Latest update: May 31, 2025 – 4 minute read
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The Best D3 + K2 Supplement Of 2025: A Buyer’s Guide
Vitamin D is everywhere, and here's why most do nothing.
AUTHOR'S NOTE: If you’re trying to find the best D3 + K2 supplement online, you’re in the right place. We tested the top 5 brands. This article reveals why most D3 + K2 formulas suck, and which brand has the #1 product this year.
What Is D3 + K2?
If you feel tired, foggy, or achy more often than you used to, it may not be your fault.
Modern diets can lack the nutrients needed to support strong bones, a healthy heart, and immune balance.
Vitamin D3 and Vitamin K2 are essential nutrients that work together to help your body absorb, use calcium, and regulate mood.*
Supports Bodily Systems
🦴Bone Mineral Density
❤️Arterial and Heart
🧠Mood and Cognition
🛡️Immune System
💪Calcium Absorption
Why Do We Need It?
According to the Cleveland Clinic, Vitamin D deficiency affects more than 40% of U.S. adults.*
Do you have:
Fatigue or low energy
Weakened immunity
Cranky mood
Brittle bones
Rapid aging
Well, here’s the kicker: many people are supplementing with Vitamin D3… but not pairing it with K2. That’s a critical mistake.
Without K2, calcium absorbed by D3 can deposit in your arteries instead of your bones.
This chart is based on findings from peer-reviewed research showing that combining Vitamin D3 with Vitamin K2 can significantly improve calcium utilization.
When taken alone, Vitamin D3 increases calcium absorption but without K2, that calcium ends up in the wrong place.*
With the addition of K2 (especially as MK-7), calcium is safely directed into your bones — where it belongs.
Benefits For Men & Women
Many researchers claim D3 + K2 is one of the most important vitamin combinations for long-term health, strong bones, cognition, and balanced mood.*
It's especially valuable for adults over 30, and those that work or spend the day indoors.
Doses & Side Effects
The recommended dosage depends on age, diet, and current blood levels of Vitamin D3 and K2.
Many experts recommend:
1,500 to 3,000 IU of Vitamin D3 per day
50 to 75 mcg of Vitamin K2 (as MK-7)
Many supplements either use too little, like 1,000iu, or they use too much, like 5,000-10,000.
Brands want to compete by having the "strongest" vitamin - and they don't consider that the dose is likely too much for most people to take daily.
THE DIFFERENT FORMS OF D3 + K2
Vegan D3 (Algae-Based) - Clinically validated and groundbreaking, 100% vegan, and identical to the D3 your body naturally produces from sunlight.
Lanolin-Based D3 ("Sheep Dip") - This cheap D3 is extracted from sheep’s wool using pesticides. This makes up 99% of D3 products for sale. The nasty little secret of the supplement industry.
K2 as MK-7 - The best k2 on the market, MenaQ7® is the most researched form of K2 on the market.
K2 as MK-4 - Doesn't last as long in the body as mk-7 and doesn't absorb as well.
HOT TIP
90%+ of all brands use generic vitamin D3 and K2 from China. The best brands use VegD3® and MenaQ7® which is backed by human studies and trusted by professionals.
TOP 5 SHOPPING MISTAKES
Buying the cheapest - if a product is under $20, it’s likely Chinese generics
Overdosed - brands always sell high doses of D3 (5-10,000iu+) that are not suitable for most people to use daily.*
Sheep Dip Lanolin-derived D3 not suitable for vegans and the sheep wool pesticide extraction is just plain gross.
Additives - avoid supplements with additives and binders that can affect health and irritate digestion.
Best D3 + K2 Supplements of 2025
Vegan Formula
Vegan
Formula
American D3
American
D3
Italian K2
Italian
K2
No Fillers
No
Fillers
Once-Daily Capsule
Once-Daily
Capsule
FDA/GMP Certified
FDA/GMP
Certified
1: Better D3 + K2
by Organics Ocean
Based on 4.8 Average Reviews
A+
RATING
90 Day Money Back Guarantee
PROS
American VegD3®
Italian MenaQ7®
Lanolin-Free
Third-Party Lab Tested
FDA/GMP Certified Non-GMO
90-Day Money-Back Guarantee
CONS
Can sell out due to the patented ingredients
Only available on their website
The Bottom Line
This is the highest quality D3/K2 on the market.
It combines 3,000iu VegD3®, a clinically validated American made D3, with MenaQ7®...the gold-standard K2 made in Italy.
It's perfect for every day use, and uses ingredients backed by more human clinical trials than any other brand.
No fillers. No lanolin. No soy. Third party tested twice for purity.
If you’re serious about your bone, heart, and immune health and want a D3 that’s both high-integrity and USA made.
Tap “LEARN MORE” to check availability and see if their new-customer discount is still active. It comes with a 90-day return policy as well.
Verified Ocean Source
2: D3 + K2
By Sports Research
B
RATING
PROS
Vegan D3
Non-GMO Verified
FDA/GMP Certified
CONS
Generic K2
Additional additives
The Bottom Line
This D3 + K2 offers a plant-based D3 and K2 (MK-7).
While the product uses MK-7 K2, it is a generic...vs MenaQ7® the clinically studied form known for its superior bio-availability used by our #1 ranked brand. Overall, it seems like a contender - they are not using sheep dip and a bunch of fillers.
