10ius of slin will drop your blood sugar by 100 points? You'd be dead before that happens, unless, of course, you having a fasting blood sugar level of at least 175. But if that's the case then you have more problems than GH levels.
And it's just the opposite in the body's natural state. Insulin inhibits GH, not vice versa. That's why one shouldn't eat simple carbs, or carbs in general before going to sleep. This will raise blood sugar suppressing GH release.
Now if you are injecting GH, natural insulin production will increase depending on the blood sugar level. You can inject all the GH you want but it will not suppress insulin. If blood sugar is high insulin production will increase. Think about it. Can you survive with very low GH, or even none at all? Can you survive or even remain conscious with very low blood sugar? My natural baseline IGF level is at 53 ng/ml so I am producing very little GH at my age (61) but this has had zero effect on my fast blood sugar level which is well within the reference range.
How old are you? Unless you intend to compete and need to get to 275-300lbs, I wouldn't use it if you are under 30 or 35 years old. You will do fine with just gear. Remember, Arnold, Zane, Oliva, Nubret all got physiques without HGH.