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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Choosing a D3 and K2 supplement depends on one thing: getting the dose right so that calcium ends up in your bones, not stuck in your arteries. The difference between a smart buy and wasted money is in the published research behind the K2 ingredient and the pairing of vitamin D3 levels for real absorption. This guide walks you through the seven best options on the shelf, comparing the exact IU (International Units, the standard measure for D3) and mcg (micrograms, one-millionth of a gram) amounts that matter for bone strength, heart health, and immune support.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
This breakdown of the best d3 k2 supplement helps you match the right potency and serving size to your personal health needs, whether you are new to supplements or switching from a different formula.
Quick Picks
- Now Supplements Vitamin D3 K2, 1,000 IU/45 mcg — Best Value
- ForestLeaf Vitamin D3 + K2 (MK7) Supplement — Best Travel Pick
- Bluebonnet Nutrition Vitamin D3 & K2, Soy-Free — Clean Label Champ
- NatureWise Vegan Vitamin D3 + K2, 5,000 IU — Best Vegan Formula
- Vitamin K2 D3 Supplement 5000 IU D3 and 180 mcg K2 MK7 — Clinically Researched
- BioEmblem Vitamin D3 K2 Capsules (5000IU and 200mcg) — Dual K2 Complex
- NatureBell Vitamin Double Strength D3 + K2, 10,000 IU — Highest Potency
How To Choose The Best D3 K2 Supplement
The most important factor is your desired D3 dosage, because it determines the serving size and how many days a single bottle will last. Look for a clear IU label for vitamin D3, and a mcg label for K2 so you can compare apples to apples.
Understand the K2 Form: MK7 vs MK4
MK7 (menaquinone-7) stays active in your bloodstream longer, so a once-daily dose works well. MK4 (menaquinone-4) absorbs quickly but needs to be taken more often. Some blends, like the BioEmblem formula, include both forms to cover short-term and sustained activity. Look for “MenaQ7” — the branded ingredient that has published human clinical research backing its effectiveness, according to the manufacturer.
Quick Comparison
| Model | Best For | Vitamin D3 per Serving | Vitamin K2 per Serving | Servings per Container | Amazon |
|---|---|---|---|---|---|
| Now Supplements | Mid-Range Maintenance | 1,000 IU | 45 mcg | 180 | Amazon |
| ForestLeaf | Small Capsule Preference | 5,000 IU | — | 60 | Amazon |
| Bluebonnet Nutrition | Allergen-Free Formula | — | — | 60 | Amazon |
| NatureWise Vegan | Vegan & Plant-Based | 5,000 IU | 100 mcg | — | Amazon |
| Truevantage Nutrition | Clinically Researched MK7 | 5,000 IU | 180 mcg | 60 | Amazon |
| BioEmblem | Dual K2 Forms (MK4+MK7) | 5,000 IU | 200 mcg | 90 | Amazon |
| NatureBell | Highest Potency D3 | 10,000 IU | 200 mcg | 240 | Amazon |
In‑Depth Reviews
1. Now Supplements Vitamin D3 K2, 1,000 IU/45 mcg
The budget-friendly workhorse gives you the longest supply of capsules on this list.
You grab this if you want a low daily dose (1,000 IU of D3 and 45 mcg of K2) and do not want to reorder for six months. The 180 vegetarian capsules mean 180 servings versus 60 servings for the ForestLeaf option, giving you a longer runway before you restock. Buyers report this dosage raised their vitamin D level to mid-range., and reviewers noted they took it for over 180 days straight without any negative side effects.
Compared to the Truevantage Nutrition pick which delivers 180 mcg of K2, this Now formula delivers 45 mcg. That makes it better suited for general maintenance rather than targeted bone-support therapy. It is also a family-owned company since 1968 and carries an NPA A-rated GMP certification, so the quality checks are documented.
Why it stands out
- 180 servings per bottle — lasts much longer than the ForestLeaf 60-count
- Non-GMO, Kosher, and Soy Free certifications
- Small capsule size that buyers find easy to swallow
One limitation
- At 1,000 IU of D3, it is lower than the 10,000 IU in the NatureBell pick and the 5,000 IU in the NatureWise pick
Reach for this if: you want a low-maintenance, affordable daily supplement that keeps your levels steady without the high potency of a 5,000 IU formula.
A better fit for someone else: anyone trying to correct a significant D3 deficiency will want a higher IU count like the 10,000 IU in the NatureBell.
2. ForestLeaf Vitamin D3 + K2 (MK7) Supplement
Uniquely small capsules make daily swallowing easy.
Reviewers specifically note they chose Forest Leaf K2+D3 over a pricier competitor because of the capsule size. — it is described as uniquely small, making it easier to take than other options. The 5,000 IU of D3 matches the Truevantage and NatureWise picks, but the ForestLeaf bottle only holds 60 veggie capsules, versus 180 capsules in the Now Supplements bottle.
