Does it contain anything else? What are the inactive ingredients?
OK, here's what it sais on my package.
Active ingredient -Magnesium citrate: 1.745 g per fl. oz. magnesium content 290 mg per 1 fl oz
When I was taking 2 fl. oz That would translate to: 3.49 g magnesium citrate or 580 mg magnesium.
When I was taking 2.5 oz That would translate to: 4.3625g magnesium citrate or 725 mg magnesium
I think what your package refers to when saying each dose contains 100 mg is magnesium (rather than magnesuim citrate), because the RDA for magnesium is 300 mg (and 100 is 33% of 300)
Thus, I'd say what I was taking would translate as follows:
When I was taking 2 fl oz you would take 5.8 doses (580 mg), and when I was taking 2.5 fl. oz you would take 7.25 doses (725 mg). Round those to 6 and 7 doses and you are good.
That, however, you can do if you are certain the other ingredients aren't something that could bother you in large quantities. So please make sure about that. YOu can also list them here so we can help (if we can)