Best Vitamin D3 + K2 Supplements (2026 Buyer's Guide)

We compared seven vitamin D3 + K2 products sold in the US on dose against the trials, K2 form, carrier, testing, fillers, and real cost per day, with every price checked on the brand's own site on October 13, 2026. For most people the answer is 5,000 IU of D3 with 100 to 180 mcg of MK-7 in oil for under $0.40 a day. We make one of the three products that hit that mark, and NOW's capsule beats ours on K2 dose.

Mt. Angel Vitamins makes two of the products in this guide, and we ranked them with the same six criteria we applied to everyone else: dose against the published trials, K2 form, carrier, testing you can check, fillers, and price per day. Where a competitor is the better choice for a situation, that competitor gets the category, and it happens four times below. Every competitor fact on this page was pulled from the brand's own product page on October 13, 2026. Our own facts come from our label and our lot-level certificates of analysis.

If you only read one thing For most people: 5,000 IU of D3 with 100 to 180 mcg of MK-7 in an oil base, from a company that shows its testing, for under $0.40 a day. Three products here do that. Ours is the liquid, NOW's is the capsule with the most K2, and Sports Research's is the vegan softgel. If you have never had a vitamin D blood test, start lower than 5,000 IU or get the test first. Scroll for the picks by situation and the side-by-side table.

Key takeaways

• A 5,000 IU D3 plus 100 to 180 mcg of MK-7 in an oil carrier for under $0.40 a day is the sweet spot for most adults; three products in this guide land there, at $0.37, $0.38, and $0.40 a day (prices checked October 13, 2026).
• The only three-year randomized trial of MK-7 in healthy adults gave 244 postmenopausal women 180 mcg a day; NOW Mega D3 & MK-7 is the one product here that matches that dose.
• MK-7 builds up in the blood 7 to 8 fold with daily use, while a 420 mcg dose of MK-4 was undetectable in serum in a head-to-head study, so MK-7 products rank ahead of MK-4 products at the same price.
• 5,000 IU is above the NIH upper limit of 4,000 IU a day, and a three-year trial of 4,000 and 10,000 IU in 311 healthy adults found slightly lower bone density than 400 IU; treat 5,000 IU as a dose for people who tested low, not a default.
• Taking vitamin D3 with a fat-containing meal raised peak blood levels by 32% in a trial of 50 older adults, which is why an oil-based drop or softgel ranks above a dry capsule taken on an empty stomach.
• In a 2013 potency check of 55 over-the-counter vitamin D bottles from 12 makers, measured content ran from 9% to 146% of the label, so a certificate of analysis for your lot is the only proof that counts.
• If you take warfarin or a similar blood thinner, skip this category entirely: 10 mcg a day of MK-7, less than a quarter of the smallest dose here, changed anticoagulation in a dose study of healthy volunteers.

How we judged them

Six criteria, applied in the same order to every bottle, ours included. Each one has a number attached, because "high quality" is not a criterion. The background on the vitamin itself lives in our complete vitamin D guide; this page is only about which bottle.

Dose against the trials

The K2 number that matters is 180 mcg of MK-7 a day. That is what the three-year Maastricht trial (Knapen et al., 2013, Osteoporosis International) gave 244 healthy postmenopausal women, and at that dose vitamin K status improved and the age-related decline in bone mineral density slowed at the spine and femoral neck, though not at the total hip. The same cohort, at the same 180 mcg, showed lower arterial stiffness after three years (Knapen et al., 2015, Thrombosis and Haemostasis). Evidence grade for MK-7 and bone density: Moderate, one well-run trial in one population. Evidence grade for D plus K together on bone density: Moderate, from an eight-trial meta-analysis of 971 people (Kuang et al., 2020, Food & Function) that found a small, significant gain in total bone mineral density from the combination.

Products in this guide run from 45 to 180 mcg of MK-7. We did not penalize 100 or 120 mcg, because the NIH adequate intake for vitamin K is 120 mcg for men and 90 mcg for women, and we noted who hits 180.

For D3, the trial picture is uncomfortable for anyone selling it. A 2018 meta-analysis of 81 trials and 53,537 adults (Bolland et al., Lancet Diabetes & Endocrinology) found no effect of vitamin D supplements on fractures, falls, or bone density at any dose. What D3 reliably does is raise blood 25(OH)D, by about 0.7 nmol/L per microgram of daily intake, roughly 7 nmol/L (3 ng/mL) per 400 IU, in a 20-week dosing study of 67 men (Heaney et al., 2003, American Journal of Clinical Nutrition). Evidence grade for raising 25(OH)D: Strong. Evidence grade for any downstream outcome in people who are not deficient: Insufficient. Every product here uses D3 rather than D2 because a meta-analysis of head-to-head trials (Tripkovic et al., 2012, American Journal of Clinical Nutrition) found D3 raises 25(OH)D more reliably; our D3 versus D2 comparison covers why, and the dosage guide covers how to pick a number.

