drops = ?mg

I am sure this information is somewhere here, but I have searched and searched and read and read and can't find it.

I have been reading (lurking - LOL!) for some time and and I now up to 16 drops daily of Lugol's.  I take that twice a day, but as I increase, I will add a third time.

How do I know how much Lugol's (in mg's) I am taking?  How much does one drop equal?

I know we must listen to our bodies and daily amounts vary greatly from one to another, but how will I know when I am taking too much?  I have no major detoxing; only some very minor stuff like my nose is stuffy immediately after dosing, but it doesn't last long.  When I have painted, it is gone is a couple of hours.  My body seems to love this stuff; I even enjoy the taste in water. 

Can I assume that until I have some "real" detoxing, I have not reached my limit?

Thank ALL OF YOU for your incredile contributions.  You are helping many people.

 Dianna