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Cheapest Milk Thistle Extract (Silybum marianum) (seed) on iHerb

Ranked by real cost per 100 mg of Milk Thistle Extract (Silybum marianum) (seed) — cheapest value first.

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

The priciest option here costs about 8.4× more per 100 mg of Milk Thistle Extract (Silybum marianum) (seed) 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, Milk Thistle, 1,000 mg, 240 Capsules
Nutricost, Milk Thistle, 1,000 mg, 240 Capsules
Nutricost
250 mg24013.950.023View on iHerb →
2
Nutricost, Milk Thistle, 1,000 mg, 120 Capsules
Nutricost, Milk Thistle, 1,000 mg, 120 Capsules
Nutricost
250 mg1209.990.033View on iHerb →
3
Primaforce, Milk Thistle, 1,000 mg, 180 Capsules
Primaforce, Milk Thistle, 1,000 mg, 180 Capsules
Primaforce
250 mg18014.990.033View on iHerb →
4
Nature's Answer, Milk Thistle Seed, Fluid Extract, 2,000 mg, 2 fl oz (60 ml)
Nature's Answer, Milk Thistle Seed, Fluid Extract, 2,000 mg, 2 fl oz (60 ml)
Nature's Answer
2,000 mg3022.490.038View on iHerb →
5
California Gold Nutrition, Silymarin Complex, Milk Thistle Extract Plus Dandelion, Artichoke, Curcumin C3 Complex®, Ginger, and BioPerine®, 120 Veggie Capsules
California Gold Nutrition, Silymarin Complex, Milk Thistle Extract Plus Dandelion, Artichoke, Curcumin C3 Complex®, Ginger, and BioPerine®, 120 Veggie Capsules
California Gold Nutrition
300 mg12014.470.040View on iHerb →
6
Nutricost, Milk Thistle, 300 mg, 120 Capsules
Nutricost, Milk Thistle, 300 mg, 120 Capsules
Nutricost
300 mg12014.970.042View on iHerb →
7
Nature's Answer, Milk Thistle Seed, Fluid Extract, Alcohol-Free, 2,000 mg, 1 fl oz (30 ml)
Nature's Answer, Milk Thistle Seed, Fluid Extract, Alcohol-Free, 2,000 mg, 1 fl oz (30 ml)
Nature's Answer
2,000 mg1512.740.043View on iHerb →
8
Force Factor, Milk Thistle, 300 mg , 100 Vegetable Capsules
Force Factor, Milk Thistle, 300 mg , 100 Vegetable Capsules
Force Factor
300 mg10012.990.043View on iHerb →
9
Lake Avenue Nutrition, Milk Thistle Extract, 175 mg, 240 Veggie Capsules
Lake Avenue Nutrition, Milk Thistle Extract, 175 mg, 240 Veggie Capsules
Lake Avenue Nutrition
175 mg24018.510.044View on iHerb →
10
Planetary Herbals, Full Spectrum™ Milk Thistle Seed Extract, 120 Tablets
Planetary Herbals, Full Spectrum™ Milk Thistle Seed Extract, 120 Tablets
Planetary Herbals
840 mg3013.340.053View on iHerb →
11
Lake Avenue Nutrition, Milk Thistle Extract, 175 mg, 90 Veggie Capsules
Lake Avenue Nutrition, Milk Thistle Extract, 175 mg, 90 Veggie Capsules
Lake Avenue Nutrition
175 mg909.580.061View on iHerb →
12
Super Nutrition, Detox Support with Milk Thistle Extract, Picrorhiza Root Extract, Turmeric Extract, Dandelion Powder and Digestive Blend, 180 Veggie Capsules
Super Nutrition, Detox Support with Milk Thistle Extract, Picrorhiza Root Extract, Turmeric Extract, Dandelion Powder and Digestive Blend, 180 Veggie Capsules
Super Nutrition
350 mg9022.730.072View on iHerb →
13
