As someone who is sensitive to caffeine, I have to look elsewhere for supplements that give that little energy boost when the day gets the better of me. I have used a few different brands of cordyceps, and to be honest, I don't notice a whole lot of difference from one to another. I get a little smooth non jittery energy from all of them. What makes this brand my favorite is the value. I get consistent quality, and good price and good service from this brand. I use many of their supplements for that reason.