K2 form: MK-7 over MK-4

MK-7 and MK-4 are both vitamin K2, and they behave nothing alike in the body. In a head-to-head study in healthy Japanese women (Sato et al., 2012, Nutrition Journal), a single 420 mcg dose of MK-7 stayed measurable in serum for 48 hours, while the same dose of MK-4 never appeared in serum at all. Seven days of 60 mcg MK-7 raised serum levels in every subject. Seven days of 60 mcg MK-4 raised nothing. An earlier comparison of K1 and MK-7 (Schurgers et al., 2007, Blood) found MK-7 accumulates 7 to 8 fold during prolonged daily intake because of its long half-life, and carboxylates osteocalcin more completely. The MK-4 doses with human trial data are pharmacological: the NIH fact sheet notes that 45 mg a day, which is 45,000 mcg, is used in Japan. That is 45 times the largest MK-4 dose we looked at. So a product listing MK-4 at 200 or 1,000 mcg is, by the available evidence, a D3 product with a K2 line on the label. Two products here use MK-4; both lost ground on this criterion and nothing else. One fact that puts the whole category in perspective: a 3-ounce serving of natto carries about 850 mcg of MK-7, more than four times the strongest capsule we ranked.

Carrier: oil beats dry powder

Vitamins D3 and K2 are fat soluble. In a single-dose absorption study in 50 older adults (Dawson-Hughes et al., 2015, Journal of the Academy of Nutrition and Dietetics), the peak plasma D3 level was 32% higher when the supplement came with a fat-containing meal than with a fat-free one. A 12-week trial of three delivery forms (Traub et al., 2014, Journal of Clinical Endocrinology and Metabolism) found oil-emulsified drops produced a larger rise in 25(OH)D per microgram than chewable tablets, though two of the three products in that trial did not match their own labels. Evidence grade: Moderate. An oil-based drop or softgel carries its own fat. A dry capsule needs breakfast. We scored products on the carrier they ship in, not the meal you might remember to eat. The longer comparison of drops, softgels, capsules, and gummies is in our supplement forms article.

Testing you can check

A label is a claim. A certificate of analysis (a lab report for one manufacturing lot, listing identity, potency, and contaminant results) is evidence. When Kaiser Permanente researchers tested 55 over-the-counter vitamin D bottles from 12 manufacturers (LeBlanc et al., 2013, JAMA Internal Medicine), measured potency ran from 9% to 146% of the label claim and varied between pills inside the same bottle. We gave full marks for a published certificate of analysis by lot, partial marks for a third-party mark on the product page (NSF, USP, Intertek, Non-GMO Project), and nothing for the phrase "third-party tested" with no mark and no document. Our guide to reading supplement test results explains what each of those covers.

Price per effective day

Bottle price is noise. We divided the brand-site price on October 13, 2026 by servings per container, at the serving that delivers the labeled dose. The range in this guide is $0.06 to $0.93 a day, and the cheapest product delivers the least K2 that counts, so price per day is read next to the dose, never alone.

Fillers and serving honesty

Fewer inactive ingredients is better, and two is excellent for a liquid. A dry capsule needs a flow agent and a bulking agent, so we did not penalize cellulose or silicon dioxide; we did note maltodextrin and modified starch, because they are there for the encapsulating machine, not for you. Serving honesty means the labeled dose arrives in the serving the label states, with no per-capsule number hiding a two-capsule serving. Every product here passed. One requires two capsules per serving and says so on the front.

The picks

Six picks by situation, two of them ours and four of them not. The category the evidence cares about most goes to a competitor, which is the only way a ranking earns the right to include the house brand at all.

Best overall value for most people: Mt. Angel Vitamins Everyday Liquid Sunshine 2

Dose: 5,000 IU (125 mcg) vitamin D3 and 120 mcg vitamin K2 as all-trans MK-7 per serving. Form: oil-based liquid, one dropper squeeze, in fractionated coconut oil and sunflower oil with natural orange flavor. Servings: approximately 70 per 2-ounce bottle. Price: $25.99 on mtangelvitamins.com on October 13, 2026, which is $0.37 a day. Testing: made in our own cGMP facility in Mt. Angel, Oregon; every batch tested in our in-house lab for identity, potency, and purity; certificate of analysis published by lot.

It wins on carrier and on the ingredient list. The D3 and MK-7 arrive already dissolved in fat, so the absorption step the trials care about is built in, and the entire inactive list is two oils and a flavor. At $0.37 a day it ties the cheapest full-dose product in the guide, and the lot-level lab report is a click away rather than a request away.

