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Cheapest Iron (naturally occurring) on iHerb

Ranked by real cost per 100 mcg of Iron (naturally occurring) — cheapest value first.

Prices updated Jul 25, 2026 · 25 products · Prices in USD

The priciest option here costs about 4,656.5× more per 100 mcg of Iron (naturally occurring) than the best-value pick Source Naturals. For the same daily dose, choosing by cost per unit instead of sticker price can meaningfully cut your yearly spend.
#ProductDoseServingsPrice (USD)Cost per 100 mcg
1
Source Naturals, Spirulina, 500 Tablets
Source Naturals, Spirulina, 500 Tablets
Source Naturals
850 mcg8323.140.033View on iHerb →
2
Source Naturals, Spirulina, 200 Tablets
Source Naturals, Spirulina, 200 Tablets
Source Naturals
850 mcg3310.050.036View on iHerb →
3
Source Naturals, Yaeyama Chlorella®, 4 oz (113.4 g)
Source Naturals, Yaeyama Chlorella®, 4 oz (113.4 g)
Source Naturals
4 mg379.696.55View on iHerb →
4
Source Naturals, Yaeyama Chlorella®, 8 oz (226.8 g)
Source Naturals, Yaeyama Chlorella®, 8 oz (226.8 g)
Source Naturals
4 mg7524.338.11View on iHerb →
5
Source Naturals, Yaeyama Chlorella®, 300 Tablets (20 mg per Tablet)
Source Naturals, Yaeyama Chlorella®, 300 Tablets (20 mg per Tablet)
Source Naturals
2 mg308.2715.31View on iHerb →
6
Planetary Herbals, Triphala Powder, 16 oz (454 g)
Planetary Herbals, Triphala Powder, 16 oz (454 g)
Planetary Herbals
1 mg16218.7416.29View on iHerb →
7
Source Naturals, Chlorella, 200 Tablets
Source Naturals, Chlorella, 200 Tablets
Source Naturals
2 mg5016.6018.44View on iHerb →
8
Source Naturals, Yaeyama Chlorella®, 600 Tablets, (20 mg per Tablet)
Source Naturals, Yaeyama Chlorella®, 600 Tablets, (20 mg per Tablet)
Source Naturals
2 mg6020.9919.44View on iHerb →
9
Source Naturals, Chlorella, 500 mg, 100 Tablets
Source Naturals, Chlorella, 500 mg, 100 Tablets
Source Naturals
2 mg258.8919.76View on iHerb →
10
Planetary Herbals, Triphala Gold®, 120 Capsules
Planetary Herbals, Triphala Gold®, 120 Capsules
Planetary Herbals
1 mg6013.4022.33View on iHerb →
11
Planetary Herbals, Triphala Gold®, 60 Capsules
Planetary Herbals, Triphala Gold®, 60 Capsules
Planetary Herbals
1 mg307.3624.53View on iHerb →
12
Planetary Herbals, Triphala, 180 Capsules (500 mg per Capsule)
Planetary Herbals, Triphala, 180 Capsules (500 mg per Capsule)
Planetary Herbals
1 mg4519.4430.86View on iHerb →
13
Nordic Naturals, Magnesium Complex, 90 Capsules
Nordic Naturals, Magnesium Complex, 90 Capsules
Nordic Naturals
2 mg3018.6632.74View on iHerb →
14
Garden of Life, Raw Organic Fit, High Protein for Weight Loss, Vanilla, 2 lbs 0.8 oz (930 g)
Garden of Life, Raw Organic Fit, High Protein for Weight Loss, Vanilla, 2 lbs 0.8 oz (930 g)
Garden of Life
3 mg2046.1976.98View on iHerb →
15
Garden of Life, RAW Organic Fit, High Protein for Weight Loss, Original, 1 lbs 15.39 oz (890 g)
Garden of Life, RAW Organic Fit, High Protein for Weight Loss, Original, 1 lbs 15.39 oz (890 g)
Garden of Life
3 mg2046.1976.98View on iHerb →
16
Garden of Life, Raw Organic Fit, High Protein for Weight Loss, Chocolate, 2 lbs 0.09 oz (910 g)
Garden of Life, Raw Organic Fit, High Protein for Weight Loss, Chocolate, 2 lbs 0.09 oz (910 g)
Garden of Life
3 mg2046.1976.98View on iHerb →
17
Source Naturals, L-Tryptophan, 120 Tablets
Source Naturals, L-Tryptophan, 120 Tablets
Source Naturals
1 mg4021.8190.88View on iHerb →
18
Source Naturals, L-Tryptophan With Coenzyme B-6, 120 Tablets
Source Naturals, L-Tryptophan With Coenzyme B-6, 120 Tablets
Source Naturals
1 mg4021.9791.54View on iHerb →
19
Source Naturals, L-Tryptophan, 90 Tablets
Source Naturals, L-Tryptophan, 90 Tablets
Source Naturals
1 mg4536.73102.03View on iHerb →
20
Source Naturals, L-Tryptophan with Coenzyme B-6, 60 Tablets
Source Naturals, L-Tryptophan with Coenzyme B-6, 60 Tablets
Source Naturals
1 mg2012.42103.50View on iHerb →
21
Source Naturals, L-Tryptophan, 60 Tablets
Source Naturals, L-Tryptophan, 60 Tablets
Source Naturals
1 mg2012.42103.50View on iHerb →
22
Source Naturals, FOS, 100 Tablets
Source Naturals, FOS, 100 Tablets
Source Naturals
1 mg2513.76110.08View on iHerb →
23
Nordic Naturals, Men's Multivitamin, 60 Tablets
Nordic Naturals, Men's Multivitamin, 60 Tablets
Nordic Naturals
1 mg3039.91133.03View on iHerb →
24
Metabolic Maintenance, Metabolic Detox Complete, Natural Chocolate, 2.3 lb (1.05 kg)
Metabolic Maintenance, Metabolic Detox Complete, Natural Chocolate, 2.3 lb (1.05 kg)
Metabolic Maintenance
3 mg2184.00133.33View on iHerb →
25
Nordic Naturals, Men's Multivitamin, One Daily, 30 Tablets
Nordic Naturals, Men's Multivitamin, One Daily, 30 Tablets
Nordic Naturals
1 mg3022.91152.73View on iHerb →

How we rank Iron (naturally occurring)

Two supplements can list the same dose per serving yet cost very differently once you account for how many servings are in the bottle. We calculate the total nutrient in each container (dose per serving × servings per container), divide the current price by that total, and rank by the resulting cost per unit. Lower is better. Because prices are refreshed automatically, this ranking reflects today's iHerb pricing rather than a snapshot from months ago.

Cost per unit is a starting point, not the whole story — the ideal form, third-party testing, and other ingredients matter too. Always check the label and consult a healthcare professional before starting a supplement.

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Prices update automatically and may differ from iHerb at checkout. Rankings are based on cost per unit of the listed nutrient and are for informational purposes only — not medical advice. Links to iHerb are affiliate links.