Best Vitamin D3 and K2 Supplement Brands: A Complete Buyer’s Guide

The synergistic role of fat-soluble vitamins D3 and K2 is well studied for skeletal and cardiovascular wellness. Vitamin D plays an important role in calcium metabolism, while vitamin K, particularly the K2 form, may help ensure that the calcium gets deposited in bones and not in soft tissues. 

A healthy diet and lifestyle form the foundation for your nutrition status. But, some internal and external factors may not allow you to get all the nutrients you need from food alone and your healthcare practitioner may suggest supplement options. If you need vitamin D3 and K2, there are multiple options from different brands in various price ranges. You can get true value for your money and get the intended benefits only when you choose high-quality formulations created by brands that focus on purity, stability, and professional formulation integrity. We’ve compiled the best professional-grade supplement brands for the vitamin D3 and K2 combination trusted by practitioners. 

What You Should Know Before Choosing Vitamin D3 and K2 Supplement Brands

Individual vitamin D and K needs vary. For example, if someone lives in sunny areas, they may get enough vitamin D from the sun compared to those who live in cold regions. Also, skin tone, genetics, and nutritional status determine how much vitamin D you need to consume. Similarly, K supports natural blood clotting mechanisms that vary with the person. Before looking at options for vitamin D3 + K2 brands, keep these pointers in mind:

• Existing medication check: If you are prescribed blood thinners, you should avoid combined D3K2 supplements unless they are explicitly approved by your doctor. If you take other medications, consult with your healthcare provider and take them 4 to 6 hours apart from those medications. 
• Multi-nutrient overlap: You should be cautious with your choice if you already take other multivitamins and supplements that give you vitamin D and K. Only a medical professional can determine if you need additional D3 and K2 supplements because they can order tests for routine checking of vitamin D levels and guide you on choosing the right dosage that matches your personal optimal needs. 

How to Read the Labels Right with Vitamin D3 and K2 Supplements?

Transparent brands clearly mention how much D3 and K2 are present per serving, along with their source. While the actual amount may differ from one supplement to another, knowing how to read the labels right can help in making the right choice for your needs:

Understanding Vitamin D3 Dosage

If you look at the best vitamin D3 and K2 supplement brands, you will notice that they offer different potencies. The biological activity of D3, represented as IU (International Units), says more about the potency rather than the physical weight. 

Generally, supplements formulated for daily maintenance contain 1,000 IU to 2,000 IU of vitamin D3. High to mega dosages may range from 3,000 IU to 25,000 IU or more, which may be recommended by healthcare practitioners to those who have a clinically diagnosed vitamin D deficiency. You should never choose a high dose or mega dose supplement without consulting your doctor. 

Vitamin K2 Dosage and Forms

When vitamin D3 is paired with K2, you can find that brands include 45 mcg to 100 mcg or more of K2 along with Vitamin D3. There is no universal medical ratio set by the regulatory bodies and brands scale K2 relative to D3. Again, the individual needs of K2 vary. 

Vitamin K2 in the supplement may be present in MK-7 (Menaquinone-7) or MK-4 (Menatetrenone) form. Both are active forms of K2, but MK-4 has a short biological half-life compared to MK-7. MK-7 stays in the bloodstream for longer and supports sustained vitamin K2 levels. Depending on the brand, the source of MK-7 may vary. The choice between MK-4 and MK-7 also depends on what your body needs, and your healthcare practitioner can guide you. 

Now that you understand how to choose the supplements, here are our top picks:

Why These 7 Best Brand Vitamin D3 And K2 Supplements Stand Out

Below, we give you our top choices for vitamin D3 and K2 supplement companies. We prioritized brands that adhere to cGMP manufacturing standards and conduct third-party testing. We’ve vetted these brands based on label transparency and exclusion of unnecessary fillers, binders, additives, preservatives, or sweeteners. 

Pure Encapsulations

Pure Encapsulations is a practitioner-grade supplement brand known for hypoallergenic formulations. The brand strictly eliminates unnecessary additives, fillers, or preservatives. The Pure Difference is that their formulations have only what you need and nothing you don’t need. Practitioners who want to choose supplements for sensitive individuals require clean ingredient transparency and Pure Encapsulations meets their needs. 

The Vitamin D3 and K2 supplements from this brand use stable Menaquinone-7 (MK-7). The formulations also include clean cholecalciferol and use hypoallergenic cellulose for the capsules. The capsules provide a high potency ratio of 4000 IU of vitamin D3 and 100 mcg of vitamin K2. Another formula contains 1000 IU of D3 with a higher dose of K2, 240 mcg. 

If you prefer an alternative option with a lower dose, a liquid supplement is also available from this brand. The micellization process results in tiny droplets that maximize nutrient uptake.  

Another formulation from Pure Encapsulations provides both K1 and K2 forms of vitamin K along with vitamin D3 for wide-spectrum bone mineralization support. 

