Sodium feredetate breaks down within the gastrointestinal tract to release iron, which is then absorbed. The ascorbate in Ferrous Ascorbate helps retardation or prevention of Fe(II) oxidation by ascorbate and to the existence of Fe(II) as a chelate with ascorbate ( vitamin C if you like ). Ferrous Ascrorbate will have a better bioavailability but you can add a vitamin C and vitamins B complex with sodium feredetate and have pretty good results.
Depending on your needs; are you lacking iron? anemia? if yes then my suggestion would be to take sodium feredetate and to help the iron absorption you should take a good vitamin C ( 1,000mg ) this good vitamin C can be bough at your local food supplement store. Also consider buying a vitamin B complex ( it is critical you get a good vitamin B complex from the food supplement store ) which also helps the absorption of iron and general increase in your metabolism functions and cells and in your case we are interested in red blood cells that help prevent anemia which can be increased with vitamins B. Also avoid excesses of zinc,calcium, cadmium, nickel, magnesium, chromium, phosphorus and manganese.
I agree with the first point you said.The bioavailability of ferrous ascorbate is close to 97%.Which is one of the highest level.The next point as you said in case of sodium feredetate ,(i.e.) added dose of Vitamin c tablets can be helpful.but unfortunately most of V-C tablets available in our market is formulated by (major proportion )Sodium ascorbate and(small proportion ascorbic acid). In iron transfer from Stomache wall ,sodium ascorbate will hardly contribute as it is in the neutralised salt form and that too with strongly associated with sodium.This bond will only break in acidic pH. i fully agree with B-complex idea .
And at the same time additional trace mineral like Zinc ,calcium and chromium should not be taken while taking iron preparation.They tend to slowdown iron absorption.
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