One buyer pointed out there is no oil in the ingredients list, so you need to take it with a meal containing fat for proper absorption. The formula is third-party laboratory tested for potency and absorption, and it is made in a GMP compliant facility. If you travel often and want a small bottle you can toss in a bag, this format fits.
Key highlights
- Very small, easy-to-swallow capsule size praised in reviews
- 5,000 IU D3 supports immune system function
- Made from natural vegetable sources, free of gluten, dairy, and nuts
Trade-off
- 60 servings mean you reorder more often compared to the 180-count Now bottle
Who it fits: anyone who struggles with large pills and wants a 5,000 IU D3 dose without the bulk of a 180-count bottle.
skip it if: you want the convenience of a six-month supply — the 60-count runs out fast.
3. Bluebonnet Nutrition Vitamin D3 & K2, Soy-Free
A clean, allergen-free formula from a brand buyers trust for transparency.
Bluebonnet skips the major allergens — milk, egg, fish, shellfish, tree nuts, peanuts, wheat, and soy — and it is also free of gluten, barley, and sodium. Reviewers report the 5000IU small capsules have no taste or smell, making them easy to take daily. One buyer switched from a more expensive brand and noticed zero difference in effectiveness, calling it a great value..
The package is relatively large at 4.8 ounces, versus 1.12 ounces for the NatureWise bottle, so you get a more substantial container. The 60 servings match the ForestLeaf count, but the clean-label promise stands out if you manage multiple food sensitivities or prefer a brand with a long reputation for transparency.
Clean credentials
- Free of the top nine allergens including soy, dairy, and gluten
- Kosher Certified and Non-GMO
- Buyers confirm it is easy to swallow with no aftertaste
Limitation
- 60 servings per container is a shorter supply compared to the 180-count Now bottle
Perfect for: people with food allergies or sensitivities who need a verified clean capsule with no hidden ingredients.
Not ideal if: you want a high serving count — consider the Now bottle for a longer-lasting supply.
4. NatureWise Vegan Vitamin D3 + K2, 5,000 IU
Plant-based D3 from lichen paired with clinically studied VitaMK7 K2.
Most vitamin D3 comes from lanolin (sheep wool), but NatureWise uses VegaDelight, a natural D3 sourced from sustainably harvested lichen — an algae that produces a vegan and bioavailable form. The K2 comes from VitaMK7, a natural source that is clinically studied for supporting bone formation. Each capsule delivers 5,000 IU of D3 and 100 mcg of K2, with organic cold-pressed olive oil as the carrier to boost absorption without heat or hexanes.
Owners mention this supplement is effective for bone support., with small softgels that leave no aftertaste. A key edge over the Bluebonnet formula is that this bottle is NSF-certified, meaning the contents are tested for accuracy and purity. At 1.12 ounces, the package is the lightest on this list, making it easy to store.
Vegan advantage
- Vegan D3 from lichen, not lanolin
- NSF certification confirms third-party testing for accuracy and purity
- Organic cold-pressed olive oil enhances absorption
Downside
- 100 mcg K2 is lower than the 200 mcg found in the BioEmblem and NatureBell picks
Choose this for: a verified vegan D3 + K2 formula with an NSF seal and clinically studied ingredients.
Look elsewhere if: your priority is the highest K2 dose per capsule — the Truevantage and BioEmblem both offer more.
5. Vitamin K2 D3 Supplement 5000 IU D3 and 180 mcg K2 MK7
Premium MenaQ7 at 180 mcg — the same MK7 dose used in a landmark three-year study.
This is the supplement for someone who wants the exact MK7 dose that has published human clinical research behind it. The manufacturer specifically says that the groundbreaking three-year study used 180 mcg of MenaQ7, and that is exactly what you get in each capsule. Buyers share powerful results — One buyer wrote that taking K2-D3 twice weekly with yogurt as a calcium source improved knee healing after a two-year injury, enabling walking and gardening again..
The D3 per serving is 5,000 IU, matching the NatureWise and ForestLeaf picks, while the K2 dose is 180 mcg versus 45 mcg in the Now Supplements formula. The 60-count supply is the same as the ForestLeaf bottle, so you will reorder at a similar pace.
Clinical backing
- 180 mcg MenaQ7 — the same MK7 dose from published human clinical research
- Customers note real improvements in mobility and healing
- Made in a GMP, FDA registered facility with Non-GMO ingredients
Consideration
- Only 60 servings per bottle; the Now formula has 180 servings versus 60 servings
Go with this if: you want the exact clinically researched dose of MK7 for targeted bone and heart support, backed by published studies.
Pass if: you need a long supply — the 60-count will have you reordering more often than the 180-count Now bottle.
6. BioEmblem Vitamin D3 K2 Capsules (5000IU and 200mcg)
Two forms of K2 in one capsule — fast-acting MK4 and long-lasting MK7.
