Growth hormone (aka somatotropin, aka STH), if you do not go into details, accelerates cell hyperplasia, i.e. forces them to actively share, increasing their number. STH itself does not have a carcinogenic effect, but in the presence of a malignant formation, it will accelerate its growth by accelerating the division of cancer cells. How to protect yourself? Pass a full examination of the whole body, take an analysis for tumor markers. If everything is clean, you can start prem. But is it necessary? I repeat once again: GR by itself does not cause cancer, but if present, it can significantly accelerate its development. And if I were you, I would be more worried about the pancreas. Growth hormone is an insulin antagonist, i.e. inhibits its production. If there is a predisposition to diabetes, then theoretically it can be earned. That is why experienced athletes, setting large dosages of GH, add insulin to it, if necessary. But insulin is already a separate story, by the way deadly. And still think, do you need it?
Growth hormone is not a carcinogen. But there are certainly risks. You get into the car and you run into risks. Here's how to protect yourself as much as possible from the risks of dying in a car? The answer is simple. Fasten seat belts and observe traffic rules. "Do what you must, and there be what will be." Riding a red light is an unnecessary risk. It won't kill by itself, but it will increase the chances.
So the answer to your question is this. To protect yourself from the risks associated with the use of GR is to follow the same rules in essence: to take it for medical reasons. If there are no such indications, this is your risk.
How to protect yourself when driving through an intersection at a red light?
PS: I looked at your tags, that's why I wrote it.