After many years of tea and coffee drinking, I've found that longjing green tea (dragonwell) purchased from a reputable source helps me focus longer without the

After many years of tea and coffee drinking, I've found that longjing green tea (dragonwell) purchased from a reputable source helps me focus longer without the experience of crashing from caffeine. Longjing has some caffeine but also a decent amount of theanine. I find my days more productive with a few cups of longjing than with coffee or black teas. Quality tea isn't cheap, but buying it in bulk remains cheaper than buying a cup of low quality stuff from the store every day. Give it a try!