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Cheapest Magnesium (Citrate) on iHerb

Ranked by real cost per 1,000 mg of Magnesium (Citrate) — cheapest value first.

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

The priciest option here costs about 9.0× more per 1,000 mg of Magnesium (Citrate) than the best-value pick Nutricost. For the same daily dose, choosing by cost per unit instead of sticker price can meaningfully cut your yearly spend.
#ProductDoseServingsPrice (USD)Cost per 1,000 mg
1
Nutricost, Calcium Magnesium & Zinc with Vitamin D3, 24.4 oz (684 g)
Nutricost, Calcium Magnesium & Zinc with Vitamin D3, 24.4 oz (684 g)
Nutricost
420 mg602.000.079View on iHerb →
2
Vitamatic, Magnesium Citrate with B6, 180 Vegetarian Capsules
Vitamatic, Magnesium Citrate with B6, 180 Vegetarian Capsules
Vitamatic
500 mg1809.990.111View on iHerb →
3
Vitamatic, Magnesium Citrate Powder, 8.8 oz (250 g)
Vitamatic, Magnesium Citrate Powder, 8.8 oz (250 g)
Vitamatic
300 mg25014.990.200View on iHerb →
4
Micro Ingredients, Magnesium Citrate, Unflavored, 2 lb (907 g)
Micro Ingredients, Magnesium Citrate, Unflavored, 2 lb (907 g)
Micro Ingredients
500 mg27428.950.211View on iHerb →
5
Nature's Life, Renewing Magnesium, 500 mg, 100 Vegcaps
Nature's Life, Renewing Magnesium, 500 mg, 100 Vegcaps
Nature's Life
500 mg10011.490.230View on iHerb →
6
Nature's Life, Renewing Magnesium, 500 mg, 250 Capsules
Nature's Life, Renewing Magnesium, 500 mg, 250 Capsules
Nature's Life
500 mg25029.190.234View on iHerb →
7
Nutricost, Magnesium Citrate, Unflavored , 210 mg, 17.9 oz (500 g)
Nutricost, Magnesium Citrate, Unflavored , 210 mg, 17.9 oz (500 g)
Nutricost
210 mg31916.950.253View on iHerb →
8
Nature's Way, Magnesium Complex, 100 Capsules (250 mg per Capsule)
Nature's Way, Magnesium Complex, 100 Capsules (250 mg per Capsule)
Nature's Way
500 mg507.490.300View on iHerb →
9
Best Naturals, Magnesium Citrate, 250 Tablets (200 mg per Tablet)
Best Naturals, Magnesium Citrate, 250 Tablets (200 mg per Tablet)
Best Naturals
400 mg12517.210.344View on iHerb →
10
Swanson, 100% Pure Magnesium Citrate Powder, Unflavored, 8.6 oz (244 g)
Swanson, 100% Pure Magnesium Citrate Powder, Unflavored, 8.6 oz (244 g)
Swanson
630 mg5812.920.354View on iHerb →
11
NOW Foods, Magnesium Citrate Pure Powder, 8 oz (227 g)
NOW Foods, Magnesium Citrate Pure Powder, 8 oz (227 g)
NOW Foods
450 mg7612.240.358View on iHerb →
12
Nutricost, Magnesium Citrate, Unflavored, 8.9 oz (250 g)
Nutricost, Magnesium Citrate, Unflavored, 8.9 oz (250 g)
Nutricost
210 mg16014.950.445View on iHerb →
13
Vitamatic, Melatonin 10 + Magnesium, 120 Tablets
Vitamatic, Melatonin 10 + Magnesium, 120 Tablets
Vitamatic
200 mg12012.990.541View on iHerb →
14
Nutricost, Potassium + Magnesium, 240 Capsules
Nutricost, Potassium + Magnesium, 240 Capsules
Nutricost
210 mg12013.950.554View on iHerb →
15
Source Naturals, Ultra-Mag™, 240 Tablets
Source Naturals, Ultra-Mag™, 240 Tablets
Source Naturals
420 mg12027.990.555View on iHerb →
16
Solgar, Magnesium Citrate, 120 Tablets
Solgar, Magnesium Citrate, 120 Tablets
Solgar
400 mg6013.900.579View on iHerb →
17
EVLution Nutrition, Magnesium Citrate, 60 Veggie Capsules (200 mg per Capsule)
EVLution Nutrition, Magnesium Citrate, 60 Veggie Capsules (200 mg per Capsule)
EVLution Nutrition
400 mg307.490.624View on iHerb →
18
Micro Ingredients, Magnesium Citrate, 240 Vegetarian Capsules (133 mg per Capsule)
Micro Ingredients, Magnesium Citrate, 240 Vegetarian Capsules (133 mg per Capsule)
Micro Ingredients
400 mg8019.990.625View on iHerb →
19
Source Naturals, Ultra-Mag™, 360 Vegan Capsules
Source Naturals, Ultra-Mag™, 360 Vegan Capsules
Source Naturals
420 mg12031.490.625View on iHerb →
20
Source Naturals, Magnesium Serene™, Berry, 17.6 oz (500 g)
Source Naturals, Magnesium Serene™, Berry, 17.6 oz (500 g)
Source Naturals
800 mg5930.440.645View on iHerb →
21
Source Naturals, Ultra-Mag™, 180 Vegan Capsules
Source Naturals, Ultra-Mag™, 180 Vegan Capsules
Source Naturals
420 mg6016.450.653View on iHerb →
22
Nutricost, Magnesium Citrate, Fruit Punch, 17.9 oz (500 g)
Nutricost, Magnesium Citrate, Fruit Punch, 17.9 oz (500 g)
Nutricost
210 mg16722.950.654View on iHerb →
23
Source Naturals, Ultra-Mag™, 60 Tablets
Source Naturals, Ultra-Mag™, 60 Tablets
Source Naturals
420 mg308.390.666View on iHerb →
24
Source Naturals, Ultra-Mag™, 90 Vegan Capsules
Source Naturals, Ultra-Mag™, 90 Vegan Capsules
Source Naturals
420 mg308.930.709View on iHerb →
25
Nutricost, Magnesium Citrate, 240 Capsules (105 mg per Capsule)
Nutricost, Magnesium Citrate, 240 Capsules (105 mg per Capsule)
Nutricost
420 mg6017.950.712View on iHerb →

How we rank Magnesium (Citrate)

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.