i think i see what you are asking. look at the concentration, it should be listed on the bottle or on the website. For instance, Liqua-Soutions sells Liqua-Nolva at 20mg/mL. If you wanted only 10mg of Liqua-Nolva for your expirement, then you would only use .5mL. If you wanted to use 20mg, than use one full mL