I want to workout twice today . Can I take beta alanine again having taken once already this morning?
If it's mixed with all kinds of crap including caffeine, I wouldn't chance it.
Apart from that, when I used it it was twice a day. And it was "pure".
Beta-alanine is a saturation type supplement like creatine. It does not matter when you take is as long as you get about 6g a day. So it's actually recommended to take it more than once a day since higher doses (especially 6g at once) can give you the tingling feeling.