I took clen for about 2 weeks, 5 tabs a day and it made me only slightly learner. I kept my diet clean, but didnt alter it too much b/c i wanted to see how well clen worked. after 2 weeks, it did nothing for me. Its like i built up a tolenrance. i have tried taking it again with no luck. If you wanna get lean DIET and cardio. thats the only SURE way to get lean. might take a little longer, but whats 6 weeks of eating clean and doing a little cardio? EQ or Winny wouldnt hurt either