10pts. vitamin support please??

How do you figure out the elemental amount of a vitamin, if it doesn't clearly state it on the bottle?
Answers:
What does it say on the bottle?

EDIT: Magnesium (as Magnesium Citrate) 400mg 100%
This means that within is 400mg of Magnesium which is 100% of the RDA. It is present as the citrate salt.

EDIT2: Yes, 400mg elemental Magnesium. Source(s): Pharmacist

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