10 Best Third Party Tested Vitamin D3 of 2025

Tested and Reviewed: Top 10 Third Party Tested Vitamin D3 deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

Sports Research

Sports Research® Vitamin D3 w/Coconut MCT Oil - High Potency Vitamin D3 5000iu (125mcg) Supplement for Immune & Bone Support - Seed Oil Free - Non-GMO - Gluten Free (360 Liquid Softgels)

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Editor's bottom line:

“This third party tested vitamin d3 is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

SHINE BRIGHT: Vitamin D3 helps the body absorb calcium and phosphorus - essential minerals for maintaining strong bones and teeth. It's also known as the 'sunshine vitamin', with adequate levels providing immune system support and muscular wellness so you can shine at your brightest.*
ONE-A-DAY FORMULA: Just one easy-to-swallow liquid softgel daily provides 125 mcg (5,000 iu) of high potency Vitamin D3 as cholecalciferol - the body's preferred form of Vitamin D.*
WITH COCONUT MCT OIL: Vitamin D-3 delivers the best benefits when taken with food or another source of fat, which is why we add medium chain triglycerides (MCT), the best fats from coconut oil, to our softgels to help ensure that you get the most from this essential micronutrient.*
PREMIUM QUALITY: We hold all of our supplements to a higher standard. Sports Research Vitamin D3 softgels are IGEN Non-GMO tested, and free of unwanted fillers, gluten, and seed oils such as soybean & safflower oil. Each batch is third-party tested for quality and manufactured in the USA in a cGMP-compliant facility.
THE SPORTS RESEARCH DIFFERENCE: Founded in 1980, Sports Research is a family-owned business born from a passion for fitness and wellness. Our goal is to embrace the sport of life through research-backed products created for every bodyinside and out.

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Picked by 397 people today

9.5

Sports Research

Sports Research® Vitamin D3 + K2 w/ Coconut Oil - Vegan Vitamin D 5000iu & Mk7 Vitamin K 100mcg for Bone & Immune Support - Vegan Certified · Non-GMO · Soy Free - 60 Softgels

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Main Highlights

D3 + K2 TEAMWORK THAT MATTERS: Vitamins D3 and K2 work synergistically to support strong bones, immune health, and proper calcium metabolism.* D3 helps your body absorb calcium, while K2 (as MK-7) guides it to the bones where it belongs.* Together, they form a powerful combo for total-body wellness.*
PLANT-BASED, VEGAN-FRIENDLY FORMULA: Our D3 + K2 supplement uses vegan D3 (cholecalciferol) sourced from lichen and K2 (MK-7) derived from fermented chickpeas, with coconut MCT oil added to support optimal nutrient absorption.* No animal ingredients, everjust effective, science-backed support.*
ONCE-A-DAY IMMUNE & BONE SUPPORT: Each easy-to-swallow softgel delivers 125 mcg (5000 IU) of vegan D3 and 100 mcg of K2 (MK-7)the most bioavailable form of K2. Just one softgel per day helps promote bone health, immune support, and cardiovascular health in both women and men.*
CERTIFIED CLEAN & QUALITY TESTED: Our vitamin D3 and K2 formula is Vegan Certified, Non-GMO Project Verified, and free of carrageenan, gluten, soy, and artificial fillers. Each batch is 3rd-party tested and manufactured in the USA in a cGMP-compliant facilitybecause your health deserves the highest standard.
NUTRITION YOU CAN TRUST: At Sports Research, we craft supplements with ingredients you recognize and results you can feel. Our D3 + K2 softgels deliver plant-based purity, clinical strength, and real transparency, helping you live brighter every daynaturally.*

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9.5

Nutricost

Nutricost Vitamin D3 5,000 IU (125mcg), 240 Softgels - Non-GMO and Gluten Free Vitamin D

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Main Highlights

240 Vitamin D3 Softgels Per Bottle
Each Capsule Contains 5,000IU (125mcg) of Vitamin D3
High Quality Vitamin D3
Non-GMO, Gluten Free, 3rd Party Tested
Made in a NSF Certified, GMP Compliant, FDA Registered Facility

