OK, on the liquid clen. I've never used more than .25ml. When starting out, I would recommend trying half of that in the dropper and see how you react. Ease into it like I said or you will hate it!
The site I gave you sells it in a 60ml bottle with the dropper. It states 200mcg/ml. So .25 would be 50mcg. The lowest mark on the dropper is .25ml. At the dose I take one bottle will last me a loooong time.
Regarding Clen....start out slow!!!! The stuff can make you feel a headache all day long and also feel like you have fever...or it did me anyways. I found the best way if you have a liquid is put your planned dose in a cup of water and drink it over the course of about an hour. Stop drinking it once you get the jitters. After you've done this a few days, you can take it all at once and it will minimize your misery.
The site I gave you sells it in a 60ml bottle with the dropper. It states 200mcg/ml. So .25 would be 50mcg. The lowest mark on the dropper is .25ml. At the dose I take one bottle will last me a loooong time.