5 Best Vitamin D3 K2 Supplements of 2026

Mike Published October 5, 2026

Product comparison table
Product	Rating	Price
1. Vitamin D3 K2 - Vitamin D3 10000 iu & K2 as MK-7 120 mcg Complex - 240 Caps NUTRAHARMONY Best Overall		Check Price
2. NOW Supplements, Mega D-3 & MK-7, 5,000 IU/180 mcg, 60 Veg Capsules NOW Foods Best Veg Capsule		Check Price
3. NatureWise Vitamin D3 5000IU + K2 (MK7) 100mcg, 90 Softgels NatureWise Best Softgel		Check Price
4. NUSAVA Vitamin D3 K2, 5000 IU, Softgels, with Omega 3 & Chia Oil, 120 Ct Nusava Best with Omega-3		Check Price
5. NUSAVA Organic Vitamin D3 K2 Drops with MCT Oil, Mocha, Pack of 2 Nusava Best Liquid Formula		Check Price

Detailed Reviews

Best Overall

NUTRAHARMONY

1. Vitamin D3 K2 - Vitamin D3 10000 iu & K2 as MK-7 120 mcg Complex - 240 Caps

Highly Recommended

Pros

Delivers 10,000 IU of D3 and 120 mcg of K2 as MK-7 in one daily capsule
240-capsule count provides an eight-month supply at the stated serving size
Over 3,700 Amazon ratings at 4.7 stars supports the formula's broad user base

Cons

10,000 IU is a higher D3 dose that some users may not need without a deficiency
Capsule only — no liquid or gummy format in this SKU

NUTRAHARMONY positions this formula for adults who want both D3 and the MK-7 form of K2 in one capsule. MK-7 is the longer-acting K2 subtype and the form most referenced in bone and cardiovascular research. With over 3,700 Amazon ratings and a large 240-count bottle, this is the most verified D3 K2 option on this list.

Check Price on Amazon

Best Veg Capsule

NOW Foods

2. NOW Supplements, Mega D-3 & MK-7, 5,000 IU/180 mcg, 60 Veg Capsules

Highly Recommended

Pros

5,000 IU D3 paired with 180 mcg MK-7 K2 in a vegetarian capsule
NOW Foods has over 50 years of supplement manufacturing history
NOW Foods cites bone and cardiovascular support among the formula's stated functions

Cons

60-capsule count is a two-month supply, shorter than some competitors
No added fat source in the capsule — best taken with a meal containing fat

NOW Foods is one of the most widely distributed supplement brands in the US, and this MK-7 formula is a straightforward veg capsule pairing 5,000 IU D3 with 180 mcg K2 as MK-7. NOW states bone and cardiovascular support among the formula's applications. A reliable pick for buyers who specifically need a vegetarian-friendly capsule.

Check Price on Amazon

Best Softgel

NatureWise

3. NatureWise Vitamin D3 5000IU + K2 (MK7) 100mcg, 90 Softgels

Highly Recommended

Pros

5,000 IU D3 and 100 mcg MK-7 K2 in a softgel with organic extra virgin coconut oil
Non-GMO, soy-free, and gluten-free formula
NatureWise cites calcium absorption and bone health among the formula's stated purposes

Cons

90-softgel count is a three-month supply at one softgel per day
K2 dose of 100 mcg is slightly lower than some alternatives on this list

NatureWise's D3 K2 softgel includes organic extra virgin coconut oil in the capsule, a fat source that the brand says supports the absorption of these fat-soluble vitamins. The non-GMO and gluten-free formulation suits buyers with dietary restrictions. A clean, well-labeled softgel from a brand with a large supplement catalog.

