Minerals
Ferrous Fumarate
An iron salt that carries more elemental iron per milligram than sulfate or gluconate. Effective for repletion, with gut side effects similar to the other ferrous salts.
Best for
More elemental iron per pill
Absorption
Moderate
Typical timing
With vitamin C; away from calcium, coffee, and tea
How to take Ferrous Fumarate
A typical dose of Iron: Only when deficient; commonly 18–65 mg elemental iron. Best timing: With vitamin C; away from calcium, coffee, and tea. The form you choose mainly affects absorption and how easily it sits with your stomach, not the overall dose.