The Best Vitamin D Supplements of 2026: How to Choose and More

When deciding on the best vitamin D supplements, we worked with a certified nutrition coach to test more than 140 different products, then settled on five that we felt were the best fit for demanding lifestyles and health goals. Whether your aim is to stay ahead at work, bolster your resilience, or simply maintain peak daily performance, we’ve got your vitamin D needs covered.

Why Trust Fortune

Our team of expert testers has tried hundreds of the most popular supplements on the market today, using our comprehensive supplement testing methodology to find the best products for all folks. 

Best Vitamin D Supplements of 2026

• Best Vitamin D Supplement Overall: Transparent Labs Vitamin D3 + K2
• Best Vitamin D K1 Supplement: Legion Vitamin D+K
• Best Vitamin D K2 Supplement: Nutricost Vitamin K2 + Vitamin D3
• Best High Dose Vitamin D Supplement: Sports Research Vitamin D3

Best Vitamin D Comparison Table

Vitamin D	Vitamin D Per Serving	Form	Serving Size	Additional Ingredients
Transparent Labs Vitamin D3 + K2	5,000 IU	Vegan softgels	1 softgel	Vitamin K2
Legion Vitamin D+K	2,000 IU	Capsules	1 capsule	Vitamin K1, vitamin K2
Nutricost Vitamin K2 + Vitamin D3	5,000 IU	Softgels	1 softgel	Vitamin K2
Sports Research Vitamin D3	5,000 IU or 10,000 IU	Softgels	1 softgel	Coconut MCT oil

Transparent Labs Vitamin D3 + K2
Vitamin D Per Serving	5,000 IU
Form	Vegan softgels
Serving Size	1 softgel
Additional Ingredients	Vitamin K2
Legion Vitamin D+K
Vitamin D Per Serving	2,000 IU
Form	Capsules
Serving Size	1 capsule
Additional Ingredients	Vitamin K1, vitamin K2
Nutricost Vitamin K2 + Vitamin D3
Vitamin D Per Serving	5,000 IU
Form	Softgels
Serving Size	1 softgel
Additional Ingredients	Vitamin K2
Sports Research Vitamin D3
Vitamin D Per Serving	5,000 IU or 10,000 IU
Form	Softgels
Serving Size	1 softgel
Additional Ingredients	Coconut MCT oil

Best Vitamin D Supplement Overall: Transparent Labs Vitamin D3 + K2

Our Thoughts on Transparent Labs Vitamin D3 + K2

Transparent Labs Vitamin D3 + K2 is our pick as the best overall vitamin D supplement because it pairs two highly effective nutrients, both essential to optimal health, in their most absorbable forms. With a vegan, allergen-free formula, rigorous third-party testing, and a dosage that meets the needs of those with above-average requirements, it offers a premium, science-driven solution. 

Pete tested this supplement and rated his first impression of the product a 5 out of 5. “This supplement comes in a white plastic bottle with a smooth screw-top lid that opens and closes easily,” he said. “The white label has navy and black lettering that’s easy to read. All key product details are clearly displayed, and the inclusion of the Informed Choice certification is shown on the front of the label.”

He found the directions straightforward and easy to follow: “It says to take one softgel one to two times a day with a meal containing fats,” Pete said, rating the instructions a 5 out of 5. While the specification that the meal contain fats might seem inconvenient, vitamin D is a fat-soluble vitamin, which means it’s best absorbed with fats, so there’s a solid reason behind the instructions. Our tester also liked that Transparent Labs’ softgel capsules are small and easy to swallow, especially considering it’s only one capsule per serving. 

Our tester didn’t experience any taste when testing this supplement, nor did he have any side effects, rating it a 5 out of 5 in this category. Overall, Pete was pleased that Transparent Labs advises taking the softgel with a meal that contains dietary fat to support proper absorption. “This supplement is a solid option for anyone looking to boost or maintain higher vitamin D levels, especially if they don’t get a lot of sun exposure, such as during the winter months. I also like that the product is third-party tested, which adds an extra layer of trust and transparency,” he said.

Best Vitamin D K1 Supplement: Legion Vitamin D+K

Our Thoughts on Legion Vitamin D+K

We chose Legion Vitamin D+K as the vitamin D supplement with the best ingredients because of the presence of K1 and K2. Our tester Pete, a certified nutritionist, explained that “these vitamins all work in tandem to support overall health. Vitamin D helps your body absorb calcium, which supports bone health and immune function, while vitamin K2 plays an important role in directing the calcium into the bones.” As for vitamin K1, studies show it assist with blood clotting.

All of these ingredients are powdered and stored in a clear capsule that Pete noted was of average size (about 1 inch in length and 1/2 a centimeter in diameter). The instructions say to take one capsule a day with food, and Pete noted that it had no taste and was easy to swallow.

Pete ended up giving Legion Vitamin D+K a perfect score of 5 out of 5 for both first impression and instructions/ease of use. “It comes in a compact black plastic container with a screw-top lid that opens and closes easily,” he said. “The label features a black and light yellow design with clear, easy-to-read text, and the bottle’s small size makes it convenient for travel.”

