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Conversely, whereas dextromethamphetamine and dextroamphetamine are relatively balanced releasers of dopamine and norepinephrine in vitro, levmetamfetamine is about 15- to 20-fold less potent in inducing dopamine release relative to norepinephrine release.[16][18][4][12][21] Moreover, whereas levoamphetamine is about 3- to 5-fold less potent in terms of dopamine release than dextroamphetamine in vivo, levmetamfetamine is dramatically less potent than dextromethamphetamine and substantially less potent than levoamphetamine in this regard.[20][19][22]

https://en.wikipedia.org/wiki/Levmetamfetamine

Варите короче амф, по идее рацемат амфа должен быть более приятным чем рацемат мета.