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Vitamin K2 + Vitamin D3, 120 Capsules vs Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK

Side-by-side comparison of scores, ingredients, prices and real customer feedback for Vitamin K2 + Vitamin D3, 120 Capsules and Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK.

Last verified: 07 Apr 2026 · Based on 66 reviews

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81.0
Quick Answer

Vitamin K2 + Vitamin D3, 120 Capsules scores 81.0/100 vs Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK at 80.0/100. Vitamin K2 + Vitamin D3, 120 Capsules wins on effectiveness, ingredient quality, value for money. Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK is stronger on side effects and certifications.

How Do the Scores Compare?

Vitamin K2 + Vitamin D3, 12...
Nutravita Vitamin D3 4000 i...
Vitamin K2 + Vitamin D3, 120 Capsules
Vitamin K2 + Vitamin D3, 12...
Nutricost
 Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK
Nutravita Vitamin D3 4000 i...
Nutravita
Overall Score 81.0 80.0
Effectiveness 82.0/100
Best
 80.0/100
Ingredient Quality 84.0/100
Best
 77.0/100
Value for Money 91.0/100
Best
 90.0/100
Side Effects 87.0/100 88.0/100
Best
Certifications 42.0/100 62.0/100
Best
Best Price £12.96 iHerb → £8.99 Amazon UK →
Cheapest
Form None Softgel
Dose None 116 Grams
Third-Party Tested ✗ No ✗ No
Reviews Analysed 49 17

Vitamin K2 + Vitamin D3, 120 Capsules

Pros

  • ✓K2 is supplied as MK-7 (menaquinone-7) — the longer-acting form with significantly better bioavailability than the cheaper MK-4 used in many budget products
  • ✓5000 IU D3 is a genuinely effective dose for correcting deficiency, not the token 400–1000 IU found in most multivitamins
  • ✓Softgel format in sunflower oil delivers fat-soluble vitamins in their ideal absorption medium
  • ✓120 softgels at four months' supply represents strong value — reviewers repeatedly flag the price-to-quantity ratio as a key reason to buy

Cons

  • ✗No verified third-party batch testing — the product specs confirm third_party_tested is false, despite some label copy referencing lab testing
  • ✗Gelatin softgel is not suitable for vegans or vegetarians
  • ✗5000 IU daily is a high-dose protocol; without blood monitoring it is easy to overshoot optimal levels long-term
  • ✗K2 at 100 mcg is workable but some clinical protocols use 180–200 mcg alongside high-dose D3

Best For

Adults with confirmed or suspected vitamin D deficiency who want a cost-effective high-dose protocol People over 40 focused on directing calcium to bone rather than arteries Anyone already buying separate D3 and K2 supplements and wanting to consolidate for less money
iHerb £12.96
View full review →

Nutravita Vitamin D3 4000 iu - 4...

Pros

  • ✓Small, easy-to-swallow softgels praised by virtually every reviewer, including those with tablet-swallowing difficulties
  • ✓Excellent value for money — 400 softgels lasts over a year at one-per-day dosing
  • ✓Clean formula with no fillers, bulking agents, or anti-caking agents — just D3, sunflower oil, and gelatin
  • ✓High 4000 IU dose meets medically recommended therapeutic levels for deficiency without needing multiple capsules

Cons

  • ✗Gelatin (bovine) capsule — not suitable for vegetarians or vegans
  • ✗No independent third-party certification (no USP, NSF, or equivalent)
  • ✗4000 IU exceeds general population guidelines; those without confirmed deficiency should consult a doctor before use
  • ✗Not recommended for under-18s per product labelling, limiting household sharing

Best For

UK residents with limited sun exposure during autumn and winter People diagnosed with or at risk of vitamin D deficiency Adults who struggle to swallow large tablets or capsules Those wanting a clean-label supplement with minimal additives Budget-conscious buyers seeking a long-lasting supply
Amazon UK £8.99
View full review →

What does the data say about Vitamin K2 + Vitamin D... vs Nutravita Vitamin D3 4...?

Vitamin K2 + Vitamin D3, 120 Capsules Winner 81.0/100

Pairing D3 with K2 MK-7 is one of the better-evidenced decisions in supplementation, and Nutricost delivers it cleanly at 5000 IU cholecalciferol plus 100 mcg menaquinone-7 per softgel.

