1cc = Mg?

[cro]

i think the op must be overseas.

Google (or anyone with a 5th grade education) could have told you that a cubic centimeter (cc) is the same volume as 1 mililiter.
So you have 100mg in a cc or ml (1500mg total).

[Bonaparte]

i think the op must be overseas.

The rest of the world uses the metric system, and most countries have a far better public education system than the US. So that certainly wouldn't be an excuse, lol.