To generalize, L-amphetamine is bad and you want d-amphetamine.
I wouldn't generalize like that, even though I prefer dex I still think there is some sort of benefit from l-amp as long as you don't take too high of doses. I dunno what it is and I don't even have an adderall script anymore cause I don't care, but it felt like it helped focus more than plain d-amp. Could just be placebo, but I haven't been able to find a definite answer for what all the effects of l-amp are and I personally wouldn't completely dismiss it. Just saying, you can't say for sure l-amp is all negative. When it comes to pure recreational value and whatnot then sure, it's probably worthless and just causes negative effects if anything. Also I will say I just don't like the adderall make up in general, not just the fact that it's levo and dextro.
And I believe adderall xr is mainly metabolized in 2 doses with half now and half later, but I could be wrong. I've always thought of it as just two IR doses.
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