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The only downside is that the dosage per capsule is lower, so if you are seriously deficient, you’ll need to take a lot of pills. It’s in the chelated bisglycinate form, which means it’s great if normal iron supplements give you constipation, cramping, or stomach pain. Thorne Research is known for providing straightforward, no-nonsense supplements, and that’s exactly what they deliver with their iron supplement. You may find that your stomach handles this better than the ferrous sulfate in other brands.Īnother attractive aspect of Ferretts Iron Supplement is its lack of fillers and artificial coloring agents. While this is still a mineral salt form of iron, Ferretts provides ferrous fumarate instead of ferrous sulfate. Ferretts Iron Supplementįerretts Iron Supplement is a good choice if mainstream ferrous sulfate supplements are causing too many side effects for you. The only downside of Proferrin ES is that there is less research on its actual efficacy while all the biochemistry literature supports the claim of increased bioavailability of heme form iron, the actual clinical work is still being done.

It provides its iron in “heme” form, meaning its ability to be absorbed should be vastly greater than a mineral form iron supplement like ferrous sulfate. If you have chronically low iron that has not responded to other supplements, Proferrin ES is the way to go. Solgar’s bisglycinate iron should help avoid this.

Solgar’s iron supplement distinguishes itself by avoiding the common ferrous sulfate form you’ll find in many other iron supplements.įerrous sulfate is an inexpensive and effective form of iron, but many people find that it causes constipation, stomach cramping, or other gastrointestinal side effects.