[quote=@RomanAria]
[@Earnest Evans] It's simple science. Oxygen binds to the iron in hemoglobin. Take the iron out and the blood can't hold any oxygen and the person will die of de-oxygenation.
[/quote]

Actually, I'm gonna end this discussion right now before I leave for class. Jaden would not be able to manipulate hemoglobin and this is my justification.

1. The ability just screams power abuse and could easily lead to godmodding.

2. The scientific explanation. Hemoglobin is not iron, not any more than water is hydrogen or oxygen. Hemoglobin is mostly proteins, specifically one called Heme. 
[url]http://upload.wikimedia.org/wikipedia/commons/b/be/Heme_b.svg[/url]

As you can see, heme is very much its own molecule, and is mostly nitrogen, oxygen and carbon. 

Ill elaborate later after class, but thats what ive got for now.