What are the effects of anabolic steroids? How can you tell when someone at your gym is using such substances to gain muscle mass?

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What are the physical or mental affects of taking steroids? Are steroids always harmful to your body? What are the pros and cons of taking them? How can you tell when someone has been taking steroids?
What are the effects of anabolic steroids? How can you tell when someone at your gym is using such substances to gain muscle mass?
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