Swanson Milk Thistle
- Milk Thistle
- Capsule
- 120
A straightforward standardized milk thistle capsule at a common 250 mg, 80% silymarin ratio, useful for anyone who specifically wants extract standardization.
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How it ranks among the 76 milk thistle we track
4.4★ across 218 Amazon ratings, Bayesian-smoothed toward the category average.
218 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
100+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 76 milk thistle we track - how the scorecard works · full milk thistle data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
Swanson Milk Thistle is a standardized herbal capsule supplement, 250 mg of milk thistle seed extract per capsule standardized to 80% silymarin, sold in a 120-capsule bottle.
Standardizing to 80% silymarin ties potency to a measured percentage rather than raw seed weight, which is what separates this from generic, unstandardized milk thistle powder. Model SWO161.
- 250 mg milk thistle seed extract per capsule
- Standardized to 80% silymarin
- 120 capsules per bottle
- Capsule form
Who it's for
People building a daily milk thistle routine who want a fixed, standardized silymarin dose rather than raw seed powder of unknown potency.
Strengths and trade-offs
Drawn from this product's published specifications.
- Standardized to 80% silymarin for consistent potency
- 120-capsule count covers roughly four months at one a day
- Capsule form for straightforward daily dosing
- No stated dosing frequency or testing detail in the listing
- Single-ingredient formula, no combination liver-support herbs
Performance notes
Standardization to 80% silymarin means each 250 mg capsule delivers consistent active compound content batch to batch, unlike unstandardized milk thistle where silymarin levels can vary widely.
Specifications
| Brand | Swanson |
|---|---|
| Model | SWO161 |
| Form | Capsule |
| Supplement Type | Milk Thistle Seed Extract 250 mg |
| Count | 120 |
Other Swanson milk thistle
How it compares
This product against the closest alternatives we track in milk thistle.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Swanson Milk ThistleThis product | 4.4 / 5 | 218 | 3.8 / 5 |
| Bronson Milk Thistle Silymarin Marianum & Dandelion Extract Liver Health SupportBronson | 4.7 / 5 | 39,909 | 4.6 / 5 |
| Zazzee USDA Organic Milk Thistle 30:1 ExtractZazzee | 4.7 / 5 | 11,691 | 4.6 / 5 |
| Nature's Bounty Milk Thistle 1000mgNature's | 4.7 / 5 | 9,983 | 4.6 / 5 |
| Nutricost Milk Thistle Extract 240 Capsules for 240 Servings Per BottleNutricost | 4.8 / 5 | 4,973 | 4.6 / 5 |
Similar milk thistle from other brands
Questions about the Swanson SWO161
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How much silymarin is in each Swanson Milk Thistle capsule?
Each 250 mg capsule is standardized to 80% silymarin.
How many capsules come in the Swanson Milk Thistle SWO161 bottle?
The bottle contains 120 capsules.
What form is Swanson Milk Thistle sold in?
It comes as a capsule, not a liquid or powder.