Effectiveness
Vitamin K2 + Vit..
82.0/100
Nutravita Vitami..
80.0/100
Ingredient Quality
Vitamin K2 + Vit..
84.0/100
Nutravita Vitami..
77.0/100
Value for Money
Vitamin K2 + Vit..
91.0/100
Nutravita Vitami..
90.0/100
Side Effects
Vitamin K2 + Vit..
87.0/100
Nutravita Vitami..
88.0/100
Certifications
Vitamin K2 + Vit..
42.0/100
Nutravita Vitami..
62.0/100

What are the key differences?

Vitamin K2 + Vitamin D3.. is best for: Adults with confirmed or suspected vitamin D deficiency who want a cost-effective high-dose protocol, People over 40 focused on directing calcium to bone rather than arteries
Nutravita Vitamin D3 40.. is best for: UK residents with limited sun exposure during autumn and winter, People diagnosed with or at risk of vitamin D deficiency

Frequently Asked Questions

Which is better, Vitamin K2 + Vitamin D3, 120 Capsules or Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK? ▼
Vitamin K2 + Vitamin D3, 120 Capsules scores 81.0/100 overall while Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK scores 80.0/100. Vitamin K2 + Vitamin D3, 120 Capsules comes out ahead, scoring higher on effectiveness (82.0 vs 80.0). Vitamin K2 + Vitamin D3, 120 C is best suited for Adults with confirmed or suspected vitamin D deficiency who want a cost-effective high-dose protocol and People over 40 focused on directing calcium to bone rather than arteries. Nutravita Vitamin D3 4000 iu - is better for UK residents with limited sun exposure during autumn and winter and People diagnosed with or at risk of vitamin D deficiency.
Is Vitamin K2 + Vitamin D3, 120 Capsules worth the price compared to Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK? ▼
Vitamin K2 + Vitamin D3, 120 Capsules costs £12.96 while Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK is £8.99. For value, Vitamin K2 + Vitamin D3, 120 Capsules scores 91.0/100 vs Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK's 90.0/100. Vitamin K2 + Vitamin D3, 120 Capsules delivers better value relative to its quality.
Which has fewer side effects? ▼
Vitamin K2 + Vitamin D3, 120 Capsules scores 87.0/100 for side effects (higher means fewer reported issues) while Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK scores 88.0/100. Reviewers report fewer side effects with Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK. For certification and testing, Vitamin K2 + Vitamin scores 42.0/100 vs Nutravita Vitamin D3's 62.0/100. Always consult a healthcare professional before starting any supplement.

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What the Data Says

Why do 97% of UK vitamin D supplements lack third-party certification?

Only 1 out of 35 vitamin D products we scored has independent certification. That's 97% without any third-party verification of purity, potency, or label accuracy.

This is worse than most supplement categories. The reason is simple: UK law doesn't require it, and testing costs money. Most vitamin D brands sell on price alone, especially in the D3-only space where the raw ingredient is cheap. Certification adds cost that budget brands won't absorb.

What does this mean for you? Without third-party testing, you're trusting the manufacturer's label claims. A 2021 study in Nutrients found that vitamin D supplements varied from 52% to 135% of their labelled dose. That's a problem if you're relying on a specific daily intake.

Among the 35 products we scored, the top performers are all from brands with strong manufacturing track records: NOW Foods D3 5000 IU and Thorne Vitamin D + K2 both score 87/100 overall. Thorne holds the highest certification score in the category at 85/100. If independent testing matters to you, that's the product to look at.

Do you need vitamin K2 with high-dose vitamin D?

Probably yes at high doses, and our data backs the pairing. Thorne Vitamin D + K2 Liquid is the only D3+K2 combo product in our 35-product database that scores 87/100 overall, matching the top-ranked D3-only options from NOW Foods. It also holds the highest certification score in the category at 85/100.

Here's the science behind it. Vitamin D increases calcium absorption from food. Vitamin K2 activates proteins that direct that calcium into bones and teeth, keeping it out of your arteries and soft tissue. At standard doses (1000-2000 IU daily), most people get enough K2 from diet to handle the extra calcium. At 4000-5000 IU daily, the calcium load increases enough that K2 becomes a more serious consideration.

The Endocrine Society doesn't yet include K2 in its vitamin D guidelines. But a growing body of research, including a 2019 meta-analysis in International Journal of Molecular Sciences, shows the D3+K2 combination improves bone mineral density more than D3 alone.

If you eat K2-rich foods regularly (natto, hard cheese, egg yolks, chicken liver), a standalone D3 product like NOW Foods D3 5000 IU 360 Softgels (87/100) is a solid choice. If your diet is low in K2, or you're taking 4000+ IU of D3 daily, Thorne D + K2 covers both bases in one product.

Disclaimer: AIScored provides data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.

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