While Pete’s experience with Legion Vitamin D+K was a positive one, he clarified that he would have to get bloodwork done over a longer period of time to confirm any measurable changes in his vitamin D levels. But that’s the case with any supplement on this list. We should also point out that, even though this product is affordable, its price per serving is slightly more expensive than the other products we tested.

Best Vitamin D3 K2 Supplement: Nutricost Vitamin K2 + Vitamin D3

Our Thoughts on Nutricost Vitamin K2 + Vitamin D3

Nutricost’s Vitamin K2 + Vitamin D3 is our pick for the best combination K2 and D3 supplement thanks to its clinically effective dosages of both nutrients, excellent value, and trusted third-party testing for safety and efficacy. By providing 5000 IU of D3 and 100 mcg of K2 (MK-7) in a single, easy-to-swallow daily softgel, it addresses two of the most crucial vitamins for bone density and cardiovascular function.

Kate tested this vitamin D supplement, rating her first impression of the product a 5 out of 5. “The bottle has typical Nutricost branding. It is very clearly labeled and easy to understand what the product is,” she said. It’s a regular twist-off bottle, so she found it super easy to open and close. “The bottle isn’t as small as some of the other vitamin D bottles I’ve tested, but it could still fit in a larger purse or backpack,” she said.

She rated swallowability a 5 out of 5, saying: “These softgels are very tiny! They are smaller than penny. They were very easy to swallow, and since I only had to take one, I had no issues with it!”

Kate did notice a bit of a taste to these softgels, rating that factor a 3 out of 5. “You can really smell the softgels when you first open the bottle–they smell and taste a bit funky. It’s not overwhelming at all, especially since the softgels are so small,” she said. This didn’t bother Kate, but it could bother folks who are sensitive to taste and smell when taking a supplement.

Our tester didn’t experience any side effects after taking this supplement. Overall, Kate thinks this is a great neutral product for someone who is looking to increase their vitamin D intake. “It’s cost efficient and reviewers didn’t seem to have many, if any, side effects from it,” she said.

Best High Dose Vitamin D Supplement: Sports Research Vitamin D3

Our Thoughts on Sports Research Vitamin D3

Sports Research Vitamin D3 stands out as the best high-dose supplement due to its exceptional potency, ease of use, and quality assurance. Our tester tried the 5,000 IU softgel, which required just one pill per day, but the 10,000 IU version is identical in appearance and taste—still one softgel daily, making it a simple switch if a higher dose is needed. We love the inclusion of organic coconut MCT oil for enhanced absorption, and the product is non-GMO and third-party verified. We recommend talking with your doctor before starting any supplement, but especially if you are considering a high potency supplement such as this one.

Kate tested this supplement, rating her first impression of the product a 5 out of 5. “The Sports Research branding is great: the black matte bottle with a flip top is appealing both visually and when opening the bottle,” she said. “It’s very easy to tell what the product is, and its clearly labeled in white font.” However, Kate noted that this is the largest bottle out of all the vitamin D she’s tested, and is not travel-friendly.

Our tester rated the swallowability a 5 out of 5, praising how small the pill is. “It’s smaller than my pinky nail, which made it super easy to swallow. It is a softgel, which added to the comfort when taking it. It has a clear, yellowish tint to it and is striking against the black container, which I enjoy. You only need to take one softgel per day, so it is very easy to consume,” she said.

Kate found the smell and taste to be slightly fishy but still rated it a 5 out of 5 in this category. “It tastes a bit sour when it sits on your tongue, but the taste quickly goes away once you swallow the softgel with water. I didn’t notice an aftertaste at all,” she said.

Overall, she thinks this is a good product to take for a cost efficient and large dose of vitamin D. “Since it’s extra strength, it’s important to check with your doctor to see if this is the right dosage and product for you due to possible side effects,” Kate said. She loves that you get nearly a year’s supply in one bottle, 360 servings, for only $17.95.

What is a Vitamin D Supplement?

A vitamin D supplement is a product designed to help you meet your daily vitamin D needs, especially if you cannot get enough from sunlight or diet alone. It supports bone health, immune function, and overall wellness by providing a concentrated source of vitamin D in convenient pill, capsule, powder, or liquid forms.

Forms

Vitamin D supplements come in two primary forms: vitamin D2 (ergocalciferol), derived from plants and fungi, and vitamin D3 (cholecalciferol), synthesized from animal sources or produced naturally in your skin by sunlight exposure. Vitamin D3 is generally considered the more effective form for raising and maintaining blood vitamin D levels, while D2 may be preferred for a vegan lifestyle.

How We Tested and Selected the Best Vitamin D Supplements

When choosing top vitamin D supplements, we collaborated closely with a Registered Dietitian (RD) to ensure our testing focused on safety, effectiveness, and clinical backing. Formulas selected provide at least 100% of the recommended daily value (RDV) for vitamin D, and each product avoids artificial sweeteners, colors, and unnecessary additives.

Formula

Partnering with an RD strengthens our commitment to finding supplements with clinically supported dosages and thoughtful ingredient profiles. Specific to vitamin D, we select formulas that guarantee at least 100% RDV and steer clear of artificial ingredients.

