humans have a much higher tolerance for beta adrenoceptor agonists than most believe. even if the clen was severly overdosed it wouldnt cause any short term problems besides maybe some shakes and cold sweats.. but no sudden death illness type effects... nasser said palumbo used to use 1,000mcg to 2,000mcg during dieting...and that was along side 250-375mcg t3.. i know personally ive gone as high as 300mcg clen and i didnt get any sides