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9.2

NatureWise

NatureWise Vitamin D3 5000iu (125 mcg) 1 Year Supply for Immune Support, Healthy Muscle Function, and Bone Health - Non-GMO, Gluten Free in Organic Extra Virgin Olive Oil, (Mini Softgel), 360 Count

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Main Highlights

IMMUNE, MOOD, BONE & MUSCLE SUPPORT*: Vitamin D supports healthy bones, muscle function, and a strong immune system.*
NATURALLY-SOURCED, NON-GMO: These Vitamin D3 immune support and bone health supplements* are formulated with a naturally-sourced vitamin D3 ingredient, and are gluten-free and non-GMO. Packaging may vary due to high demand, same great product and ingredients.
IN ORGANIC COLD-PRESSED OLIVE OIL: NatureWise Vitamin D3 is formulated with organic, cold-pressed olive oil that doesn't use heat or hexanes, to enhance the absorption of vitamin D3.*
CONTENTS CERTIFIED NSF: This supplement is NSF-contents certified, which means its contents are thoroughly tested for accuracy and purity. Ingredients are also analyzed for this certification to confirm they match label contents.
USA MANUFACTURED, 3RD PARTY TESTED: All NatureWise supplements are proudly manufactured the USA in facilities that comply to the strictest cGMP standards and undergo rigorous testing by third party labs to ensure the highest quality and purity.

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9.0

NatureWise

NatureWise Vitamin D3 2000iu (50 mcg) 1-Year Supply for Immune Support, Healthy Muscle Function, and Bone Health - Non-GMO, Gluten Free in Organic Extra Virgin Olive Oil, (Mini Softgel), 360 Count

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Main Highlights

IMMUNE, MOOD, BONE & MUSCLE SUPPORT*: Vitamin D supports healthy bones, muscle function, and a strong immune system.*
NATURALLY-SOURCED, NON-GMO: These Vitamin D3 immune support and bone health supplements* are formulated with a naturally-sourced vitamin D3 ingredient, and are gluten-free and non-GMO. Packaging may vary due to high demand, same great product and ingredients.
IN ORGANIC COLD-PRESSED OLIVE OIL: NatureWise Vitamin D3 is formulated with organic, cold-pressed olive oil that doesn't use heat or hexanes, to enhance the absorption of vitamin D3.*
CONTENTS CERTIFIED NSF: This supplement is NSF-contents certified, which means its contents are thoroughly tested for accuracy and purity. Ingredients are also analyzed for this certification to confirm they match label contents.
USA MANUFACTURED, 3RD PARTY TESTED: All NatureWise supplements are proudly manufactured the USA in facilities that comply to the strictest cGMP standards and undergo rigorous testing by third party labs to ensure the highest quality and purity.
It's normal for softgels to stick together and clump during warm weather conditions. This does NOT affect the quality or efficacy of the product. To release the clumps, give your bottle a good shake or knock it against the counter.

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8.8

Dr. Berg Nutritionals

Dr. Berg Vitamin D3 & K2 5,000 IU + MK-7 – 60 Capsules – Immune, Bone & Heart Support* Supplement w/Magnesium, Zinc, B6 – 4X Lab-Tested – No Fillers – Non-GMO, cGMP, Formulated in USA

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Main Highlights

, & : A Potent blend of vitamin D3 (5,000 IU), K2, magnesium, and zinc to help support immunity, strong bones, and cardiovascular wellness*without junk fillers.
, : 7-in-1 science-backed formulano maltodextrin, starch, gluten, or unnecessary additives. Only clean, tested ingredients for daily confidence.
, 60 : Get full support in a single daily capsuleno complicated routines, easy, reliable nutrition every day.
- & : Each batch undergoes four layers of lab verification, including third-party testing for heavy metalsso you know exactly what youre getting.
. , : Developed by a trusted health educator and backed by decades of experience and thousands of educational videos worldwideeducation, not hype.

