Hi Java...my Magnesium is Spring Valley also and it says to take three daily ...without mgs listed on the front of the bottle. If you look at the 'Supplement Facts' on the back of the label it will say 'amount per serving' and '% Daily Value'. Mine says '400 mgs per serving', which what you get in three tablelts. Mine has zinc also. I started at at one a day and worked myself up to the three tablets (400mgs) as it can cause diarrhea.
Donna