10 Best Best Vitamin D3 4000 Iu of 2025

Tested and Reviewed: Top 10 Best Vitamin D3 4000 Iu 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 4000 IU with Coconut MCT Oil - Double Strength Vitamin D Supplement - Gluten Free · Non-GMO · Soy Free - 360 Count Softgels

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Editor's bottom line:

“This best vitamin d3 4000 iu 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 overall wellness so you can shine at your brightest.*
ONE-A-DAY FORMULA: Just one easy-to-swallow liquid softgel daily provides 100 mcg (4000 iu) of high potency Vitamin D3 as cholecalciferol - the body's preferred form of Vitamin D.*
WITH COCONUT MCT OIL: Vitamin D3 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 Southern California 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

NatureWise

NatureWise Vitamin D3 4000iu (100 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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9.5

NatureWise

NatureWise Vitamin D3 4000iu (100 mcg) 200-Day Supply for Immune Support, Healthy Muscle Function, and Bone Health - Non-GMO, Gluten Free in Organic Extra Virgin Olive Oil, (Mini Softgel), 200 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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9.2

NatureWise

NatureWise Vitamin D3 4000iu (100 mcg) 90-Day Supply for Immune Support, Healthy Muscle Function, and Bone Health - Non-GMO, Gluten Free in Organic Extra Virgin Olive Oil, (Mini Softgel), 90 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

Carlson

Carlson - Vitamin D3, 4000 IU (100 mcg), Vitamin D Supplements, Bone & Immune Health, Cholecalciferol Supplement, Gluten Free Vitamin D Capsules, 120 Softgels

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Main Highlights

BONE HEALTH AND IMMUNE FUNCTION - Carlson Vitamin D3 softgels are the preferred form of vitamin D that's important for promoting strong bones and supporting immune system health.
SUPPORT IMMUNE HEALTH - Vitamin D 4,000 IU (100 mcg) softgels helps boost our immune system and create a healthy immune balance.
PROMOTE HEART AND MUSCLE HEALTH - Vitamin D3 plays an important role in promoting heart function and supporting muscle health.
VITAMIN D3 4,000 IU (100 MCG) - A single softgel provides 4,000 IU (100 mcg) of vitamin D3 as cholecalciferol.
QUALITY GUARANTEED SINCE 1965 - All Carlson products are tested by an FDA-registered laboratory for potency and quality.
During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided.

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8.8

WeightWorld

WeightWorld Vegan Vitamin D3 4000 IU Tablets - 400 Count - D3 Vitamin for Bone & Immune Health - (13+ Months Supply) - High Potency Vegan D3 for Women & Men - GMP-Approved - Gluten-Free - Non-GMO

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Main Highlights

VITAMIN D3 FOR BONE & IMMUNE HEALTH: Many people in the US don't get enough sun exposure, making vitamin d supplements an important part of day-to-day life. Our high-potency vit d3 tablets support normal bone health and immune health. A steady dose of vitamin d 4000 iu offers reliable coverage for modern indoor lifestyles with long work hours and limited sun exposure, giving you balanced nourishment and consistent d3 vitamin intake as part of your everyday lifestyle.
VEGAN VITAMIN D3 SOURCED FROM LICHEN: WeightWorld's vitamin d3 4000 iu tablets are made with plant-based cholecalciferol derived from lichen, this vitamin d3 vegan source is suitable for anyone looking for a plant-derived option. It offers steady daily support through vegan vitamins d3, making it a flexible choice for all lifestyles. Whether you prefer plant-based products or simply want a vitamin d vegan option, this vegan d3 formula fits easily into wide range of lifestyles.
COMPLETE 13-MONTH SUPPLY: Our vitamins d3 cholecalciferol delivers 400 tablets - one tablet per day gives you 13 months of dependable vitamin d 4000 iu supply, fitting smoothly into your everyday life. Our vitamin d supplements formulation provides a better vit d3 coverage and a practical way to maintain steady d3 vitamin levels from a single daily serving. Unlike vitamin d3 4000 iu softgels that can melt or turn sticky in hot weathers, our tablets stay stable, are easy to store, and fuss-free.
THIRD-PARTY TESTED & GLUTEN-FREE: WeightWorld's vegan vitamin d3 formula is GMP-approved, non-GMO, magnesium stearate-free, and third-party tested for added assurance. Our vitamin D3 4000 iu are also gluten-free, lactose-free, soy-free, and made without artificial flavors. These vitamin d vegan tablets are dependable, making them a strong and reliable choice among many vitamin d3 supplements. Our vitamin d3 for men and women tablets are convenient option for everyday use.
INTRODUCING WeightWorld: Founded in 2006 from a passion for dietary supplements, what began as a small, family-run brand in the UK has grown into a well-established name across global marketplaces. With nearly two decades of helping people around the world feel their best, we offer a wide range of vitamins, minerals, plant-based supplements, and devices. WeightWorld continues to expand while staying true to its mission of supporting everyday health through thoughtful, science-backed nutrition.

