Different bodies react differently to caffeine ... Those who get side effects from consuming fat burners are overdosing caffeine already ... causing them to have headache ... I personally had insomnia after consuming too much fat burners that I reduced my consumption.

So it should be okay until you get side effects from consuming fat burners and other stuff that contains caffeine.

Usually I only take fat burners when I want to look "tight" ... Normal days just keep the fat la unless at least you get some metabolism from it