Originally Posted by Nath

Hello mate, I have used grenades, they are basically a ECA stack, ephidrene, Asprin and caffiene. If ur after an ECA stack then there are probably cheaper and stronger alternatives, or u could make ur own with either Eph tabs or some the classic chesteze method which are available at most chemists. There are threads on here which detail some recomended doses.
I'm not sure on ur current fitness level, but be advised, it is not advisable to take ephidrene if u are ufit with high blood pressure. The 'thermogenic' effect caused by the stack can increase ur bp (I'm led to believe) so basically, approach with caution.

As far as their effectiveness, I personally think that they are very effective, they reduce ur appetite, give u loads of energy, a pre-workout buzz and they raise ur body temp so u are burning more calories than normal.

Another note of caution, prolonged use can diminish the thermogenic effect and they can become addictive.