Planetary Herbals, Full Spectrum™ Milk Thistle Seed Extract, 60 Tablets
Planetary Herbals, Full Spectrum™ Milk Thistle Seed Extract, 60 Tablets
Planetary Herbals
840 mg159.380.074View on iHerb →
14
Super Nutrition, Milk Thistle Plus with Turmeric Extract and Artichoke Extract, 175 mg, 120 Veggie Capsules
Super Nutrition, Milk Thistle Plus with Turmeric Extract and Artichoke Extract, 175 mg, 120 Veggie Capsules
Super Nutrition
175 mg12015.750.075View on iHerb →
15
NOW Foods, Milk Thistle Extract with Turmeric, 60 Veg Capsules
NOW Foods, Milk Thistle Extract with Turmeric, 60 Veg Capsules
NOW Foods
300 mg307.330.081View on iHerb →
16
Super Nutrition, Detox Support with Milk Thistle Extract, Picrorhiza Root Extract, Turmeric Extract, Dandelion Powder and Digestive Blend, 60 Veggie Capsules
Super Nutrition, Detox Support with Milk Thistle Extract, Picrorhiza Root Extract, Turmeric Extract, Dandelion Powder and Digestive Blend, 60 Veggie Capsules
Super Nutrition
350 mg309.550.091View on iHerb →
17
21st Century, Standardized Milk Thistle Extract, 200 Vegetarian Capsules (87.5 mg per Capsule)
21st Century, Standardized Milk Thistle Extract, 200 Vegetarian Capsules (87.5 mg per Capsule)
21st Century
175 mg10015.990.091View on iHerb →
18
Futurebiotics, Silymarin Plus™, 120 Vegetarian Tablets
Futurebiotics, Silymarin Plus™, 120 Vegetarian Tablets
Futurebiotics
552 mg4020.970.095View on iHerb →
19
California Gold Nutrition, EuroHerbs, Milk Thistle Extract, Euromed Quality, 175 mg, 60 Veggie Capsules
California Gold Nutrition, EuroHerbs, Milk Thistle Extract, Euromed Quality, 175 mg, 60 Veggie Capsules
California Gold Nutrition
175 mg6011.860.113View on iHerb →
20
NutraBio, European Milk Thistle, 90 Capsules (241 mg per Capsule)
NutraBio, European Milk Thistle, 90 Capsules (241 mg per Capsule)
NutraBio
241 mg9024.990.115View on iHerb →
21
DaVinci Laboratories, Milk Thistle, 300 mg, 90 Capsules
DaVinci Laboratories, Milk Thistle, 300 mg, 90 Capsules
DaVinci Laboratories
300 mg9032.000.119View on iHerb →
22
21st Century, Standardized Milk Thistle Extract, 60 Vegetarian Capsules
21st Century, Standardized Milk Thistle Extract, 60 Vegetarian Capsules
21st Century
175 mg307.990.152View on iHerb →
23
The Vitamin Shoppe, Liver Cleanse, 60 Vegetable Capsules
The Vitamin Shoppe, Liver Cleanse, 60 Vegetable Capsules
The Vitamin Shoppe
400 mg3018.990.158View on iHerb →
24
Seeking Health, Liver Nutrients, 60 Capsules
Seeking Health, Liver Nutrients, 60 Capsules
Seeking Health
250 mg6029.000.193View on iHerb →
25
California Gold Nutrition, Advanced Liver Support with Milk Thistle Extract, L-Glutathione, Alpha Lipoic Acid, and Grape Seed Extract, 90 Veggie Capsules
California Gold Nutrition, Advanced Liver Support with Milk Thistle Extract, L-Glutathione, Alpha Lipoic Acid, and Grape Seed Extract, 90 Veggie Capsules
California Gold Nutrition
300 mg3017.690.197View on iHerb →

How we rank Milk Thistle Extract (Silybum marianum) (seed)

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.