Dietary supplements do not guarantee safety just because they are Ephedra free. Obese suffering from heart diseases and diabetes, have to be very careful while switching over to an Ephedra free diet diet pills. Researchers at the University of California, San Francisco found that the two dietary supplements Advantra Z and Xenadrine EFX containing extracts of bitter orange triggered the heart rate of 10 healthy volunteers 6 hours after consuming the pills. Please don’t carried away by the tag ‘natural’, as herbal dietary supplement contain herbs and harmful extracts like caffeine which raises the blood pressure levels. So, guys if you are already suffering from a chronic disease don’t try to burden yourself with self-medication.