Is clenbuterol or clen safe to use? This is actually the number one question every consumer will ask before trying it as a supplement. When it comes to the possible side effects of taking this thermogenic stimulant, there is a vast amount of misinformation out there. Although positive effects such as weight loss and reduction of body fats without harming the muscles maybe experienced when using it, there’s a high chance of experiencing the negative side effects. Considering the millions of people who have already used this drug without experiencing any problems at all, there is a need of putting into perspective the risk of health issues of using clen.