My friend brough me back some clen from mexico right before he left to go back to school. I didnt get to talk to him about it considering i have never taken clen before. He gave it to me in a "multivitamin" container due to precautions with his family. I just know if they are a normal size and i should take one making my way up 7 or if they are stronger or weaker. They are a little bit smaller than a dime....white with nothing written on them. How can i find out the strength?