I had some Maen Da red, some other red and green types, some "yellow" type. TBH I didn't notice much of a difference between them. Red was supposed to be good for sleep, green for energy, but it feels all the same to me 
I've heard a lot of people say there really isn't much difference, yet others swear they are very different.
I'll try some green. There is a place here that has like 5-6 different kinds.
My GF took a teaspoon of Red Vein and slept for like 10 hours.
