Are jitters good or bad?

Okay, so I started Green Stinger 4 days ago. The first two days I had really terrible stomach aches and jitters. The third day I had less jitters and only a mild stomach ache. Now, I have neither jitters or a stomach ache. I feel much better now that these are gone, but I'm wondering, is the ephedra still working even though I don't have a stomach ache or jitters?
REPLY

It has fake ephedra called Ephedra Extract.  Real ephedra, ma huang and sida cordifolia has Ephedrine Alkaloids.

Probably just the caffeine giving you these problems.  I had the same problem with Stimerex.