Pure Encapsulations maintains high-quality standards through third-party testing. The supplements are manufactured in NSF-GMP-registered facilities. It is included in our list of the best brands for vitamin D3 and K2 supplements as they are certified gluten-free and non-GMO project verified. 

Pros

• Hypoallergenic focus considering the needs of people with sensitivities or allergies 
• No unnecessary lubricants or binders 
• Liquid formulation uses microscopic micellization technology 

Cons

• No low-dose options in capsule form 
• Premium pricing 

User Reviews: Consumers keep coming back to Pure Encapsulation supplements because the brand has no hidden flow agents, corn derivatives, or binders, which are an important consideration for those with food allergies. 

Thorne

Throne is a precision-focused brand, which is a supplement partner brand for many US National teams. It also collaborates directly with Mayo Clinic. 

Thorne provides a liquid D3/K2 formula using a clean medium-chain triglyceride (MCT) oil base. While Pure Encapsulations uses only MK-7, Throne uses menatetrenone form, which is also studied to be active in bones, tissues, and blood vessel walls. The liquid dosing is flexible, as you can scale up or down by counting drops. A single serving of 2 drops gives you 1000 IU vitamin D3 and 200 mcg vitamin K2. The liquid supplement is NSF Certified for Sport.  

If you need a capsule option, Throne doesn’t provide one with the D3 + K2 combination, but you can stack supplements separately. Thorne is one of the premium brands that doesn’t use the flowing agent magnesium stearate. 

The company is known for clinical-grade supplements that are designed to support performance. They control their entire manufacturing process end-to-end. Every product undergoes 4 rounds of in-house testing for raw materials, in-process, finished product, and stability and expiration testing. It holds Australia’s TGA certification, one of the strictest regulatory standards. In addition,  

Pros

• Provides a convenient liquid formulation 
• A single bottle may contain up to 600 servings, making it highly cost-effective

Cons

• No standalone capsule form that gives both D3 and K2

User Reviews: Thorne users feel that they prefer the MCT Oil base liquid supplement that is easier to take and offers excellent value because a single bottle can last for 6 to 12 months. At the same time, the dropper may pour slowly. 

Now Foods

NOW Foods makes high-quality, premium supplements financially accessible for everyone. The company’s massive scale of operations doesn’t result in a quality drop with industry-leading, multi-million-dollar, in-house testing infrastructure. The highlight of this facility is gas chromatography, which verifies the structural integrity of ingredients used in NOW Foods supplements. 

NOW Foods doesn’t outsource testing. As many as 16,000 tests are conducted in-house to ensure purity and quality. The company has UL Dietary Supplement certification, Underwriters Laboratories NPA A-rated GMP Certification, and Non-GMO Project verified certification. 

Our list includes NOW Foods as one of the best brand vitamin D3 and K2 supplements mainly because of the varied options that the brand provides. If you are looking for a high-dose option, a 5000 IU D3 and 90 mcg K2 option is available. With just a single chewable tablet, you can get these high-dose vitamins. For a slightly lower dose option, liquid drops provide 2,500 IU and 100 mcg K2. While 5 drops constitute a single serving, you can customize the dosage of the liquid supplement. 

A mega dose option provides 5000 IU D3 and 180 mcg K2 in a single capsule form. The one containing D3, K2, and Calcium provides comprehensive bone support. For daily bone support, a simpler option is available that provides a lower dose of vitamin D3 and K2 in MK-4 form, while the other options use MK-7 form. 

Pros

• Contains supplement options for various needs, ranging from low-dose daily support to a mega dose 
• Offers D3/K2 supplements in multiple forms: capsules, chewables, and liquid drops
• You can choose supplements with MK-4 or MK-7 based on your needs
• Highly cost-effective per serving

Cons

• The liquid formula has a strong mint flavor

User Reviews: Users prefer the simplicity of NOW Foods as it offers a daily 1,000 IU D3 dosage that may be useful as a daily supplement. 

Inwell Biosciences

Inwell Biosciences creates supplements that are aimed at supporting those with significant nutrient deficiencies. It’s a practitioner-first brand that focuses on high-potency designs. All supplements are manufactured in FDA-registered, cGMP-certified facilities in the USA. Raw materials are first tested thoroughly to ensure they have clinical potency before they are formulated. 

Practitioner-exclusive brand means that the formulation targets metabolic, structural, and cellular health pathways to support clinical protocols. Functional medicine experts are part of the team that creates synchronized nutrient ratios. 

Inwell Biosciences brand isn’t for someone who is looking for daily support because the D3 and K2 options available from this brand are a high dose 5000 IU D3 + 180 mcg K2 or a mega dose 10,000 IU D3 + 100 mcg K2. Both options use the MK-7 form. Such high doses must be taken only when monitored by a healthcare professional. 

