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Cheapest Vitamin C (magnesium ascorbate) on iHerb

Ranked by real cost per 100 mg of Vitamin C (magnesium ascorbate) — cheapest value first.

Prices updated Jul 25, 2026 · 15 products · Prices in USD

The priciest option here costs about 539.5× more per 100 mg of Vitamin C (magnesium ascorbate) than the best-value pick Swanson. 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
Swanson, Buffered C Powder, Unflavored, 4 oz (113 g)
Swanson, Buffered C Powder, Unflavored, 4 oz (113 g)
Swanson
830 mg11315.290.016View on iHerb →
2
Rainbow Light, Complete B-Complex+™, 90 Tablets
Rainbow Light, Complete B-Complex+™, 90 Tablets
Rainbow Light
500 mg3025.490.170View on iHerb →
3
Rainbow Light, Magnesium Calcium+™, 90 Caplets
Rainbow Light, Magnesium Calcium+™, 90 Caplets
Rainbow Light
65 mg9014.870.254View on iHerb →
4
Rainbow Light, Magnesium Calcium+™, 180 Caplets
Rainbow Light, Magnesium Calcium+™, 180 Caplets
Rainbow Light
65 mg18031.440.269View on iHerb →
5
Michael's Health, Sugar Metabolism Factors, 180 Vegetarian Tablets
Michael's Health, Sugar Metabolism Factors, 180 Vegetarian Tablets
Michael's Health
300 mg3046.790.520View on iHerb →
6
Michael's Health, Sugar Metabolism Factors, 90 Vegetarian Tablets
Michael's Health, Sugar Metabolism Factors, 90 Vegetarian Tablets
Michael's Health
300 mg1529.750.661View on iHerb →
7
Advanced Orthomolecular Research AOR, Multi Basics 3, 180 Capsules
Advanced Orthomolecular Research AOR, Multi Basics 3, 180 Capsules
Advanced Orthomolecular Research AOR
120 mg6048.370.672View on iHerb →
8
NOW Foods, Coenzyme B-Complex With Alpha Lipoic Acid and CoQ10, 120 Veg Capsules
NOW Foods, Coenzyme B-Complex With Alpha Lipoic Acid and CoQ10, 120 Veg Capsules
NOW Foods
60 mg6029.390.816View on iHerb →
9
Purity Products, Ultimate H.A. Formula, 90 Capsules
Purity Products, Ultimate H.A. Formula, 90 Capsules
Purity Products
120 mg3033.000.917View on iHerb →
10
NOW Foods, Co-Enzyme B-Complex, 60 Veg Capsules
NOW Foods, Co-Enzyme B-Complex, 60 Veg Capsules
NOW Foods
60 mg3017.130.952View on iHerb →
11
Purity Products, H.A. Joint Formula, 90 Capsules
Purity Products, H.A. Joint Formula, 90 Capsules
Purity Products
120 mg3039.951.11View on iHerb →
12
Purity Products, H.A. Joint & Skin™, Super Formula, 90 Capsules
Purity Products, H.A. Joint & Skin™, Super Formula, 90 Capsules
Purity Products
120 mg3039.951.11View on iHerb →
13
Protocol for Life Balance, B Complex Neuro Factors, 60 Veg Capsules
Protocol for Life Balance, B Complex Neuro Factors, 60 Veg Capsules
Protocol for Life Balance
60 mg3032.001.78View on iHerb →
14
Econugenics, Cellular Shield, Radiation + EMF Defense, 60 Vegetarian Capsules
Econugenics, Cellular Shield, Radiation + EMF Defense, 60 Vegetarian Capsules
Econugenics
125 g1552.252.79View on iHerb →
15
Advanced Orthomolecular Research AOR, Ortho Core, 180 Capsules
Advanced Orthomolecular Research AOR, Ortho Core, 180 Capsules
Advanced Orthomolecular Research AOR
20 mg3052.768.79View on iHerb →

How we rank Vitamin C (magnesium ascorbate)

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.