Stacker2 is no different than all the other thermogenics. It just contains Mahuang, willow, chromium, and kola nut. This is the weak herbal substitute for the ephedrine, caffeine, aspirin stack. Headaches are possible side-effects of ephedrine(MaHuang, Ephedra, etc) Side-effects should lessen as you continue to take Stacker or any burner. Your system will adapt to it. Try it with food, or water.
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