We can manufacture iron with vitamin C controlled release tablet, each tablet contains 50 mg iron and 200 mg vitamin C, and 50 mg iron come from 140mg Ferrous Sulfate, 60 tablet for each bottle, Tablets for a 60-day supply. Iron 50 mg plus vitmain C 200 mg time-release tablets use a special outer coating release technology to release small amounts of the active ingredientsin to a person's system over a long period of time. Our release time is designed as 12 to 24 in the body after swallowed.