2: Sea Moss
by Clinical Effects
B-
RATING
PROS
Good for Overall Health
Organic Irish Moss
USA Regulated
90 Day Money Back Guarantee
Subscribe and Save
CONS
40% Less Sea Moss
No Chlorella
Contains Black Pepper
Same Formula as Other Products
The Bottom Line
This product is second on the list since it stands out for being a complete formula with organic ingredients, and USA assurance in terms of the way it is prepared.
It doesn’t require any preparation like raw sea moss, and the strain is Irish. However, after seeing the unnecessary addition of black pepper, we found 4 other supplements that had the same exact formula, which is a small red flag when brands are sharing manufacturers using only different labels. Each of them provides just 500mgs per serving of sea moss, 40% less than our #1 pick.
The cost is $41/bottle after shipping.
2: Sea Moss
by Zoyava
B-
RATING
PROS
Good for Overall Health
Organic Irish Moss
USA Regulated
Subscribe and Save
CONS
50% Less Sea Moss
No Chlorella
Contains Black Pepper
Way Too Many Different Supplements
The Bottom Line
This product is second on the list since it stands out for being a complete formula with organic ingredients, and USA assurance in terms of the way it is prepared.
It doesn’t require any preparation like raw sea moss, and the strain is Irish. However, after seeing the unnecessary addition of black pepper, the insane amount of additional supplements added in, and how little of each supplement the capsules actually contain, I couldn't place it any higher than our #2 spot.
This one provides just 350mg per serving of sea moss, 50% less than our #1 pick.
The cost is $44.99/bottle after shipping.
3: D3 + K2
By Bronson
C
RATING
PROS
K2 as MK-7
Non-GMO
CONS
Generic Vitamins
Contains Several Additives
The Bottom Line
This brand offers MK-7 K2 and D3 combined as well. The K2 and D3 are generic.
Microcrystalline cellulose, magnesium stearate, and silicon dioxide are not necessary in a D3 supplement. These additives are used so their machines flow smoothly...but many customers would rather not ingest them.
4: D3 + K2
By Nature Made
C-
RATING
PROS
K2 as MK-7
Gluten-free
CONS
D3 Is From Sheep Dip
K2 and D3 are Generic
Many Additives
The Bottom Line
This formula delivers D3 and K2, however the D3 is sourced from lanolin (sheep dip), making it unsuitable for vegans...and pretty gross IMO. The K2 is generic as well, and the label includes several additives and an animal-based gelatin capsule.
5: D3 + K2
By Thorne Research
C-
RATING
PROS
D3 and K2
Flexible Dosing
No Additives
CONS
Uses MK-4
Sheep Dip
Taste May be an Issue
High price
The Bottom Line
Thorne’s liquid D3 + K2 offers a flexible dosing format. While it's a trusted brand, this formula uses MK-4 and lanolin-derived D3, which may not suit those seeking plant-based ingredients or the longer-lasting benefits of MK-7. Still, it remains a well-regarded option for those who prefer a liquid supplement. Price starts around $32 per bottle.
2025's Best D3 + K2 Supplement
Better D3 + K2
by Organics Ocean
American VegD3®
Italian MenaQ7®
No Fillers or Sheep Dip
Third Party Lab Tested
90 Day Money Back Guarantee
FDA/GMP Certified
Based on 4.8 Average Reviews
Tap to Get Our Promo Pricing
Our #1 Pick for Sea Moss
Wild Sea Moss
by Organics Ocean
References
DISCLAIMER: This scientific research is for informational purposes only. The results reported may not necessarily occur in all individuals. Rain Media provides this information as a service but does not endorse it. This information should not be read to recommend or endorse any specific products.
Knapen, M. H. J., et al. (2013). Three-year low-dose menaquinone-7 supplementation helps decrease bone loss in healthy postmenopausal women. Osteoporosis International, 24(9), 2499–2507. https://doi.org/10.1007/s00198-013-2325-6
Theuwissen, E., et al. (2014). Vitamin K status in healthy volunteers. Food & Function, 5(2), 229–234. https://doi.org/10.1039/c3fo60464k
Holick, M. F. (2007). Vitamin D deficiency. New England Journal of Medicine, 357(3), 266–281. https://doi.org/10.1056/NEJMra070553
Institute of Medicine. (2011). Dietary Reference Intakes for Calcium and Vitamin D. National Academies Press. https://doi.org/10.17226/13050
Beulens, J. W. J., et al. (2013). The role of menaquinones (vitamin K2) in human health. British Journal of Nutrition, 110(8), 1357–1368. https://doi.org/10.1017/S0007114513001013
Iwamoto, J., Takeda, T., & Ichimura, S. (2000). Effect of combined administration of vitamin D3 and vitamin K2 on bone mineral density of the lumbar spine in postmenopausal women with osteoporosis. Journal of Orthopaedic Science, 5(6), 546–551. https://doi.org/10.1007/s007760070003
AIDP, Inc. (2021). New Study Confirms VegD3® is a Bioavailable Source of Vitamin D. https://aidp.com/2021/03/03/new-study-confirms-vegd3-is-a-bioavailable-source-of-vitamin-d-making-it-an-ideal-alternative-for-vegans-and-vegetarians/Knapen, M. H. J., et al. (2015). Menaquinone-7 supplementation improves arterial stiffness in healthy postmenopausal women: a double-blind randomized clinical trial. Thrombosis and Haemostasis, 113(5), 1135–1144. https://doi.org/10.1160/TH14-08-0675
BEST
9.8/10
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