It’s not going to work the way you want it to. What you really need to do is track your food. As meticulously as possible. Plan what you’re going to eat, meal prep it, always every day meet your goal. Even if you are forcing it down. Weigh yourself daily and chart your growth. If you don’t grow, eat more. Add another small meal daily until your weight chart starts climbing. Then stay there. If you can’t make this work, forcing it with a drug like that isn’t going to get you what you want. It’s like a genie in a lamp that plays tricks on you. Your wish is granted but “you didn’t want it like that”.
Mind you that growth occurs while you are sleeping, so if you aren’t getting good sleep you need to get that sorted out before anything else. Then you’ll have the basics down, and you’ll be maybe ready to use some things to take you beyond a level you could realistically achieve.
I’m assuming a lot here, because you haven’t said anything about your background. Have you followed any of the logs posted here? There’s some seriously big guys logging in this forum, I haven’t noticed any of them using igf, I believe that’s something you get into when you’ve taken everything else to its limit.
Do you have experience with PEDs? What’s your gym experience? I didn’t start really lifting weights until I was 40 years old. There’s every type of person logging on here. Maybe you will start one?