Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works okay, but wears off

I have low magnesium and have trouble absorbing it from pills. This powder was recommended. The first few times I took the normal dose, I felt instantly drowsy and relaxed. After the first week of taking it, the relaxed feeling stopped happening altogether. Also if I take it regularly I do get diarrhea.Not really sure if I should recommend it or not. Apparently it was doing something initially, but I don't feel the effects anymore. I was hoping that this would help me sleep and help calm my muscle spasms. Those benefits only lasted about 3 days, so probably won't re-purchase.I got raspberry lemon and the taste was fine.