Get the App
Thorne D-1,000 25 mcg supplement bottle
Thorne

D-1,000 25 mcg Review

What We Researched
1 active ingredient analyzed · 5 inactive ingredients decoded · 10 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
98
Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D (as Vitamin D3)(1,000 IU) 25 mcg 125%
Bioavailability Excellent

Absorption Rating

  • Vitamin D (as Vitamin D3)(1,000 IU) Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Hypromellose (Derived from Cellulose) Capsule
  • Leucine
  • Silicon Dioxide
  • Vitamin E (d-alpha tocopheryl)
Efficacy Excellent

Dosage Analysis

  • Vitamin D (as Vitamin D3)(1,000 IU) 25 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D (as Vitamin D3)(1,000 IU) 25 mcg 125%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Hypromellose (Derived from Cellulose) Capsule Safe

It is used to encapsulate supplement ingredients.

Leucine Safe

It is used for its potential muscle-building and recovery benefits.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Vitamin E (d-alpha tocopheryl) Unknown
Brand Trust Report
Thorne

Founded 1984 · New York, NY, United States · 204 products · thorne.com

Certifications

10 certifications
Nsf Certified For Sport Source available Primary evidence
Nsf Gmp Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
NSF Certified for Sport Supporting evidence unavailable
NSF Contents Certified Supporting evidence unavailable
Informed Choice Supporting evidence unavailable
Informed Sport Supporting evidence unavailable
Eurofins Certified Supplement Supporting evidence unavailable
Eurofins Clean Sport Supporting evidence unavailable
NSF Certified Supporting evidence unavailable

Transparency

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

Violation History

2 incidents
Recall Captomer, Captomer-2502014-06-12 Source available Primary source
Prop 65 Lead2013-12-13 Source available Primary source
Related Supplements
Tru Niagen Tru Niagen Pro 1000 mg
Tru Niagen Tru Niagen Pro 1000 mg
Product 100 Brand 100
Jamieson Extra Strength D3 2500 IU
Jamieson Extra Strength D3 2500 IU
Product 100 Brand 100
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Product 100 Brand 100
Thorne Vitamin D3
Thorne Vitamin D3
Product 100 Brand 98
Thorne L-Tyrosine
Thorne L-Tyrosine
Product 100 Brand 98
Thorne Olive Leaf Extract
Thorne Olive Leaf Extract
Product 100 Brand 98
Frequently Asked Questions
Is Thorne D-1,000 25 mcg a good supplement?

Thorne D-1,000 25 mcg received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients Of the 5 inactive ingredients, 4 are rated safe and 0 ingredients are flagged for review. The manufacturer, Thorne, holds a brand trust score of 98/100.

What are the ingredients in Thorne D-1,000 25 mcg?

Thorne D-1,000 25 mcg contains 1 active ingredients: Vitamin D (as Vitamin D3)(1,000 IU) (25 mcg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Thorne D-1,000 25 mcg safe to take?

GoodSupp reviewed the inactive-ingredient data available for Thorne D-1,000 25 mcg. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Thorne a trustworthy supplement brand?

Thorne receives a brand trust score of 98/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1984 and headquartered in New York, NY, United States, the company offers 204 products in their lineup. Note: Thorne has 2 historical regulatory incidents on record, which are factored into the trust score.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Download on App Store Browse All Supplements
Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. 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.