Im a newb and wondering if recrystalization effects the yield.    I don't want to poison my friends but at the same time i'd like to have a good yield. Talkin about mdma crystals. Would be greatful if any one with experience would reply.

I have no experience with it, but I can say that the yield of pure substance will be smaller when reXtalization is done; the overall yield stays almost the same (almost always some small mechanical losses will occur). But after a recrystallization, you have a smaller than original amount of clean MDMA.HCl and a small portion of impure MDMA.HCl, dirtier than before. But you can always recrystallize this small crappy amount again, and then again... until it isn't worth the work and solvents anymore.


_{indole_amine}

affects, NOT effects

the former is a verb, the latter is a noun.

Thanks Bond_DoubleBond for giving me a good chuckle here.  My sentiments exactly.
 In response to spunky366, if you've been conscientious about your procedure throughout the synthesis (doing the necessary A/B and final vacuum distillation of the freebase, etc.) recrystallization really is not necessary.
  Although it is always fun.

Effect is a transitive verb too, look it up in a dictionary...yield is the direct object, so it's being used correctly there.

For the record, I am a fully accredited professional grammar nazi, with all rights and privileges granted as such.

I was under the impression it comes down to how pure the product initially was as to how much it will effect yield