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Cheapest Soy Isoflavones on iHerb

Ranked by real cost per 100 mg of Soy Isoflavones — cheapest value first.

Prices updated Jul 25, 2026 · 17 products · Prices in USD

The priciest option here costs about 394.3× more per 100 mg of Soy Isoflavones 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, Soy Isoflavones, 150 mg, 180 Capsules
Nutricost, Soy Isoflavones, 150 mg, 180 Capsules
Nutricost
150 mg18018.950.070View on iHerb →
2
21st Century, Soy Isoflavones Extract, Standardized, 60 Vegetarian Capsules (50 mg per Capsules)
21st Century, Soy Isoflavones Extract, Standardized, 60 Vegetarian Capsules (50 mg per Capsules)
21st Century
100 mg307.990.266View on iHerb →
3
CATALO, Women's Soy Isoflavones, 60 Vegetarian Capsules (125 mg Per Capsule)
CATALO, Women's Soy Isoflavones, 60 Vegetarian Capsules (125 mg Per Capsule)
CATALO
125 mg6032.220.430View on iHerb →
4
Futurebiotics, EstroComfort®, Menopausal Balancing Complex, 56 Vegetarian Capsules
Futurebiotics, EstroComfort®, Menopausal Balancing Complex, 56 Vegetarian Capsules
Futurebiotics
100 mg2816.770.599View on iHerb →
5
Doctor's Best, Women's Menopause Support®, 30 Veggie Caps
Doctor's Best, Women's Menopause Support®, 30 Veggie Caps
Doctor's Best
106 mg3019.990.629View on iHerb →
6
LifeSeasons, Pausitivi-T®, Menopause Support, 60 Veg Capsules
LifeSeasons, Pausitivi-T®, Menopause Support, 60 Veg Capsules
LifeSeasons
150 mg3029.990.666View on iHerb →
7
NOW Foods, Menopause Support, 90 Veg Capsules
NOW Foods, Menopause Support, 90 Veg Capsules
NOW Foods
60 mg3015.300.850View on iHerb →
8
Solaray, Prostate Defense™, 90 VegCaps
Solaray, Prostate Defense™, 90 VegCaps
Solaray
100 mg3036.191.21View on iHerb →
9
Great Wall Brand, Yin Chiao Chieh Tu Pien, 96 Tablets
Great Wall Brand, Yin Chiao Chieh Tu Pien, 96 Tablets
Great Wall Brand
57 mg2420.391.49View on iHerb →
10
California Gold Nutrition, Active Women's Multivitamin with Black Cohosh, Soy Isoflavones, and Cranberry Concentrate, 180 Tablets
California Gold Nutrition, Active Women's Multivitamin with Black Cohosh, Soy Isoflavones, and Cranberry Concentrate, 180 Tablets
California Gold Nutrition
25 mg6027.541.84View on iHerb →
11
pH-D Feminine Health, Holistic Menopause Support, 30 Count
pH-D Feminine Health, Holistic Menopause Support, 30 Count
pH-D Feminine Health
40 mg3026.992.25View on iHerb →
12
Source Naturals, HeartScience™, Multi-Nutrient Complex, 120 Tablets
Source Naturals, HeartScience™, Multi-Nutrient Complex, 120 Tablets
Source Naturals
100 mg2046.632.33View on iHerb →
13
Rule One Proteins, Women's Multi™, Active Lifestyle, 60 Tablets
Rule One Proteins, Women's Multi™, Active Lifestyle, 60 Tablets
Rule One Proteins
5 mg3010.967.31View on iHerb →
14
Solaray, Calcium D-Glucarate, 60 Capsules
Solaray, Calcium D-Glucarate, 60 Capsules
Solaray
10 mg3026.498.83View on iHerb →
15
Source Naturals, Genistein Soy Complex, 60 Tablets
Source Naturals, Genistein Soy Complex, 60 Tablets
Source Naturals
2 g309.7416.23View on iHerb →
16
Qualia, Senolytic, 12 Capsules
Qualia, Senolytic, 12 Capsules
Qualia
200 mg279.0019.75View on iHerb →
17
Optimum Nutrition, Opti-Women®, Multivitamin for Active Women, 120 Capsules
Optimum Nutrition, Opti-Women®, Multivitamin for Active Women, 120 Capsules
Optimum Nutrition
2 mg6033.2227.68View on iHerb →

How we rank Soy Isoflavones

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.