Check Price on Amazon

Best with Omega-3

Nusava

4. NUSAVA Vitamin D3 K2, 5000 IU, Softgels, with Omega 3 & Chia Oil, 120 Ct

Highly Recommended

Pros

Combines 5,000 IU D3 and K2 with omega-3 and chia oil in one softgel
120-count bottle is a four-month supply at the stated one-softgel serving
Nusava describes the formula as a multi-nutrient approach to daily supplementation

Cons

Fewer than 20 Amazon ratings at time of writing — limited review evidence
Buyers who already take omega-3 separately may not need the combination

Nusava's D3 K2 softgel stands out for bundling omega-3 and chia oil into the same capsule, reducing the number of pills for buyers who take both nutrients daily. Nusava positions the formula as a clean daily supplement with no unnecessary additives. A practical option if you want to consolidate your fat-soluble vitamins and omega-3 into one softgel.

Check Price on Amazon

Best Liquid Formula

Nusava

5. NUSAVA Organic Vitamin D3 K2 Drops with MCT Oil, Mocha, Pack of 2

Recommended

Pros

Liquid drops with MCT oil — no capsule to swallow
Organic formula in a mocha flavor for daily use
Pack of 2 provides an extended supply for consistent daily use

Cons

4.0 stars across 190 ratings — lower average than the capsule picks above
Measuring drops requires more precision than a standard one-capsule serving

Nusava's organic D3 K2 drops deliver the vitamins in liquid form with MCT oil as the carrier fat, making them a practical choice for people who cannot or prefer not to swallow capsules. The mocha flavor is designed to blend into coffee or morning drinks without measuring tools. Rated 4.0 stars from around 190 Amazon ratings, making this the newest and smallest review base on this list.

Check Price on Amazon

How We Picked

We evaluated vitamin D3 K2 supplements by reviewing brand-stated ingredient labels, K2 form (MK-7 vs. MK-4), D3 dose transparency, verified Amazon buyer rating counts, and independent coverage in nutrition and bone health literature. Our baseline requirement was that each product clearly state both the D3 dose in IU and the K2 dose in mcg, along with the K2 form on the product label.

Fat-soluble vitamin products were also assessed for whether they include a fat source — such as coconut oil or MCT oil — or rely on mealtime fat for absorption. We prioritized MK-7 as the K2 form since it is the more extensively studied subtype for bone and cardiovascular applications. No product was personally consumed or tested by our team. We selected five products representing different formats: capsules at two dose levels, softgels with and without added omega-3, and a liquid drop option.

Buying Guide

D3 Dose: 5,000 IU vs. 10,000 IU

The most common supplemental doses for adults with confirmed low vitamin D are 5,000 IU and 10,000 IU per day, though the right dose depends on your current blood level. NUTRAHARMONY’s formula uses 10,000 IU, a higher dose typically reserved for people correcting a documented deficiency. NOW Foods, NatureWise, and the Nusava softgel all use 5,000 IU, which is more appropriate for maintenance or mild insufficiency. Unless a blood test has shown a significant deficit, most adults do not require a 10,000 IU daily dose long-term.

K2 Form: Why MK-7 Matters

The capsule and softgel picks on this list use K2 as MK-7, the longer-acting subtype associated with sustained carboxylation of matrix Gla-protein — the mechanism by which K2 helps regulate calcium distribution. MK-7 derived from fermentation (such as from natto) stays active in the bloodstream for approximately 72 hours per dose, compared to a few hours for the MK-4 form. NUTRAHARMONY specifically labels its K2 source as MK-7, and NOW Foods markets its formula under the name “Mega D-3 & MK-7.”

Fat-Soluble Absorption

Because D3 and K2 are both fat-soluble vitamins, they absorb most efficiently when taken alongside dietary fat. NatureWise includes organic extra virgin coconut oil directly inside its softgel. Nusava’s liquid drops use MCT oil as the carrier. For capsule formats like NUTRAHARMONY and NOW Foods, the product label typically recommends taking the supplement with a fat-containing meal — a piece of avocado, a handful of nuts, or any meal with olive oil qualifies.

Format: Capsules, Softgels, and Drops

Capsules (NUTRAHARMONY, NOW Foods) are convenient for daily use and come in larger counts. Softgels (NatureWise, Nusava) typically include an oil carrier that aids absorption within the capsule itself. Liquid drops (Nusava Organic D3 K2) suit people who cannot or prefer not to swallow pills — a few drops in coffee or a smoothie delivers the daily dose. Choose the format that fits your existing routine; consistency matters more than format for fat-soluble vitamins.