Swallowability

We prepare each vitamin D product according to the manufacturer’s instructions and pay attention to how well the product dissolves, especially with powders. Avoiding gritty textures and off-putting taste ensures a better experience for routine daily use.

Third-Party Testing

Our team prioritizes products with third-party testing, such as NSF or USP certification. Third-party testing means the product has been independently analyzed for accuracy and purity, reducing the risk of contaminants or mislabeling. Since the FDA does not regulate most supplements as strictly as medications or foods, outside verification is crucial for consumer safety.

Value

In our evaluation process, we balance effectiveness, safety, ingredient quality, swallowability, and price to determine best-value vitamin D supplements. This approach ensures you get the most reliable product for your investment.

Vitamin D	Vitamin D amount	Price per serving
Transparent Labs Vitamin D3 + K2	5,000 IU	$0.50
Legion Vitamin D+K	2,000 IU	$0.67
Nutricost Vitamin K2 + Vitamin D3	5,000 IU	$0.16
Sports Research Vitamin D3	5,000 IU or 10,000 IU	$0.05

Transparent Labs Vitamin D3 + K2
Vitamin D amount	5,000 IU
Price per serving	$0.50
Legion Vitamin D+K
Vitamin D amount	2,000 IU
Price per serving	$0.67
Nutricost Vitamin K2 + Vitamin D3
Vitamin D amount	5,000 IU
Price per serving	$0.16
Sports Research Vitamin D3
Vitamin D amount	5,000 IU or 10,000 IU
Price per serving	$0.05

How to Find the Best Vitamin D Supplements for You

Vitamin D is essential for bone health, immune function, and muscle performance, but many people struggle to get enough from sunlight or diet alone. Supplements can help bridge the gap, but the best option depends on your individual needs and goals.

Your Fitness Goals

Athletes and active individuals have unique vitamin D requirements compared to the general population. For example, runners may focus on bone strength for injury prevention, while strength athletes might emphasize muscle function and recovery. Knowing your specific fitness goals—whether it’s improving performance, reducing injury risk, or supporting recovery—can help guide your search for the right supplement.

Formula

Before purchasing a vitamin D supplement, review ingredient lists to check for allergens or additives that could interact with your dietary preferences or restrictions. Some formulas offer vitamin D2 (ergocalciferol), while others provide vitamin D3 (cholecalciferol), which is generally more effective at raising blood vitamin D levels. 

Cost

Supplements range in price, and cleaner formulas with fewer fillers are often more expensive. Investing in a quality supplement can pay off in the long run if you plan to use it daily. Weigh cost against quality—higher prices usually reflect better sourcing, purity, and potency, which can be particularly important for something you’ll be taking regularly.

Third-Party Testing

Prioritize supplements that have been tested by independent, third-party organizations (such as NSF or USP). This ensures the product contains what it claims, is free of harmful contaminants, and meets quality standards. For serious athletes, third-party certification can also provide reassurance that the product is free from banned substances.

Benefits of Vitamin D Supplements

Vitamin D delivers several performance and health benefits, especially for people at risk of deficiency or those with increased needs due to high training loads:

• Helps maintain strong bones, reducing fracture risk. 
• Enhances muscle strength and supports better muscle function. 
• May reduce recovery time and injury risk in athletes. 
• Boosts immune system function, lowering rates of illness among athletes. 
• Contributes to reduced inflammation and improved mood.

How to Take Vitamin D Supplements

The optimal intake of vitamin D varies widely. General guidelines recommend 600 to 800 IU per day for most adults, but athletes, individuals with limited sun exposure, or those who are already deficient may need higher doses under medical supervision. 

Blood tests are the gold standard for assessing your vitamin D status—discuss supplementation with your doctor, particularly if you have specific health conditions or are on other medications. Common signs of vitamin D deficiency include fatigue, muscle weakness, bone pain, and frequent illness.

Can You Take Too Much Vitamin D?

Yes, taking too much vitamin D can be harmful. The tolerable upper intake level is typically set at 4,000 IU per day for adults, but toxicity is rare and usually associated with chronic intake of very high doses. Symptoms of vitamin D toxicity may include nausea, vomiting, weakness, and kidney problems. Always stick to dosing guidelines and talk with your doctor for personalized recommendations.

What to Avoid in Vitamin D Supplements

When picking a supplement, avoid:

• Excessive or unclear dosing 
• Products lacking third-party certification
• Artificial additives, fillers, or allergens that could pose health risks

Frequently asked questions

What is the most effective vitamin D to take?

Vitamin D3 (cholecalciferol) is generally considered the most effective form for raising and maintaining blood vitamin D levels.

What are the most common mistakes people make when taking vitamin D supplements?

Two of the most common mistakes people make when taking vitamin D supplements are: taking too little or too much without doing bloodwork first, and choosing poor-quality supplements without third-party testing.

Can vitamin D deficiency cause itchy rash?

Vitamin D deficiency is not a common cause of itchy rashes, but it can contribute to immune dysfunction, which may indirectly affect skin health. We recommend talking with your doctor if you are experiencing skin issues.