This one is definitely a personal choice type of thing. I would personally do 3ius and no less than that, but like I said it's a personal choice. I'm sure plenty of guys would say 2ius is enough, and it might be, but like I said for me it would be 3ius min and I'd split it into 2 shots. If you've never done GH before then start with 2ius for a couple of weeks to get ur body used to the extra GH which will help limit any sides. Once you're comfortable then up it to 3ius. If it doesn't make you tired you could split the dosing 1.5ius in the morning, and the other 1.5 later in the day, or you could simply take the entire 3ius whenever you're comfortable doing it. Preferably not with a meal. Find what works best for you. Once again it comes down to personal choice do you want the extra GH response? Take 2 shots. If 2 shots is inconvenient then stick with 1 shot, but overall I think 3ius is a great number for what you're looking for.