simple math my friend. say you have 2 bottles, 1 is 250mgs/ml and the other is 300mgs/ml you just figure out how much of each you need to do 600mgs a week or whatever you want to take. obviously you take 2cc's of the 300mgs/ml to get your 600 of the one and you take a little less then 2.5cc's of the other. you can also do 1cc of each per week if you have the same amount of bottles. for example you can take 1cc of your 300mgs/ml on sunday and 1cc of your 250mgs/ml on wednesday