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Cheapest Calcium (as calcium carbonate) on iHerb

Ranked by real cost per 100 mg of Calcium (as calcium carbonate) — cheapest value first.

Prices updated Jul 25, 2026 · 9 products · Prices in USD

The priciest option here costs about 2.9× more per 100 mg of Calcium (as calcium carbonate) than the best-value pick NutriBiotic. 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
NutriBiotic, Immunity, Hypo-Aller C, Vitamin C with Calcium, Magnesium, Potassium & Zinc, 2.2 lb (1 kg)
NutriBiotic, Immunity, Hypo-Aller C, Vitamin C with Calcium, Magnesium, Potassium & Zinc, 2.2 lb (1 kg)
NutriBiotic
125 mg40030.300.061View on iHerb →
2
NutriBiotic, Immunity, Ascorbate Bio-C, Vitamin C with Bioflavonoids and Minerals, 2.2 lb (1 kg)
NutriBiotic, Immunity, Ascorbate Bio-C, Vitamin C with Bioflavonoids and Minerals, 2.2 lb (1 kg)
NutriBiotic
125 mg40031.790.064View on iHerb →
3
NutriBiotic, Immunity, Ascorbate Bio-C, Vitamin C with Bioflavonoids and Minerals, 16 oz (454 g)
NutriBiotic, Immunity, Ascorbate Bio-C, Vitamin C with Bioflavonoids and Minerals, 16 oz (454 g)
NutriBiotic
125 mg18116.500.073View on iHerb →
4
NutriBiotic, Immunity, Hypo-Aller C, Vitamin C with Calcium, Magnesium, Potassium & Zinc, 8 oz (227 g)
NutriBiotic, Immunity, Hypo-Aller C, Vitamin C with Calcium, Magnesium, Potassium & Zinc, 8 oz (227 g)
NutriBiotic
125 mg9010.490.093View on iHerb →
5
NutriBiotic, Immunity, Ascorbate Bio-C Powder, Vitamin C With Bioflavonoids And Minerals, 8 oz (227 g)
NutriBiotic, Immunity, Ascorbate Bio-C Powder, Vitamin C With Bioflavonoids And Minerals, 8 oz (227 g)
NutriBiotic
125 mg9011.990.107View on iHerb →
6
NutriBiotic, Immunity, Cherry Electro-C Powder, Cherry, 16 oz (454 g)
NutriBiotic, Immunity, Cherry Electro-C Powder, Cherry, 16 oz (454 g)
NutriBiotic
44 mg36319.120.120View on iHerb →
7
NutriBiotic, Immunity, Cherry Electro-C Powder, 8 oz (227 g)
NutriBiotic, Immunity, Cherry Electro-C Powder, 8 oz (227 g)
NutriBiotic
44 mg18111.240.141View on iHerb →
8
NutriBiotic, Immunity, Buffered Vitamin C With Calcium, Magnesium, Potassium & Zinc, 250 Gluten Free Capsules
NutriBiotic, Immunity, Buffered Vitamin C With Calcium, Magnesium, Potassium & Zinc, 250 Gluten Free Capsules
NutriBiotic
45 mg25017.240.153View on iHerb →
9
NutriBiotic, Immunity, Buffered Vitamin C, 100 Gluten Free Capsules
NutriBiotic, Immunity, Buffered Vitamin C, 100 Gluten Free Capsules
NutriBiotic
45 mg1007.870.175View on iHerb →

How we rank Calcium (as calcium carbonate)

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.