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8.6

NOW Foods

NOW Supplements, Vitamin D-3 & K-2, 1,000 IU/45 mcg,Plus Cardiovascular Support, Supports Bone Health, 120 veg Capsules

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Main Highlights

SUPPORTS BONE HEALTH*/PLUS CARDIOVASCULAR SUPPORT*: NOW Vitamin D3 & K2 capsules combine two nutrients extensively researched for their contribution to the health of bones, teeth, and the cardiovascular system*
1,000 IU/45 mcg: Recent studies indicate that Vitamin D3 has an important function within the immune system.* Vitamin K is critical for the formation of a healthy, strong bone matrix*
CERTIFICATIONS/CLASSIFICATIONS: Non-GMO, Kosher, Soy Free
GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
Packaged in the USA by a family owned and operated company since 1968

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8.3

THORNE

THORNE - Vitamin D-5000 - Vitamin D3 Supplement - Support Healthy Bones, Teeth, Muscles, Cardiovascular & Immune Function* - NSF Certified for Sport - Gluten-Free, Soy-Free - 60 Servings

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Main Highlights

Vitamin D3 Benefits: Supports healthy teeth and bones by enhancing the absorption of calcium; supports immune function and cardiovascular health*
Optimal Absorption: Vitamin D3 (as cholecalciferol) is more potent and better absorbed than vitamin D2 (or ergocalciferol); research shows vitamin D3 is more effective at raising overall vitamin D levels*
Vitamin D for Performance: Optimizes muscle strength and cellular repair, especially in athletes who train indoors or lack adequate sun exposure to support the body's natural vitamin D production*
NSF Certified for Sport: Tested for compliance with label claims and to ensure the absence of nearly 300 substances banned by many major athletic organizations
Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners (2023 Health-Care Practitioner Seller Survey)

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8.1

Nature Made

Nature Made Vitamin D3 1000 IU (25 mcg), Vitamin D Supplement for Bone, Teeth, Muscle and Immune Health Support, 300 Softgels, 300 Day Supply

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Main Highlights

Immune, muscle, teeth and bone health support supplement: contains one 300 count bottle of Nature Made Vitamin D3 1000 IU (25 mcg) Softgels for a 300-day supply
Nature Made Vitamin D 1000 IU softgels support bone health, teeth health, muscle health, and provide immune support
These Vitamin D 1000IU softgels help improve calcium absorption and contain 25mcg of Vitamin D 3, the bodys preferred form of Vitamin D
Adults, take one Vitamin D3 softgel daily with water and a meal
Sourced from high-quality ingredients, this Nature Made Vitamin D3 supplement has no color added and no artificial flavors
#1 Pharmacist Recommended Vitamin & Supplement Brand*
These statements have not been evaluated by the Food and Drug Administration; this product is not intended to diagnose, treat, cure, or prevent any disease

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8.1

THORNE

THORNE - Vitamin D3 Supplement - Supports Healthy Bones, Teeth, Muscles, Cardiovascular & Immune Function* - Gluten, Dairy & Soy-Free - 1,000 IU - 90 Servings

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Main Highlights

Vitamin D3 Benefits: Supports healthy teeth and bones by enhancing the absorption of calcium; supports immune function and cardiovascular health*
Optimal Absorption: Vitamin D3 (as cholecalciferol) is more potent and better absorbed than vitamin D2 (or ergocalciferol); research shows vitamin D3 is more effective at raising overall vitamin D levels*
Essential Vitamin D: Optimizes performance, muscle strength and mass, and cellular repair, especially for those who work indoors or lack adequate sun exposure to support the body's natural vitamin D production*
Third-Party Certified: This product has been third-party tested and certified to verify what's in the package matches what's on the label and to confirm it contains no unsafe levels of contaminants
Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners (2023 Health-Care Practitioner Seller Survey)

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Our Best Overall Choice

Best Choice

9.7

Sports Research

Sports Research® Vitamin D3 w/Coconut MCT Oil - High Potency Vitamin D3 5000iu (125mcg) Supplement for Immune & Bone Support - Seed Oil Free - Non-GMO - Gluten Free (360 Liquid Softgels)

