I take one 325mg tablet of Ferrous Sulfate daily with 500mg of vitamin C, 2 hours before eating breakfast. This brought my iron level into the low normal range, which my PCP said was OK. I just learned from my daughter, who had weight loss surgery, that this kind of supplement did not work for her. Her doctor recommended a supplement called Proferrin Forte, which she says makes iron more absorbable for people with shortened intestinal tracts. I know nothing more about this product, other than it is a bit pricey. Your doctor could give more information about it.