The short answer · Hemoglobin
Take ferrous sulfate for hemoglobin. This is the one to buy.
21st Century, Iron, 65 mg, 120 Tablets
4.7· 25,024 ratings· $0.04/serving
Ferrous Sulfate 65 mg — inside the studied 65-200 mg window
Of 2,596 products scored for Hemoglobin, 21st Century, Iron, 65 mg, 120 Tablets ranks #1 with a DoseRank score of 87. Ferrous Sulfate is the strongest evidence signal for this outcome.
Retailer links may be affiliate links. Rankings and placement are never paid.
The form“Why Ferrous Sulfate — not Ferrous Bisglycinate?”Evidence Strong evidence
Ferrous Sulfate is the strongest evidence signal for this outcome.
- Ferrous SulfateThe pick
Strong evidence · 65 mg
The standard reference form for iron supplementation; high elemental iron content and low cost, but frequent constipation, nausea, and dark stools limit tolerability.
- Ferrous Bisglycinate
Strong evidence · 27 mg
Iron chelated to glycine; significantly better absorbed than sulfate with minimal constipation or nausea - the preferred form for sensitive individuals or maintenance dosing.
The dose“Is the dose actually effective?”Dose fit 67
Ferrous Sulfate at 65 mg lands inside the studied 65-200 mg window.
Ferrous Sulfate
Studied window 65-200 mg · this pick 65 mg
The ranking“Why should I trust this pick?”Trust 93
Strong trust signals — consistently high marks from verified buyer ratings. Each product gets a DoseRank score blending clinical strength, evidence, dose fit, trust and value. Retailer links may be affiliate links — the scoring model decides placement, never payment from a brand.
- 2,596 products scored
- Never paid placement
- Evidence level: Strong · 96
- 375 brands
- 8 ingredients
The price“Can I do better than $0.04 a serving?”Value 92
$0.04 per serving — low price tier for this outcome. Nothing else in this ranking costs less per serving.
Ready?
The #1 pick is $0.04 a serving.21st Century, Iron, 65 mg, 120 Tablets — in stock at a tracked retailer.
View on iHerbA saved, shareable breakdown: your matched products, dose math, and interaction flags to discuss with a clinician.
Or take the 60-sec quiz →Questions
Frequently asked
21st Century, Iron, 65 mg, 120 Tablets ranks #1 for Hemoglobin with a DoseRank score of 87. The score blends clinical strength, evidence, dose fit, trust signals and value across 2,596 products scored for this outcome.
Keep exploring