Douglas Laboratories Liquid D and K Natural Vanilla Flavor supplement bottle
Douglas Laboratories

Liquid D and K Natural Vanilla Flavor Review

What We Researched
3 active ingredients analyzed · 8 inactive ingredients decoded · 6 brand certifications checked · Page generated: Sep 2026
93
Product Score Excellent
100
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 D3 (as Cholecalciferol) 25 mcg 125%
Vitamin K1 500 mcg 417%
Vitamin K2 (as Menaquinone-4, Menaquinone-7) 1045 mg †
Bioavailability Very Good

Absorption Rating

  • Vitamin D3 (as Cholecalciferol) Good
  • Vitamin K1 Fair
  • Vitamin K2 (as Menaquinone-4, Menaquinone-7) Good
Other Ingredients Excellent

Fillers & Additives

  • Water
  • Medium Chain Triglyceride
  • Sunflower Oil
  • Cellulose
  • Xanthan Gum
  • Potassium
  • Phosphoric Acid
  • Stevia
Efficacy Excellent

Dosage Analysis

  • Vitamin D3 (as Cholecalciferol) 25 mcg Effective
  • Vitamin K1 500 mcg Effective
  • Vitamin K2 (as Menaquinone-4, Menaquinone-7) 1045 mg High

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D3 (as Cholecalciferol) 25 mcg 125%
Vitamin K1 500 mcg 417%
Vitamin K2 (as Menaquinone-4, Menaquinone-7) 1045 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Water Safe

Dissolves and carries water-soluble ingredients.

Medium Chain Triglyceride Unknown
Sunflower Oil Safe

Helps dissolve and absorb fat-soluble vitamins.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Xanthan Gum Safe

Thickens and stabilizes liquid and semi-solid supplements.

Potassium Unknown
Phosphoric Acid Generally_safe

It is used to adjust the pH of supplements.

Stevia Safe

It is used as a sweetener.

Brand Trust Report
Douglas Laboratories

Founded 1955 · Pittsburgh, Pennsylvania, United States · 32 products · douglaslabs.com

Certifications

6 certifications
Consumerlab Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
Nsf Certified For Sport Source available Primary evidence
Nsf Gmp Source available Primary evidence
Usda Organic Source available Primary evidence
NSF Certified Supporting evidence unavailable

Transparency

5 claims
Third Party Testing Claim — Verified Evidence available Evidence
Coa Availability — Verified Evidence available Evidence
In House Testing — Verified Evidence available Evidence
Testing Lab Disclosure — True Brand claim; evidence unavailable

Violation History

2 incidents
Recall Douglas Labs Stress-B-Plus2024-10-07 Source available Primary source
Prop 65 Lead2008-10-22 Source available Primary source
Related Supplements
Frequently Asked Questions
Is Douglas Laboratories Liquid D and K Natural Vanilla Flavor a good supplement?

Douglas Laboratories Liquid D and K Natural Vanilla Flavor received a product quality score of 93/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 3 active ingredients with 30 servings per container. Of the 8 inactive ingredients, 6 are rated safe and 0 ingredients are flagged for review. The manufacturer, Douglas Laboratories, holds a brand trust score of 100/100.

What are the ingredients in Douglas Laboratories Liquid D and K Natural Vanilla Flavor?

Douglas Laboratories Liquid D and K Natural Vanilla Flavor contains 3 active ingredients: Vitamin D3 (as Cholecalciferol) (25 mcg), Vitamin K1 (500 mcg), Vitamin K2 (as Menaquinone-4, Menaquinone-7) (1045 mg). Notable high-dose ingredients include Vitamin K1 at 417% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Douglas Laboratories Liquid D and K Natural Vanilla Flavor safe to take?

GoodSupp reviewed the inactive-ingredient data available for Douglas Laboratories Liquid D and K Natural Vanilla Flavor. 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 Douglas Laboratories a trustworthy supplement brand?

Douglas Laboratories receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1955 and headquartered in Pittsburgh, Pennsylvania, United States, the company offers 32 products in their lineup. Note: Douglas Laboratories has 2 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 — 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.