hmmm, i can't help but wonder if dxm at such high levels would have adverse reactions to nootropics such as Dimethylaminoethanol, especially since amounts like 500-750mg out of what i have read may cause anxiety and restlessness. i can't imagine some of the side effects to DMAE combined with the effects of DXM being that good on the body. honestly i don't see a problem with taking around 350mg or so. if a few more people come out saying that taking something like 500-750mg shouldn't be a problem, by all means i'll go for it.
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