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8.6

YounGlo Research

YounGlo Research Vitamin D3 4000 IU Dietary Supplement to Promote Healthy Bone & Immune Function, Easy-to-Swallow 360 Softgels

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Main Highlights

HIGH POTENCY - With 500% of the daily value, this fat-soluble vitamin with olive oil can help to provide greater absorption by the body
GMP CERTIFIED - This non-GMO vitamin is free of dairy, gluten, sugar, and stearates; Plus, we have GMP certification
BENEFITS - Vitamin D3 may help the body absorb calcium to strengthen bones and stimulate T-cell production to support the body's natural defenses
360 SOFTGELS - A full year supply for year-round health support
TRIED AND TESTED - YounGlo Research uses its extensive knowledge in nutritional research and selects quality ingredients with a cooking formula to create a recipe for dehydrated, powdered bone broth in which you'll be 100% satisfied

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8.3

Carlson

Carlson - Vitamin D3 4000 IU (100 mcg), Immune Support, Bone Health, Muscle Health, Cholecalciferol, Vitamin D Supplements, Vitamin D3 Soft Gels, 360 Softgels

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Main Highlights

BONE HEALTH AND IMMUNE FUNCTION - Carlson Vitamin D3 softgels are the preferred form of vitamin D that's important for promoting strong bones and supporting immune system health.
SUPPORT IMMUNE HEALTH - Vitamin D 4,000 IU (100 mcg) softgels helps boost our immune system and create a healthy immune balance.
PROMOTE HEART AND MUSCLE HEALTH - Vitamin D3 plays an important role in promoting heart function and supporting muscle health.
VITAMIN D3 4,000 IU (100 MCG) - A single softgel provides 4,000 IU (100 mcg) of vitamin D3 as cholecalciferol.
QUALITY GUARANTEED SINCE 1965 - All Carlson products are tested by an FDA-registered laboratory for potency and quality.

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8.1

NatureWise

NatureWise Vitamin D3 4000IU + K2 (MK7) 100mcg with Organic Extra Virgin Coconut Oil - Supports Calcium Absorption, Bone & Immune Health - Non-GMO, Soy & Gluten-Free - 90 Softgels[3-Month Supply]

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Main Highlights

3rd PARTY TESTED: NatureWise D3 + K2 Softgels are manufactured in the USA with high-quality ingredients from around the world in a cGMP-certified facility with third-party quality control audits.
D3 + K2: NatureWise offers a 2-in-1 vitamin D3 + K2 with D3 as pure cholecalciferol and top-quality natto fermented K2 in menaquinone MK-7 form (soy-free).
BONE & HEART HEALTH: Vitamin D3 helps our bodies to absorb dietary calcium. Vitamin K2 helps the body use this calcium effectively - contributing to bone health and strength while supporting heart health.*
ORGANIC COLD-PRESSED COCONUT OIL: Our softgels are packed with organic cold-pressed (aka. extra virgin) coconut oil which helps the body absorb these fat-soluble vitamins easier.
HALAL GELATIN, CLEAN INGREDIENTS: NatureWise D3 + K2 Softgels are non-GMO, made with halal gelatin, and do not contain wheat, gluten, eggs, soy, milk, peanuts, fish, shellfish, or sesame. Does contain tree nuts (coconut oil).

