PlainVitamins

Synergistic Iron 25 mg

by Quest · capsule · 60 vegetable capsules

  • Off the market since October 2023 (NIH)
  • UPC 0 58371 22016 9
  • DSLD label 23707
  • Serving 1 capsule

Synergistic Iron 25 mg by Quest lists 12 ingredients, 12 with an amount per serving of 1 capsule, such as 25 mg of iron, 100 mg of vitamin C, 5 mg of thiamine and 2 mg of riboflavin. Its current label entered the NIH Dietary Supplement Label Database on July 25, 2013.

What is in Synergistic Iron 25 mg?

Each row as the label prints it, per serving of 1 capsule. 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).

Synergistic Iron 25 mg: Supplement Facts rows against the market (DSLD label 23707, January 2026 release)
IngredientAmount% DVAmong products listing it
Ironas {iron} HVP chelate25 mg139%*Iron in Synergistic Iron 25 mg against 6,910 products25 mg per serving; the middle half of products list 1.2 mg to 18 mg, the median 5 mg.DV 18 mgUL 45 mg25 mg

Higher than 87% of 6,910 products listing iron (median 5 mg).

Vitamin Cas Ascorbic Acid100 mg111%*Vitamin C in Synergistic Iron 25 mg against 18,583 products100 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg100 mg

50% of 18,583 products listing vitamin C give more (median 100 mg).

Thiamineas Thiamine Hydrochloride5 mg417%*Thiamin in Synergistic Iron 25 mg against 9,830 products5 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg5 mg

46% of 9,830 products listing thiamin give more (median 5 mg).

Riboflavin2 mg154%*Riboflavin in Synergistic Iron 25 mg against 9,824 products2 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg2 mg

60% of 9,824 products listing riboflavin give more (median 4 mg).

Niacin10 mg63%*Niacin in Synergistic Iron 25 mg against 12,413 products10 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg10 mg

77% of 12,413 products listing niacin give more (median 20 mg).

Pantothenic Acidas Calcium D-Pantothenate10 mg200%*Pantothenic Acid (Vitamin B5) in Synergistic Iron 25 mg against 10,060 products10 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg10 mg

52% of 10,060 products listing pantothenic acid (vitamin B5) give more (median 12 mg).

Vitamin B6as Pyridoxine Hydrochloride5 mg294%*Vitamin B6 in Synergistic Iron 25 mg against 15,277 products5 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg5 mg

51% of 15,277 products listing vitamin B6 give more (median 6 mg).

Copperas {copper} HVP chelate2,000 mcg222%*Copper in Synergistic Iron 25 mg against 6,468 products2 mg per serving; the middle half of products list 0.5 mg to 2 mg, the median 1 mg.DV 0.9 mgUL 10 mg2 mg

Higher than 66% of 6,468 products listing copper (median 1 mg).

Vitamin B12as Cyanocobalamin20 mcg833%*Vitamin B12 in Synergistic Iron 25 mg against 14,425 products20 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg20 mcg

59% of 14,425 products listing vitamin B12 give more (median 36 mcg).

Folateas Folic Acid200 mcgFolate in Synergistic Iron 25 mg against 7,022 products200 mcg per serving; the middle half of products list 200 mcg to 400 mcg, the median 400 mcg.200 mcg

71% of 7,022 products listing folate give more (median 400 mcg).

Biotin50 mcg167%*Biotin in Synergistic Iron 25 mg against 9,447 products50 mcg per serving; the middle half of products list 50 mcg to 300 mcg, the median 200 mcg.DV 30 mcg50 mcg

73% of 9,447 products listing biotin give more (median 200 mcg).

Molybdenumas {molybdenum} HVP chelate50 mcg111%*Molybdenum in Synergistic Iron 25 mg against 4,390 products50 mcg per serving; the middle half of products list 25 mcg to 75 mcg, the median 50 mcg.DV 45 mcgUL 2,000 mcg50 mcg

41% of 4,390 products listing molybdenum give more (median 50 mcg).

* % Daily Value computed from the printed amount and the FDA Daily Value (21 CFR 101.9); the label prints none for that row.

Source: NIH ODS Dietary Supplement Label Database, label 23707 (entered July 25, 2013), 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?

Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.

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?

The products whose ingredient lists overlap most with Synergistic Iron 25 mg's, rare ingredients counting for more.

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
Recommended Use: Helps to prevent iron deficiency. A factor in the maintenance of good health. Recommended Dose (Adults): Take 1 capsule daily with a meal. Take a few hours before or after taking medication.
Warnings
Risk Information: For adult use only.
KEEP OUT OF REACH OF CHILDREN.
DO NOT USE IF SEAL UNDER CAP IS BROKEN.
Warning: There is enough iron in this package to seriously harm a child.
Allergens and what it does not contain
This product does not contain dairy, egg, gluten, lactose, shellfish, soy, starch, sulfites or yeast.
No artificial colours, flavours or preservatives
Storage
STORE IN A COOL, DRY PLACE.

Source: label statements in DSLD label 23707.

What else is on the label?

Other ingredients: Microcrystalline Cellulose, Magnesium Stearate, Cellulose.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): PREMIUM - QUALITY ASSURED; {Recycle}; SunOpta A healthy products company.

How many labels does Synergistic Iron 25 mg have?

One label is on file, entered on July 25, 2013.

  1. Label 23707 (current) Entered July 25, 2013 · off the market October 12, 2023 · 60 vegetable capsules · UPC 0 58371 22016 9

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names SunOpta Inc. (manufacturer), Acton, ON. All Quest products.

Where next?