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

SHINE BRIGHT: Vitamin D3 helps the body absorb calcium and phosphorus - essential minerals for maintaining strong bones and teeth. It's also known as the 'sunshine vitamin', with adequate levels providing immune system support and muscular wellness so you can shine at your brightest.*
ONE-A-DAY FORMULA: Just one easy-to-swallow liquid softgel daily provides 125 mcg (5,000 iu) of high potency Vitamin D3 as cholecalciferol - the body's preferred form of Vitamin D.*
WITH COCONUT MCT OIL: Vitamin D-3 delivers the best benefits when taken with food or another source of fat, which is why we add medium chain triglycerides (MCT), the best fats from coconut oil, to our softgels to help ensure that you get the most from this essential micronutrient.*
PREMIUM QUALITY: We hold all of our supplements to a higher standard. Sports Research Vitamin D3 softgels are IGEN Non-GMO tested, and free of unwanted fillers, gluten, and seed oils such as soybean & safflower oil. Each batch is third-party tested for quality and manufactured in the USA in a cGMP-compliant facility.
THE SPORTS RESEARCH DIFFERENCE: Founded in 1980, Sports Research is a family-owned business born from a passion for fitness and wellness. Our goal is to embrace the sport of life through research-backed products created for every bodyinside and out.

Show Price

Deals are Live

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10 Best Third Party Tested Vitamin D3 of 2025

Tested and Reviewed: Top 10 Third Party Tested Vitamin D3 deals with expert ratings from 8.1 to a perfect 10

Sports Research

Sports Research® Vitamin D3 w/Coconut MCT Oil - High Potency Vitamin D3 5000iu (125mcg) Supplement for Immune & Bone Support - Seed Oil Free - Non-GMO - Gluten Free (360 Liquid Softgels)

Editor's bottom line:

Main Highlights

Sports Research

Sports Research® Vitamin D3 + K2 w/ Coconut Oil - Vegan Vitamin D 5000iu & Mk7 Vitamin K 100mcg for Bone & Immune Support - Vegan Certified · Non-GMO · Soy Free - 60 Softgels

Main Highlights

Nutricost

Nutricost Vitamin D3 5,000 IU (125mcg), 240 Softgels - Non-GMO and Gluten Free Vitamin D

Main Highlights

NatureWise

NatureWise Vitamin D3 5000iu (125 mcg) 1 Year Supply for Immune Support, Healthy Muscle Function, and Bone Health - Non-GMO, Gluten Free in Organic Extra Virgin Olive Oil, (Mini Softgel), 360 Count

Main Highlights

NatureWise

NatureWise Vitamin D3 2000iu (50 mcg) 1-Year Supply for Immune Support, Healthy Muscle Function, and Bone Health - Non-GMO, Gluten Free in Organic Extra Virgin Olive Oil, (Mini Softgel), 360 Count

Main Highlights

Dr. Berg Nutritionals

Dr. Berg Vitamin D3 & K2 5,000 IU + MK-7 – 60 Capsules – Immune, Bone & Heart Support* Supplement w/Magnesium, Zinc, B6 – 4X Lab-Tested – No Fillers – Non-GMO, cGMP, Formulated in USA

Main Highlights

NOW Foods

NOW Supplements, Vitamin D-3 & K-2, 1,000 IU/45 mcg,Plus Cardiovascular Support*, Supports Bone Health*, 120 veg Capsules

Main Highlights

THORNE

THORNE - Vitamin D-5000 - Vitamin D3 Supplement - Support Healthy Bones, Teeth, Muscles, Cardiovascular & Immune Function* - NSF Certified for Sport - Gluten-Free, Soy-Free - 60 Servings

Main Highlights

Nature Made

Nature Made Vitamin D3 1000 IU (25 mcg), Vitamin D Supplement for Bone, Teeth, Muscle and Immune Health Support, 300 Softgels, 300 Day Supply

Main Highlights

THORNE

THORNE - Vitamin D3 Supplement - Supports Healthy Bones, Teeth, Muscles, Cardiovascular & Immune Function* - Gluten, Dairy & Soy-Free - 1,000 IU - 90 Servings

Main Highlights

Our Best Overall Choice

Sports Research

Sports Research® Vitamin D3 w/Coconut MCT Oil - High Potency Vitamin D3 5000iu (125mcg) Supplement for Immune & Bone Support - Seed Oil Free - Non-GMO - Gluten Free (360 Liquid Softgels)

Editor's bottom line:

Main Highlights

Deals are Live

NOW Supplements, Vitamin D-3 & K-2, 1,000 IU/45 mcg,Plus Cardiovascular Support, Supports Bone Health, 120 veg Capsules