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8.1

WeightWorld

WeightWorld D3 Vitamin 4000 IU + K2 125mcg | Vitamin D3 K2 for Healthy Bones & Immune Support (8-Month Supply) | 240 Vegan D3K2 Tablets | Plant-Based VIT D3 & K2 (MK-7) | Gluten-Free, Non-GMO

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Main Highlights

VITAMIN D3K2 FOR HEALTHY BONES & IMMUNE SUPPORT: Our thoughtfully crafted Vitamin D3 K2 tablets combine two key nutrients that work together - Vit D3 helps the body use calcium, while Vitamin K2 (MK-7) helps guide calcium to bones where it's needed most. This balanced Vitamin D and K2 approach supports bone strength & immune health, making it a reliable daily K2 D3 Vitamin supplement option for colder months, indoor lifestyles, limited sun exposure and low D Vitamin levels.
VEGAN VITAMIN D3 WITH K2 125MCG: Our Vitamin D3 K2 formula uses plant-based vitamin d3 cholecalciferol sourced from lichen, offering a vegan alternative to animal-derived Vit D3 and K2 supplements. Our Vitamin D 4000 IU is paired with Vitamin k2 Menaquinone-7 - a form that lasts longer in the body. Our vegan D3K2 delivers 125mcg of K2, unlike many Vitamin D3 and K2 supplements that provide only 50 - 100mcg. A synergistic Vitamin K2 D3 combo for optimal calcium absorption.
240 TABLETS, 8 MONTHS D3 K2 SUPPLY: Our Vitamin D3 4000 IU + K2, delivers 100mcg of Vitamin D3 along with 125mcg of Vitamin K2. With 240 tablets per bottle and just one tablet a day, our vegan Vitamin D with K2 formula offers a full 8-month supply, fitting smoothly into a sustained nutrition plan. Our Vitamin D3 and K2 supplements provide a practical way to maintain steady Vitamin D K2 levels from a single daily serving.
NON-GMO & GLUTEN-FREE: WeightWorld's K2 D3 Vitamin Supplements are non-GMO and FDA-registered. Our Vitamin D3 + K2 tablets are also free of gluten and artificial flavors. Unlike Vitamin D3 4000 IU softgels that melt & turn sticky in hot weather and Vitamin D3 K2 gummies loaded with sugar, our Vitamin D and K tablets stay stable, fuss-free and have no artificial sweeteners. Our vegan Vitamin D3 and K2 tablets easily fit into a wide range of lifestyles & are a convenient option for everyday use.
INTRODUCING WeightWorld: Founded in 2006 from a passion for dietary supplements, what began as a small, family-run brand in the UK has grown into a well-established name across global marketplaces. With nearly two decades of helping people around the world feel their best, we offer a wide range of vitamins, minerals, plant-based supplements, and devices. WeightWorld continues to expand while staying true to its mission of supporting everyday health through thoughtful, science-backed nutrition.

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Our Best Overall Choice

Best Choice

9.7

Sports Research

Sports Research® Vitamin D3 4000 IU with Coconut MCT Oil - Double Strength Vitamin D Supplement - Gluten Free · Non-GMO · Soy Free - 360 Count 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 overall wellness so you can shine at your brightest.*
ONE-A-DAY FORMULA: Just one easy-to-swallow liquid softgel daily provides 100 mcg (4000 iu) of high potency Vitamin D3 as cholecalciferol - the body's preferred form of Vitamin D.*
WITH COCONUT MCT OIL: Vitamin D3 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 Southern California 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

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