Most D3+K2 supplements only use the MK7 form, but BioEmblem adds 100 mcg of MK-4 alongside 100 mcg of MK-7 for a total of 200 mcg of K2 per capsule. MK-4 absorbs quickly for immediate activity, while the MK-7 (branded MenaQ7 derived from chickpeas) stays active in your body much longer. The D3 comes in at 5,000 IU, matching the NatureWise and Truevantage picks.
Buyers appreciate the clean ingredients — each batch is tested four times during production, and the capsules contain only veggie capsules and rice hull extract. One reviewer noted it was the first time in decades their D3 level was not deficient.. The 90-capsule count sits between the 180-count Now bottle and the 60-count ForestLeaf bottle, giving a middle-ground supply.
Unique formulation
- Includes both MK-4 and MK-7 forms of vitamin K2 for dual-action support
- 90 servings per bottle — more than the 60-count bottles from ForestLeaf and Bluebonnet
- Patented MenaQ7 from chickpeas, vegetarian and non-GMO
Trade-off
- Higher upfront cost per bottle compared to the Now or ForestLeaf options
Ideal for: those who want the broadest K2 coverage with both fast-acting and sustained-release forms in a single daily capsule.
Not for: a strict budget — the Now formula delivers more servings for less money if you are only looking for standard MK7.
7. NatureBell Vitamin Double Strength D3 + K2, 10,000 IU
The highest D3 dose on this list, with 240 softgels for an eight-month supply.
At 10,000 IU of vitamin D3, this is the highest-potency formula on the list, versus 5,000 IU in the NatureWise, ForestLeaf, and Truevantage picks. The K2 comes in at 200 mcg, matching the BioEmblem total but delivered as a single MK7 form instead of the MK4+MK7 blend. Each softgel is infused with coconut oil to improve the absorption of both fat-soluble vitamins.
Buyers with very low blood D levels (under 12 ng/mL) report taking this daily with fatty food and noticing improved energy consistency with no side effects.. The 240-count bottle leads every other option for supply — it offers 240 servings versus 60 servings in the ForestLeaf or Truevantage bottles. The capsules are described as small and easy to swallow, with no odor or taste.
Maximum potency
- 10,000 IU D3 — the highest daily dose on this list
- 240 softgels per bottle, offering the longest supply of any pick
- Third-party tested; non-GMO, gluten-free, dairy-free, soy-free, and egg-free
Important note
- 10,000 IU may be too high for some individuals — consult a healthcare provider before starting
Best for: those with confirmed low D3 levels needing a high-potency, long-supply softgel with an absorption-boosting oil base.
Skip if: you need a lower daily dose — the 5,000 IU options from NatureWise or ForestLeaf may be a better starting point.
Understanding the Specs
Vitamin D3 (IU)
This number, listed as International Units (IU), tells you how much vitamin D you get per serving. Higher numbers like 10,000 IU are for correcting a known deficiency quickly, while 1,000 IU is typically a maintenance dose. The NatureBell leads at 10,000 IU, while the Now Supplements formula is the lowest at 1,000 IU.
Vitamin K2 (mcg)
Measured in micrograms (mcg), this is the amount of menaquinone per serving. The Truevantage Nutrition pick uses 180 mcg of MenaQ7 — the exact dose from a three-year published study according to the manufacturer — while the Now formula uses 45 mcg. A higher mcg count generally supports stronger calcium-direction activity toward bones and away from arteries.
Serving Size and Supply
This is the number of individual capsules or softgels in the bottle. The Now Supplements bottle has 180 servings, versus 60 servings for the ForestLeaf or Truevantage options. A bigger count means fewer reorders and a lower cost per day, but you pay more upfront.
Third-Party Certifications
Look for logos like NSF, Non-GMO, Kosher, or GMP — these mean an outside organization checked the contents for accuracy and purity. The NatureWise bottle is NSF-certified, and the BioEmblem bottle is tested 4 times during production. A certification adds confidence that the listed IU and mcg match what is actually in the capsule.
FAQ
What is the difference between MK7 and MK4 in a D3 K2 supplement?
How many IU of vitamin D3 should I take daily?
Can I take a D3 K2 supplement if I am vegan?
Why do D3 and K2 need to be taken together?
How long does a 60-serving bottle of D3 K2 last?
What does MenaQ7 mean on a label?
Are D3 K2 supplements safe to take with blood thinners?
Which product has the highest vitamin K2 per serving?
Final Thoughts: The Verdict
If you want one dependable pick, the best d3 k2 supplement winner is the BioEmblem Vitamin D3 K2 because it combines 5,000 IU of D3 with a dual-form K2 complex (200 mcg total) for broad coverage in a 90-count bottle. If you want the longest supply with a proven brand name, grab the Now Supplements Vitamin D3 K2. And for a vegan-friendly, NSF-certified option with organic olive oil absorption, the NatureWise Vegan D3 + K2 leads the plant-based category.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.