NEW
🩸 Ferrous Sulfate
Ferrous Sulfate 325 mg Tablets, 1000 Count
Cost per serving
$0.01
1000 servings · ~1000-day supply
Moderate absorption
$14.51Price from Amazon.com
PHARBEST · Amazon.com 0
See the offer Best Iron for energy and fatigue
Iron deficiency is a genuine, common cause of fatigue — especially in menstruating or plant-based people. Below, the iron products people use ranked by real cost per dose. A value comparison, not medical advice.
Updated September 2026
What the evidence actually shows
Iron resolves fatigue ONLY when the fatigue is from iron deficiency. Supplementing when you are not low does nothing for energy and excess iron is harmful — confirm with a blood test first.
Commonly used: only if a test shows you are low.
How this list is built: these are iron products ranked by real cost per dose across our whole iron catalogue — not filtered or re-ordered by energy and fatigue. We don’t hold per-product evidence for a specific use, so we don’t pretend to rank for one. Products whose own label says they are for something else are left out.
Background on iron from the NIH Office of Dietary Supplements .
Ranked by cost per dose
NEW
🩸 Ferrous Sulfate
Carlyle Iron Ferrous Sulfate 325mg
Cost per serving
$0.02
400 servings · ~400-day supply
Moderate absorption
$8.99Price from Amazon.com
Carlyle · Amazon.com 0
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🩸 Ferrous Sulfate
Major Ferosul - Ferrous Sulfate 325mg Tablets with 65mg…
Cost per serving
$0.03
200 servings · ~200-day supply
Moderate absorption
$5.99Price from Amazon.com
MAJOR · Amazon.com 0
See the offer NEW
🩸 Ferrous Sulfate
Ferrous Sulfate 325mg Iron Supplement (2-Pack) | Iron Pills…
Cost per serving
$0.03
200 servings · ~200-day supply
Moderate absorption
$6.29Price from Amazon.com
Reliable-1 Laboratories · Amazon.com 0
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🩸 Ferrous Sulfate
MAJOR Ferosul - Ferrous Sulfate 325mg Tablets with 65mg…
Cost per serving
$0.03
300 servings · ~300-day supply
Moderate absorption
$9.47Price from Amazon.com
MAJOR · Amazon.com 0
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🩸 Ferrous Sulfate 3rd-party
Nature Made Iron 65 mg (325 mg Ferrous Sulfate) Tablets
Cost per serving
$0.04
180 servings · ~180-day supply
Moderate absorption
$7.06Price from Amazon.com
Nature Made · Amazon.com 0
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🩸 Ferrous Sulfate 3rd-party
Nature Made Iron 65 mg (from Ferrous Sulfate) Tablets for Red…
Cost per serving
$0.04
365 servings · ~365-day supply
Moderate absorption
$14.45Price from Amazon.com
Nature Made · Amazon.com 0
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🩸 Ferrous Sulfate
Heivy Ferrous Sulfate 325mg with Vitamin C 100mg
Cost per serving
$0.04
240 servings · ~240-day supply
Moderate absorption
$9.99Price from Amazon.com
Heivy · Amazon.com 0
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🩸 Ferrous Sulfate
Nature's Truth Iron Tablets | 65mg | 240 Count | 325mg Ferrous…
Cost per serving
$0.04
240 servings · ~240-day supply
Moderate absorption
$9.99Price from Amazon.com
Nature's Truth · Amazon.com 0
See the offer See the full ranking, benchmarks and lab-tested brands on best iron by cost per dose.
Frequently asked
Does iron help with energy and fatigue?+
Iron resolves fatigue ONLY when the fatigue is from iron deficiency. Supplementing when you are not low does nothing for energy and excess iron is harmful — confirm with a blood test first. This page ranks the products people take by real cost per dose; it does not claim a supplement treats or cures anything. Not medical advice — talk to a clinician about energy and fatigue.
Which iron is cheapest for energy and fatigue?+
As of September 2026, the best value we track is Ferrous Sulfate 325 mg Tablets, 1000 Count. The full ranking by cost per dose is above; Price ÷ servings ÷ dose — the number retailers rarely divide out.
How much iron for energy and fatigue?+
Commonly only if a test shows you are low. This is a general reference, not a prescription — confirm the right amount for you with a clinician. Not medical advice.