When your skin and the whites of your eyes start turning yellow, you better quit and see a doctor ASAP.
When all your hair falls out and you look like Mr. Clean, I think it would be wise to quit.
When your balls shrink so badly that they're inverted, it would be highly recommended to get off.
When your t!ts end up bigger than your girls t!ts, it's time to get off!
When the acne on your back (bacne) gets so bad that it looks like you have genital warts, get off.
-I hope this deters you enough to really start researching which steroid you want to run and think hard about it. Have a good cycle set-up and an even better PCT lined up. Good luck!