How many licks would it take? Can the iron in bars even be processed by the body? Can you do this for other minerals?
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US RDA age 19+ is 8 mg / day. Maybe if the iron bar is really rusty. Or, pills are cents a day. OR you could eat breakfast cereal or liver, lentils or spinach, Popeye.
https://ods.od.nih.gov/factsheets/iron-HealthProfessional/#h2
Breakfast cereals made of liver and spinach feel like an unexplored market