Where it falls short: 120 mcg of MK-7 is a solid daily amount but not the 180 mcg trial dose, and 5,000 IU is more D3 than someone with a normal blood level needs. Everyday Liquid Sunshine 2 product page.

Best match to the K2 trial dose: NOW Mega D3 & MK-7

Dose: 5,000 IU (125 mcg) vitamin D3 and 180 mcg vitamin K2 as MK-7 (MenaQ7) per capsule. Form: dry veg capsule (hypromellose) with microcrystalline cellulose, modified starch, maltodextrin, and silicon dioxide. Servings: 30, 60, or 120 capsules, one a day. Price: $14.99, $26.99, or $45.99 on nowfoods.com on October 13, 2026, which is $0.38 a day in the 120-count. Testing: Intertek GMP certification mark on the product page, plus kosher and halal marks.

This is the only product in the guide that delivers 180 mcg of MK-7, the exact daily amount and the exact branded ingredient used in the three-year Maastricht trial described in the criteria above. On the criterion the evidence weighs most, it wins outright, and it does it at $0.38 a day in the large bottle.

Where it falls short: it is a dry capsule with five inactive ingredients, so the fat has to come from your plate, and NOW's own directions say to take it with a fat-containing meal. The 30-count works out to $0.50 a day, so buy the 120.

Best vegan D3 + K2: Sports Research Vitamin D3 + K2

Dose: 5,000 IU (125 mcg) vitamin D3 from lichen and 100 mcg vitamin K2 as MK-7 from chickpea per softgel. Form: plant-based softgel (tapioca-based Plantgel) with coconut MCT oil, colored with turmeric. Servings: 30, 60, or 120 softgels, one a day. Price: $16.95, $23.95, or $43.95 on sportsresearch.com on October 13, 2026, which is $0.40 a day in the 60-count and $0.37 in the 120. Testing: Non-GMO Project Verified, Vegan Certified, and gluten-free marks on the product page; the brand states third-party testing and cGMP compliance.

Most D3 is made from lanolin, the grease in sheep's wool. This one is not, and it still ships in an oil carrier, which is the combination vegans usually cannot find at this price. Sports Research says its Plantgel softgel is one of the few plant softgels to pass Non-GMO Project verification.

Where it falls short: 100 mcg is the lowest MK-7 dose among the full-strength products here, and Sports Research works with contract manufacturers rather than making its own, so the lot-level lab report is not on the page.

Best for adjustable or low-dose use: Thorne Vitamin D + K2 Liquid

Dose: 1,000 IU (25 mcg) vitamin D3 and 200 mcg vitamin K2 as MK-4 (menatetrenone) per two drops. Form: oil-based liquid in medium-chain triglyceride oil with mixed tocopherols. Servings: 600 two-drop servings per bottle on the label (the page text says 1,200; we used the label). Price: $34 on thorne.com on October 13, 2026, or $0.06 a day. Testing: Thorne states it tests each ingredient for identity, purity, and potency; no third-party mark is shown for this item.

If you want to dose by the drop, this is the bottle. Two drops is 1,000 IU, six drops is 3,000 IU, and the cost stays under a dime a day at either. The directions allow two drops one to three times a day, which makes it the most flexible product in the guide and the cheapest by a wide margin.

Where it falls short: the K2 is MK-4 at 200 mcg. On the absorption data in the criteria section, that amount of MK-4 does not register in serum, so treat this as a very good D3 drop with a nominal K2, and add a separate MK-7 if K2 is the point.

Best gummy: Nordic Naturals Vitamin D3+K2 Gummies

Dose: 1,000 IU (25 mcg) vitamin D3 and 45 mcg vitamin K2 as MK-7 per gummy. Form: pectin gummy, pomegranate flavor, 10 calories and 2 g added sugar per gummy. Servings: 60, one a day. Price: $24.95 on nordic.com on October 13, 2026, which is $0.42 a day. Testing: non-GMO and third-party purity marks on the page; the brand says a certificate of analysis is available for any product through its quality page.

A gummy a person will take beats a capsule they will not. This one uses the right form of K2, keeps the sugar at 2 g, and puts its lab results behind a request rather than nowhere. For maintenance, 1,000 IU plus 45 mcg is a defensible daily pairing.

Where it falls short: it is the most expensive 1,000 IU in the guide at $0.42 a day, and 45 mcg of MK-7 is a quarter of the trial dose.

