Natural Factors Herbal Factors®, Premium Milk Thistle, 160 mg, 60 Vegetarian Capsules supplement bottle
Natural Factors

Herbal Factors®, Premium Milk Thistle, 160 mg, 60 Vegetarian Capsules

What We Researched
3 active ingredients analyzed · 4 inactive ingredients decoded · 5 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
56
Product Score Poor
88
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium (dicalcium phosphate) 40 mg 3%
Siliphos®Milk Thistle Phytosome(Silybum marianum (seed) / Silybin-phosphatidylcholine complex) 160 mg **
Silybin (29-36%) 46-57.6 mg **
Bioavailability Poor

Absorption Rating

  • Calcium (dicalcium phosphate) Fair
  • Siliphos®Milk Thistle Phytosome(Silybum marianum (seed) / Silybin-phosphatidylcholine complex) Poor
Other Ingredients Excellent

Fillers & Additives

  • Vegetarian Capsule (Carbohydrate Gum [Cellulose], Purified Water)
  • Silica
  • Croscarmellose Sodium
  • Magnesium Stearate (Vegetable Grade)
Efficacy Very Poor

Dosage Analysis

  • Calcium (dicalcium phosphate) 40 mg Under-dosed
  • Siliphos®Milk Thistle Phytosome(Silybum marianum (seed) / Silybin-phosphatidylcholine complex) 160 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calcium (dicalcium phosphate) 40 mg 3%
Siliphos®Milk Thistle Phytosome(Silybum marianum (seed) / Silybin-phosphatidylcholine complex) 160 mg **
Silybin (29-36%) 46-57.6 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Vegetarian Capsule (Carbohydrate Gum [Cellulose], Purified Water) Safe

It provides a vegetarian encapsulation option.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Magnesium Stearate (Vegetable Grade) Generally_safe

It is used to prevent ingredients from sticking to manufacturing equipment.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$20$19$18$17$16 Mar 12 $18.17
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Natural Factors

Founded 1950 · Coquitlam, British Columbia, Canada · 390 products · naturalfactors.com

Certifications

5 certifications
B Corp Certified Verified Source
Usp Verified Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Usda Organic Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

5 incidents
Prop 65 Lead2025-10-31Source
Recall Hi Potency B Complex, RevitalX, Super Multi® IRON FREE2024-07-19Source
Lawsuit Products labeled as containing glucosamine sulfate did not contain the ingredient.2021Source
Prop 65 Lead2016-01-13Source
Recall Natural Factors L-Arginine 500mg2006-04-05Source
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Frequently Asked Questions
Is Natural Factors Herbal Factors®, Premium Milk Thistle a good supplement?

Natural Factors Herbal Factors®, Premium Milk Thistle, 160 mg, 60 Vegetarian Capsules received a product quality score of 56/100 in GoodSupp's independent analysis, indicating several areas of concern that consumers should review. The product contains 3 active ingredients Of the 4 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, Natural Factors, holds a brand trust score of 88/100 with 5 verified certifications including B Corp Certified, Usp Verified, Fda Gmp Inspections, Non Gmo Project.

What are the ingredients in Natural Factors Herbal Factors®, Premium Milk Thistle?

Natural Factors Herbal Factors®, Premium Milk Thistle contains 3 active ingredients: Calcium (dicalcium phosphate) (40 mg), Siliphos®Milk Thistle Phytosome(Silybum marianum (seed) / Silybin-phosphatidylcholine complex) (160 mg), Silybin (29-36%) (46-57.6 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Natural Factors Herbal Factors®, Premium Milk Thistle safe to take?

Natural Factors Herbal Factors®, Premium Milk Thistle, 160 mg, 60 Vegetarian Capsules has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Natural Factors a trustworthy supplement brand?

Natural Factors receives a brand trust score of 88/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1950 and headquartered in Coquitlam, British Columbia, Canada, the company offers 390 products in their lineup. They hold 5 verified certifications including B Corp Certified, Usp Verified, Fda Gmp Inspections, Non Gmo Project. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Natural Factors has 5 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.