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Cheapest Magnesium Hydroxide on iHerb

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

Prices updated Jul 25, 2026 · 12 products · Prices in USD

The priciest option here costs about 211.3× more per 100 mg of Magnesium Hydroxide than the best-value pick Nature's Answer. 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
Nature's Answer, Marine Based Magnesium, Vanilla Cream, 16 fl oz (480 ml)
Nature's Answer, Marine Based Magnesium, Vanilla Cream, 16 fl oz (480 ml)
Nature's Answer
500 mg9522.490.047View on iHerb →
2
Nature's Life, Marine Magnesium, 100 Vegetarian Capsules (250 mg per Capsule)
Nature's Life, Marine Magnesium, 100 Vegetarian Capsules (250 mg per Capsule)
Nature's Life
500 mg5012.390.050View on iHerb →
3
Nature's Answer, Marine Based Magnesium, 90 Vegetarian Capsules
Nature's Answer, Marine Based Magnesium, 90 Vegetarian Capsules
Nature's Answer
500 mg4517.240.077View on iHerb →
4
Nature's Life, Calcium & Magnesium, Natural Orange, 16 fl oz (473 ml)
Nature's Life, Calcium & Magnesium, Natural Orange, 16 fl oz (473 ml)
Nature's Life
300 mg3116.490.177View on iHerb →
5
Nature's Answer, Marine Based Cal-Mag, 120 Vegetarian Capsules
Nature's Answer, Marine Based Cal-Mag, 120 Vegetarian Capsules
Nature's Answer
125 mg6027.740.370View on iHerb →
6
BrainMD, PMS Relief+, 60 Vegetarian Capsules
BrainMD, PMS Relief+, 60 Vegetarian Capsules
BrainMD
200 mg3029.950.499View on iHerb →
7
Zahler, Colon Cleanse, 10-Day Detox, Cucumber Mint, 3.5 oz (99 g)
Zahler, Colon Cleanse, 10-Day Detox, Cucumber Mint, 3.5 oz (99 g)
Zahler
210 mg1022.721.08View on iHerb →
8
Ancient Nutrition, Multi Collagen Advanced, Hydrate, Berry, 16.9 oz (480 g)
Ancient Nutrition, Multi Collagen Advanced, Hydrate, Berry, 16.9 oz (480 g)
Ancient Nutrition
114 mg3046.711.37View on iHerb →
9
Ancient Nutrition, Multi Collagen Advanced, Hydrate, Lemon Lime, 17 oz (483 g)
Ancient Nutrition, Multi Collagen Advanced, Hydrate, Lemon Lime, 17 oz (483 g)
Ancient Nutrition
114 mg3046.711.37View on iHerb →
10
Ancient Nutrition, Rapid Hydration, Strawberry Lemonade, 15 On-The-Go Stick Packs, 0.2 oz (6.1 g) Each
Ancient Nutrition, Rapid Hydration, Strawberry Lemonade, 15 On-The-Go Stick Packs, 0.2 oz (6.1 g) Each
Ancient Nutrition
76 mg1529.952.63View on iHerb →
11
Ancient Nutrition, Rapid Hydration, Lemon Lime, 15 On-The-Go Stick Packs, 0.2 oz (6 g) Each
Ancient Nutrition, Rapid Hydration, Lemon Lime, 15 On-The-Go Stick Packs, 0.2 oz (6 g) Each
Ancient Nutrition
76 mg1529.952.63View on iHerb →
12
Irwin Naturals, Daily-Multi Testosterone Up ® Booster For Men, 60 Liquid Soft-Gels
Irwin Naturals, Daily-Multi Testosterone Up ® Booster For Men, 60 Liquid Soft-Gels
Irwin Naturals
10 mg3029.9910.00View on iHerb →

How we rank Magnesium Hydroxide

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.