Gluconate is what is used in multi vitamins
such as the prenatals that I'm on and many others. I think that it is a much better form of iron reagarding the GI tract than the Ferris Sulfate form which is a very harsh form of iron. Ferrous forms are easily absorbed. I think that the standard Ferris Sulfate is 65 mgs of elemental iron in the 325mgs bottle. You said your new iron is 27mgs so there is a difference in the amount of iron that you are getting. If that is no concern to you then it's probably a good supplement for you.