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If you just want productivity, stick with normal amphetamines in my opinion. I've mainly just snorted meth, and have never taken any orally, so I can't speak to differences in onset related to that route. If it's very clean/pure, it can be both intense, and keep you awake for a long time, so be careful with dosing. Personally, I found it easy to spiral into cycles of continued use for a week at a time, which doesn't really have great effects on your life. Stay safe, and good luck.