Do you know what an AI is yet? Have you actually read it's definition, and what it does?
I'm sure there are some idiots who will tell you you don't need an AI at 500mg/week. They're wrong. You do need it.
The reason I asked you to use google was because you were asking questions about definitions of words, not advice relating to experiences. There is absolutely no reason to ask those types of questions. You can also read forums/threads that already exist, for that matter.