K2 Dose: 100 mcg to 180 mcg

K2 doses across this list range from 100 mcg (NatureWise) to 180 mcg (NOW Foods) to 120 mcg (NUTRAHARMONY). Research cited in bone health literature often references doses in the 90–180 mcg range. Doses below 90 mcg per day have been used in some studies as well, but most supplement formulas target at least 100 mcg. No “perfect” dose has been established by clinical consensus, so following the label and your healthcare provider’s guidance is appropriate.

Reading the Label: What to Look For

Three things tell you most of what you need to know on a D3 K2 label: the D3 dose in IU, the K2 dose in mcg, and the K2 form — MK-7 or MK-4. A label that says “K2 (as MK-7)” is being transparent about the form. A label that says only “vitamin K2” without specifying MK-4 or MK-7 is less informative. The capsule and softgel products on this list specify their K2 form on the label.

Third, check whether the product includes a fat source (oil) inside the capsule or requires mealtime fat for absorption. Products like NUTRAHARMONY and NOW Foods rely on mealtime fat, while NatureWise, Nusava softgels, and Nusava drops provide the fat carrier within the formula. Neither approach is inherently superior — the key is that you actually take the supplement with fat.

Read about Nusava’s full supplement lineup if you want to explore more of their D3 K2 and liquid drop offerings alongside their other daily health products.

Frequently Asked Questions

What is the difference between MK-4 and MK-7 forms of vitamin K2?

MK-7 is a longer-chain form of vitamin K2 that remains active in the body for a longer period than MK-4 — often cited as having a half-life of several days compared to a few hours for MK-4. The capsule and softgel picks on this list specify K2 as MK-7, which is the form most referenced in research on bone density and cardiovascular calcification. The Nusava drops list vitamin K2 without disclosing the specific form on the product page. MK-4 is more common in dietary sources like cheese and butter, while MK-7 is typically derived from fermented foods such as natto.

How much vitamin D3 do I actually need per day?

The Recommended Dietary Allowance for vitamin D3 is 600 IU for adults up to age 70 and 800 IU for adults over 70, per the National Institutes of Health. Supplements on this list range from 5,000 to 10,000 IU — doses often used when a blood test has confirmed deficiency or insufficiency. Because vitamin D3 is fat-soluble and can accumulate in the body, higher-dose supplementation is best guided by a blood test and a healthcare provider's recommendation.

Why is vitamin K2 paired with D3 in these supplements?

Vitamin D3 supports calcium absorption in the gut, and vitamin K2 helps direct calcium to bones and teeth rather than soft tissues such as arteries. The pairing is a common approach in supplementation, and both NUTRAHARMONY and NOW Foods explicitly cite bone and cardiovascular health among the stated functions of their combined formulas. Note that vitamin K2 can interact with blood-thinning medications such as warfarin — if you take any anticoagulant, check with your doctor before starting a K2 supplement.

Should D3 K2 supplements be taken with food?

Vitamins D3 and K2 are fat-soluble, meaning they absorb more readily when taken with a fat-containing meal. NatureWise includes organic extra virgin coconut oil directly in its softgel to support this. For the capsule formats from NUTRAHARMONY and NOW Foods, taking the supplement with a meal that includes healthy fats is the approach most commonly recommended on product labels. Nusava's drops use MCT oil as the carrier, providing the fat source within the formula itself.

Is it safe to take D3 K2 supplements during pregnancy or while on medication?

If you are pregnant, breastfeeding, taking prescription medications — especially blood thinners — or managing a chronic health condition, consult your doctor before starting any new supplement, including D3 K2. Vitamin K2 may interfere with anticoagulant therapy, and high-dose vitamin D3 supplementation requires individual assessment. Your healthcare provider can recommend an appropriate dose based on your bloodwork and medical history.