Your gastric juices are going to demolish much of the content, as part of the normal digestive process. A lot of what you take in does not get as readily absorbed as you would think. Especially many vitamins and minerals, which people tend to shit out in whole form without ever really knowing it.
If you had THAT much iron in your diet, you'd be wheel barreling your cock around. That's the first place that gets the iron y'know.
