I am 17 and have just bought the andro bulking kit. what are some of the irreversible potential long-term effects of taking a supplement like this?

It's safe: These are weak prohormones. You won't injure yourself. If you do notice it is affecting your mood, getting you excited, or making your testicles smaller, stop. I am glad you are working out, remember that most women prefer trim and ripped to bulky. Every guy I know who has done hard anabolic steroids has told me they regretted it. This is a better choice.