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Cheapest Magnesium Elemental on iHerb

Ranked by real cost per 100 mg of Magnesium Elemental — cheapest value first.

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

The priciest option here costs about 45.4× more per 100 mg of Magnesium Elemental 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 100 mg
1
Nutricost, Magnesium Chloride, Unflavored, 32.4 oz (907 g)
Nutricost, Magnesium Chloride, Unflavored, 32.4 oz (907 g)
Nutricost
210 mg47125.220.026View on iHerb →
2
NOW Foods, Calcium & Magnesium, 250 Tablets
NOW Foods, Calcium & Magnesium, 250 Tablets
NOW Foods
500 mg12518.370.029View on iHerb →
3
NOW Foods, Magnesium Citrate, 200 mg, 250 Tablets
NOW Foods, Magnesium Citrate, 200 mg, 250 Tablets
NOW Foods
400 mg12524.490.049View on iHerb →
4
NOW Foods, Calcium & Magnesium, 240 Softgels
NOW Foods, Calcium & Magnesium, 240 Softgels
NOW Foods
333 mg12020.210.051View on iHerb →
5
Natural Factors, Magnesium Citrate, 360 Capsules (150 mg Per capsule)
Natural Factors, Magnesium Citrate, 360 Capsules (150 mg Per capsule)
Natural Factors
450 mg12029.370.054View on iHerb →
6
NOW Foods, Calcium & Magnesium with Vitamin D3 and Zinc, 120 Softgels
NOW Foods, Calcium & Magnesium with Vitamin D3 and Zinc, 120 Softgels
NOW Foods
333 mg6011.020.055View on iHerb →
7
NOW Foods, Magnesium Citrate, 100 Tablets (200 mg per Tablet)
NOW Foods, Magnesium Citrate, 100 Tablets (200 mg per Tablet)
NOW Foods
400 mg5012.240.061View on iHerb →
8
Natural Factors, Magnesium Citrate, 180 Capsules (150 mg Per capsule)
Natural Factors, Magnesium Citrate, 180 Capsules (150 mg Per capsule)
Natural Factors
450 mg6017.470.065View on iHerb →
9
NOW Foods, Magnesium Inositol Relax, Lemonade, 16 oz (454 g)
NOW Foods, Magnesium Inositol Relax, Lemonade, 16 oz (454 g)
NOW Foods
400 mg7620.210.067View on iHerb →
10
NOW Foods, Liquid Magnesium with Trace Minerals, 8 fl oz (237 ml)
NOW Foods, Liquid Magnesium with Trace Minerals, 8 fl oz (237 ml)
NOW Foods
125 mg19317.140.071View on iHerb →
11
NOW Foods, Magnesium Citrate, 240 Veg Capsules (133 mg per Capsule)
NOW Foods, Magnesium Citrate, 240 Veg Capsules (133 mg per Capsule)
NOW Foods
400 mg8023.270.073View on iHerb →
12
NOW Foods, Calcium & Magnesium With Vitamin D3, 8 oz (227 g)
NOW Foods, Calcium & Magnesium With Vitamin D3, 8 oz (227 g)
NOW Foods
400 mg4513.460.075View on iHerb →
13
NOW Foods, Magnesium Citrate, 120 Veg Capsules (133 mg per Capsule)
NOW Foods, Magnesium Citrate, 120 Veg Capsules (133 mg per Capsule)
NOW Foods
400 mg4012.240.077View on iHerb →
14
NOW Foods, Magnesium Citrate, 60 Veg Capsules (133 mg per Capsule)
NOW Foods, Magnesium Citrate, 60 Veg Capsules (133 mg per Capsule)
NOW Foods
400 mg207.330.092View on iHerb →
15
NOW Foods, Magnesium Citrate, 180 Softgels (133 mg per Softgel)
NOW Foods, Magnesium Citrate, 180 Softgels (133 mg per Softgel)
NOW Foods
400 mg6022.040.092View on iHerb →
16
NOW Foods, Magnesium Citrate, 90 Softgels (133 mg per Softgel)
NOW Foods, Magnesium Citrate, 90 Softgels (133 mg per Softgel)
NOW Foods
400 mg3012.240.102View on iHerb →
17
Protocol for Life Balance, Magnesium Citrate, 180 Softgels (133 mg per Softgel)
Protocol for Life Balance, Magnesium Citrate, 180 Softgels (133 mg per Softgel)
Protocol for Life Balance
400 mg6034.000.142View on iHerb →
18
Vitamatic, Magnesium Gluconate, 1,000 mg, 180 Tablets
Vitamatic, Magnesium Gluconate, 1,000 mg, 180 Tablets
Vitamatic
50 mg18014.990.167View on iHerb →
19
California Gold Nutrition, Algae-Based Calcium with Calcium, Vitamin D3, and Magnesium, Organic Strawberry, Raspberry, and Blueberry, 180 Tablets
California Gold Nutrition, Algae-Based Calcium with Calcium, Vitamin D3, and Magnesium, Organic Strawberry, Raspberry, and Blueberry, 180 Tablets
California Gold Nutrition
77 mg6026.620.576View on iHerb →
20
Super Nutrition, Organic Calcium & Magnesium Plus D3 & K2, 180 Tablets
Super Nutrition, Organic Calcium & Magnesium Plus D3 & K2, 180 Tablets
Super Nutrition
70 mg6028.000.667View on iHerb →
21
NOW Foods, Magtein®, Magnesium L-Threonate, 180 Veg Capsules
NOW Foods, Magtein®, Magnesium L-Threonate, 180 Veg Capsules
NOW Foods
144 mg6067.360.780View on iHerb →
22
Magtein� 90 Veg Capsules | NOW Foods
Magtein� 90 Veg Capsules | NOW Foods
NOW Foods
144 mg3035.070.812View on iHerb →
23
IP-6 International, IP6 Gold®, Immune Support Formula, 240 Vegetarian Capsules
IP-6 International, IP6 Gold®, Immune Support Formula, 240 Vegetarian Capsules
IP-6 International
42 mg12041.560.825View on iHerb →
24
IP-6 International, IP6 Gold®, Immune Support Formula, 120 Vegetarian Capsules
IP-6 International, IP6 Gold®, Immune Support Formula, 120 Vegetarian Capsules
IP-6 International
42 mg6021.560.856View on iHerb →
25
Protocol for Life Balance, Magtein®, Magnesium L-Threonate, 90 Veg Capsules
Protocol for Life Balance, Magtein®, Magnesium L-Threonate, 90 Veg Capsules
Protocol for Life Balance
144 mg3050.001.16View on iHerb →

How we rank Magnesium Elemental

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.