6g I'm sure works. I poorly worded my first post--sorry about that. I should have said 10g is more like the optimal dose. This is where I got my info, from a Charles Poliquin Q&A:
Q: There's a lot of hoopla out there concerning the new supplement Beta Alanine. Is this stuff worth it?
A: I think Beta Alanine is great. It allows you to do more reps. I think it's most beneficial when you work in the 4-5RM range. If you're the type of guy who does ten sets of three (10 x 3), then it'll allow you to get that up to tens sets of four or five (10 x 4-5).
I've used it a lot in the last six months and my athletes are making much faster progress, especially at high doses. Up the dose until you get tingly, then back down a little. I think people should take 10 grams of it a day. Taking 3 grams a day is just far too small of a dose. That dose is like trying to fart against a hurricane.
TESTOSTERONE NATION - Questions of Strength: December
"I can say that a very select few coaches “in the know” have secretly suspected for awhile now has been only recently confirmed by science. They suspect that supplementation to increase muscular carnosine levels via beta alanine is FAR more effective when combined with creatine, over using beta alanine alone! (1) "
From his website.