I don't know about reducing sperm count my i've heard from my different coaches and trainers that their really bad for you especially if you do sports. There are like a million chemicals in their and it makes you hear pump faster then normal i've heard. If you do drink them I wouldn't drink them often or if your doing alot of excercise

Energy drinks just have way too much sugar in them, and a really high level of caffeine that is unhealthy for your body.

yep, those 500ml probably have(no joke) like 200 grams of sugar, a grown adult should only consume 90 grams of sugar per day, not to mention the caffeine... plus, they don't you give you energy, the pro athletes that drink it get paid to do so.

Its terrible for your heart, not to mention your teeth and all the sugar.

I drank 3 red bulls in a row once and thought I was gonna have a heart attack, That shits dangerous.