Gave this a whirl. I only take one about 30 minutes before a workout. It does give me the mental focus and energy I need to push myself through my workout, and my day. Hunger cravings seem to be alleviated. I am sensitive to thermogenic products, but this has not affected me in a negative way. Definitely impressed!
It's just caffeine. Nothing special about it that makes it worth spending on. Regret purchasing it to be honest. Save your money to buy more nutrient dense food instead that support and sustain your energy levels.