Hope this helps from another board
You need to understand that cc's and mg's have nothing to do with each other. Cc's (ml's) are a measurement of VOLUME. Mg's are a measure of CONCENTRATION. You MUST understand this first.
If you have a compound that is 50mg's per ml (cc) then 4 ml's of that compound would be 200mg's.
If you have a compound that is 300mg's per ml (cc)
then 2.5 ml's of that compound would be 750 mg's.