ingredients and side effects. I'm not referring to any specific product