Some people are really injecting too much HGH. I know some people who inject 10 or 12 iu per day. Well, it is their choice. So far, they don't suffer from any negative effect yet. On the other hand, I have always been loyal to my 5 iu per day dose.
I am using 10 iu a day and I love my result. I can't say that you should go for a 10 iu since I don't know how much your body can handle. Just take it slowly. Don't surprise your body. Start with a small dose then increase it slowly. If you feel like your body can handle 10 iu a day and the result is great, then why not maintain this dose, right?
There are people who are even running 12 iu to 15 iu a day. Well, if their body can easily handle that dose, then there is no problem with that. After all, our bodies are different from one another.