At this point, your recovery capacity should be at a high level, and there’s simply no need to use compounds that increase IGF-1 in one way or another. Accordingly, if your body doesn’t need it, you won’t get any additional benefits from it. I wouldn’t recommend adding or using anything at all right now. A much more professional approach would be to dive deeper into the training process and learn how different details affect your body.
You know how you can fairly easily tell a truly experienced athlete, whether amateur or professional, from a beginner? And I don’t mean someone who has only been going to the gym for a couple of months. I mean someone who is a beginner by nature. They can go to the gym for years and still behave like a beginner. The thing is, a beginner doesn’t go into the details, and because of that, everything they do immediately shows it.
What I would advise you to do is stop being a beginner and understand the aspects that matter most at this stage and can give you the biggest return — namely, training. This will give you a huge foundation for understanding how to develop your body.
Supplements and PEDs aren’t what should create progress. They’re there to help progress when your limits have been reached. And if you haven’t reached your limits, it only means one thing — you don’t know yourself and what you’re doing well enough yet.
Do you understand what I mean? Three sets of 8–12 reps sounds too superficial. There should be much more depth behind all of this.
You asked what you should take and how, but I would look at things more broadly. Why? Because at this stage, it really doesn’t matter whether you use IGF-1, something else, or nothing at all.