The information below has now been put into a PDF document that you can download.
҉ helvella ɐllǝʌlǝɥ ҉ helvella ɐllǝʌlǝɥ ҉ helvella ɐllǝʌlǝɥ ҉ helvella ɐllǝʌlǝɥ ҉
In general there are three forms of iron supplement -
• The simple substances like ferrous sulphate through ferrous fumarate, ferrous bisglycinate, and so on
• Various forms of haem iron (also spelled heme)
The simple substances do vary with the more complex molecules often being regarded as being gentler and less constipating than the basic - that is, bisglycinate is usually preferred to sulphate.
Haem iron and ferritin both wrap the iron up in more complex molecules and they have much less impact on the gut.
Haem and ferritin will be more expensive than the cheapest supplements but compared to some, such as Floradix, they are not particularly expensive. Don't forget that black pudding is still available as a good dietary source!
Simple supplements, haem and ferritin are each absorbed by different mechanisms. These three mechanisms appears not to interfere with each other at ordinary dose levels.
As I do not need to take iron, this is all based on reading and not personal experience.
Haem - iherb.com/search?kw=heme#p=1
Ferritin - iherb.com/search?sug=ferrit...
Results may vary over time.
A snippet about why ferritin might be particularly important:
Ferritin iron is absorbed by a different mechanism than iron salts/chelates or heme iron. Recognition of a second, nonheme iron absorption process, ferritin endocytosis, emphasizes the need for more mechanistic studies on ferritin iron absorption and highlights the potential of ferritin present in foods such as legumes to contribute to solutions for global iron deficiency.