Slow Release Iron
by 21st Century · tablet or pill · 60 tablets
- On the market (NIH)
- UPC 7 40985 27343 2
- DSLD label 258592
- Serving 1 tablet
- 60 servings
Slow Release Iron by 21st Century lists 2 ingredients, 2 with an amount per serving of 1 tablet, such as 31 mg of calcium and 45 mg of iron. Its current label entered the NIH Dietary Supplement Label Database on January 22, 2022.
What is in Slow Release Iron?
Each row as the label prints it, per serving of 1 tablet. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Calciumas Calcium CarbonateCalcium (Form: as Calcium Carbonate) | 31 mg | 2% | 84% of 17,831 products listing calcium give more (median 115 mg). |
| Ironas dried Ferrous SulfateIron (Form: as dried Ferrous Sulfate) | 45 mg | 250% | Higher than 97% of 6,910 products listing iron (median 5 mg). |
Source: NIH ODS Dietary Supplement Label Database, label 258592 (entered January 22, 2022), version 9.4.0. See the label on DSLD. Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.
Is that a lot?
The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:
- Its 45 mg of iron is higher than 97% of the 6,910 iron products that print an amount; 198 list more.
The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.
The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.
Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.
Which products have the closest formulas?
6 products list the very same ingredients; the nearest amounts come first.
- Ferrous SulfateReliable 1 Laboratories same ingredients
- Iron Chelate 25 mgNatural Factors same ingredients
- Ferrous Sulfate 325 mgReliable-1 Laboratories same ingredients
- Iron SulfateWindmill Natural Vitamins same ingredients
- IronSunshine Naturals same ingredients
- Ferrous Sulfate Iron 28 mgRexall same ingredients
Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.
What does the label say about taking it?
Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.
- Directions
- Directions: As a mineral supplement, adults take one (1) tablet daily with any meal or as directed by a healthcare provider. Do not exceed recommended dosage.
- Warnings
- Do not exceed recommended dosage.
- Warning: Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure.
- Stop use and contact a physician if adverse reactions occur.
- Keep out of reach of children.
- Do not use if product appears to be tampered with or seal is broken.
- Warning: Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of reach of children. In case of accidental overdose, call a doctor or Poison Control Center immediately.
- Allergens and what it does not contain
- No added yeast or artificial flavors.
- Gluten free
- Storage
- Store at room temperature.
Source: label statements in DSLD label 258592.
What else is on the label?
Other ingredients: Hydroxypropyl Methylcellulose, Cellulose, Stearic Acid, Contains <2% of.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Guaranteed quality Laboratory tested.
How many labels does Slow Release Iron have?
2 labels are on file under this name since September 24, 2019: other sizes, label designs and reformulations. The current one leads this page.
- Label 258592 (current) Entered January 22, 2022 · on the market · 60 tablets · UPC 7 40985 27343 2
- Label 207462 Entered September 24, 2019 · off the market August 6, 2021 · 60 tablets · UPC 7 40985 27343 2
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names 21st Century HealthCare, Inc. (manufacturer), Tempe, AZ. All 21st Century products.