Pros

• Offers a huge mega dose option
• Supports practitioner protocols

Cons

• Only available through practitioner channels
• No daily support option 

User Reviews: Users say that the high IU dose helps them improve vitamin D levels as recommended by their doctors. But the practitioner-channel approach means that the availability is limited. Also, the bovine gelatin softgel is not suitable for vegetarians.

Vital Nutrients

Vital Nutrients is another consumer-focused brand in our list of the best brands for vitamin D3 and K2 supplements. They don’t compromise on testing, and every single raw material batch is tested thoroughly. They also test every batch of supplements for 180 contaminants. 

The company simplifies the choices as it provides a D3 + K2 supplement for daily support offering 1000 UI D3 and 150 mcg of K2 in MK-7 form, suitable for vegetarians. You get all of it from a single capsule. If you are looking for a quick and simple option to include these vitamins in your daily diet, Vital Nutrients is one of the high-quality options. For someone who needs a comprehensive bone support, the Osteo Nutrients formulations from this brand provide formulations with higher doses of calcium, magnesium, boron, and other ingredients, along with vitamins D3 and K2. 

Pros

• High-quality testing commitment
• Offers a simple option for daily support 

Cons

• Premium pricing 
• Should be careful with a multi-ingredient D3 and K2 vitamin option if you already take a multivitamin 

User Reviews: Users like the comprehensive formulation for overall bone support. But, they report that they find it harder to swallow many pills to meet the required dosage per day. 

Allergy Research Group

Allergy Research Group specifically formulates supplements for those with high sensitivities. So, if you can’t compromise on hypoallergenic ingredients, ARG can be a natural choice. For 40 years, they have created formulations using synergistic ingredients, considering the needs of people with intolerances. 

ARG works under strict cGMP standards and uses independent third-party laboratories for purity verification and allergen exclusion. Consumers who are looking for non-reactive and bioavailable formulas often lean towards ARG. 

When you are looking for D3 + K2 formulations with other mineral ingredients, ARG has a few options ranging from low dosage, such as 1000 IU D3, to mega doses, such as 25,000 IU per serving. But their daily formulations don’t contain just D3 and K2. In every formulation, additional ingredients like Vitamin A, C, and minerals like calcium, magnesium, boron, etc., are present. These are included to provide a more comprehensive support. If your doctor has recommended a higher dosage of vitamin D and K combination based on your specific needs, ARG offers a 25,000 IU D3 + 45 mcg K2 as MK-7. Ensure that you take high-dose options under the guidance of a healthcare professional. 

We include ARG in our list of the best brand vitamin D3 and K2 supplements because of its differentiating addition of DeltaGOLD® tocotrienols in some formulations to support absorption of the fat-soluble vitamins. 

Pros

• Hypoallergenic formulations
• Multiple options with different dosages per serving

Cons

• Limited options that contain only D3 and K2
• Premium pricing 

User Reviews: Some users prefer the inclusion of other vitamins and minerals along with D and K in ARG supplements because they don’t have to track other nutrients separately. But those who already take a multivitamin and other supplements find it challenging to arrive at the right dosage that doesn’t increase the risk of vitamin A toxicity. 

Metagenics

Metagenics is another practitioner-oriented brand in our top rated companies for Vitamin D3 and K2 supplements. The brand creates formulations that work with clinical protocols. Backed by a massive internal scientific advisory board, the company creates supplements that focus on specific nutrient molecules. 

Metagenics holds USP dietary supplement verification, NSF certification, and is also a certified B Corp. The company also follows sustainability practices and establish transparent manufacturing process adhering to the cGMP standards. 

As the brand is closely associated with healthcare practitioners, its D3 and K2 supplements are designed to efficiency support those with higher daily nutrient needs. Two options from this brand provide a higher dosage of 5000 IU and 10,000 IU of D3 with MK-7 K2 in a single serving of 1 softgel. 

Pros

• High-quality formulations designed for people with low levels of vitamin D
• Uses MK-7 K2 form

Cons

• Premium pricing
• No standard low-dose formula

User reviews: Users notice that the softgels from Metagenics are easier to swallow than large capsules. Those who buy other Metagenics supplements point out that they couldn’t find a daily maintenance option from their favorite brand. 

Conclusion 

The best brand of vitamin D3 and K2 supplement for you is the one that aligns with your personal needs, specific lifestyle, digestive health, and purity standards. Pure Encapsulations and ARG, with their hypoallergenic formulations, align more with users with sensitivities, while Thorne supplements may be favored by those who already have a Thorne supplement stack. For individuals following practitioner protocols, Inwell Biosciences or Metagenics may be some of the top choices. Often, for daily supplementation needs, the options from NOW Foods and Vital Nutrients may be helpful. 

To ensure that you get the exact quality and freshness that your health routine needs, you must buy supplements from a trusted store such as Nutriessential. We represent practitioner-grade supplements for health-conscious consumers who understand the importance of purity and testing in a supplement. We source all our supplements directly from manufacturers so that you get the freshest batch with every order. Connect with our experts to learn more.