Best if you also want calcium and bone minerals: Mt. Angel Vitamins Bones + K2

Dose: 1,000 IU (25 mcg) vitamin D3, 120 mcg vitamin K2 as MK-7, 500 mg calcium and 40 mg magnesium from Aquamin red marine algae, 2 mg manganese, and 3 mg boron per two capsules. Form: vegetarian capsule, two per serving, with organic rice extract, organic rice concentrate, and cellulose. Servings: 30 per 60-count bottle. Price: $27.99 on mtangelvitamins.com on October 13, 2026, which is $0.93 a day. Testing: the same proof stack as our liquid: our own cGMP facility, in-house identity, potency, and purity testing on every batch, and a lot-level certificate of analysis.

This is the pick when the question is "do I also need a calcium" and the answer is yes. It is the only product here that puts D3 and MK-7 in the same serving as the mineral they help the body place, from a plant source, with the trace minerals bone uses alongside it.

Where it falls short: it costs more than twice as much per day as anything else in the guide, it is two capsules, and 1,000 IU of D3 is a maintenance amount. If you need 5,000 IU, pair it with a D3 drop rather than doubling it. Bones + K2 product page.

Also compared, not ranked

Designs for Health Vitamin D Supreme (5,000 IU D3, 1,000 mcg vitamin K1, 1,000 mcg K2 as MK-4, and 5 mg geranylgeraniol per capsule; $38.49 for 60 on designsforhealth.com on October 13, 2026, or $0.64 a day) was verified and considered. It did not take a category because its K2 is MK-4, which lost on the form criterion, and because the brand labels it for use under practitioner guidance. Garden of Life's mykind Organics Vegan D3 Chewable was on our list and dropped: it contains no K2, so it is outside the category.

Side-by-side

Red flags

A K2 number with no form named

"Vitamin K2 100 mcg" with no MK-7 or MK-4 after it is a label that does not want you to ask. The two forms behave so differently in blood that the number means nothing without the letters. Walk away, or email the brand and time how long the answer takes.

MK-4 priced like MK-7

MK-4 is cheaper to make. A product that lists 500 or 1,000 mcg of MK-4 is quoting a big number from the form with the weakest absorption data at supplement doses. If the bottle costs the same as a 180 mcg MK-7 product, the arithmetic is not in your favor.

A proprietary blend anywhere near a vitamin

Vitamins D and K have no reason to hide inside a blend. If the label says "bone support complex 400 mg" and lists D3 and K2 inside it without their own amounts, the dose is whatever the brand wants it to be that quarter.

"Clinically proven" with no citation

The trials behind this category are specific: 180 mcg of MK-7 for three years in postmenopausal women, and 5,000 IU of D3 in people who tested low. A page that says "clinically proven" and links to nothing is borrowing those trials without earning them. Ask for the PubMed ID.

A price that only works per bottle

$14.99 for 30 capsules sounds cheaper than $45.99 for 120 until you divide. The same product, in this guide, is $0.50 a day in the small bottle and $0.38 in the large. A brand that pushes the small size is counting on you skipping that division.

An Amazon listing with no manufacturer named

If the listing does not say who made it and where, there is no lot to trace and no lab report to request. Every brand in this guide names a company and a city on the label. That is the floor, not the ceiling.

Who should skip this entirely

If you take warfarin or another vitamin K antagonist, do not take any vitamin K2 supplement, in any dose, from any brand, unless the clinician who manages your clotting test told you to. These medicines work by blocking vitamin K, and in a dose study of 18 healthy volunteers (Theuwissen et al., 2013, Journal of Thrombosis and Haemostasis), as little as 10 mcg of MK-7 a day shifted the clotting measurement in some people, and 45 mcg shifted it across the group by about 40%. The NIH fact sheet says sudden changes in vitamin K intake can raise or lower the anticoagulant effect. Newer blood thinners that do not act through vitamin K are a different conversation. Have it with your prescriber anyway.

Skip the 5,000 IU products if you have never had a 25(OH)D test and have no reason to think you are low. The NIH upper limit for adults is 4,000 IU a day, and in a three-year trial of 311 healthy adults (Burt et al., 2019, JAMA), 4,000 and 10,000 IU a day produced slightly lower bone density at the radius than 400 IU, with no gain in strength. Get the test first, especially with a kidney or parathyroid condition or a history of kidney stones. Our testing article covers the numbers; the safety page covers too much.

Next reads

• What vitamin D3 does, how it is absorbed, and what the research supports: the monograph behind every D3 claim on this page.
• Why D3 and K2 are paired, and whether the pairing is proven: the mechanism and the trials, without the product talk.
• Best vitamin D supplements overall, including D3-only picks: if you decided you do not need the K2 after all.

Related reading

• What the K2 research actually supports before you compare products

More on The Complete Guide to Vitamin D