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Vitamin D-3, High Potency, 2,000 IU, 240 Softgels vs Vitamin K2 + Vitamin D3, 120 Capsules

Side-by-side comparison of scores, ingredients, prices and real customer feedback for Vitamin D-3, High Potency, 2,000 IU, 240 Softgels and Vitamin K2 + Vitamin D3, 120 Capsules.

Last verified: 07 Apr 2026 · Based on 99 reviews

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82.0
Quick Answer

Vitamin D-3, High Potency, 2,000 IU, 240 Softgels scores 82.0/100 vs Vitamin K2 + Vitamin D3, 120 Capsules at 81.0/100. Vitamin D-3, High Potency, 2,000 IU, 240 Softgels wins on ingredient quality, side effects, certifications. Vitamin K2 + Vitamin D3, 120 Capsules is stronger on value for money.

Which is better: Vitamin D-3, High Potency, ... or Vitamin K2 + Vitamin D3, 12...?

NOW Foods' Vitamin D-3 wins on value for maintenance — £8.82 for 240 softgels versus Nutricost's K2 + Vitamin D3 at £12.96. Pick Nutricost instead if you're correcting a deficiency or want K2 as MK-7 to direct calcium to bone.

— AIScored Editorial Team

How Do the Scores Compare?

Vitamin D-3, High Potency, ...
Vitamin K2 + Vitamin D3, 12...
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels
Vitamin D-3, High Potency, ...
NOW Foods
 Vitamin K2 + Vitamin D3, 120 Capsules
Vitamin K2 + Vitamin D3, 12...
Nutricost
Overall Score 82.0 81.0
Effectiveness 82.0/100
Best
 82.0/100
Best
Ingredient Quality 85.0/100
Best
 84.0/100
Value for Money 90.0/100 91.0/100
Best
Side Effects 93.0/100
Best
 87.0/100
Certifications 58.0/100
Best
 42.0/100
Best Price £8.82 iHerb →
Cheapest
 £12.96 iHerb →
Form None None
Dose None None
Third-Party Tested ✗ No ✗ No
Reviews Analysed 50 49

Vitamin D-3, High Potency, 2,000...

Pros

  • ✓Small, tasteless softgels praised by nearly every reviewer — easy to swallow for adults and children alike
  • ✓240-count bottle lasts 8 months at one per day, making the per-dose cost very low
  • ✓Cholecalciferol delivered in olive oil — correct form and carrier for fat-soluble vitamin absorption
  • ✓Reviewers consistently report energy, mood, and immunity improvements over autumn-winter use

Cons

  • ✗Bovine gelatin capsule rules out vegans and some vegetarians — no plant-based equivalent in this line
  • ✗No independent third-party potency or purity testing (no iTested, NSF, or USP verification)
  • ✗2,000 IU is a maintenance dose, not a correction dose — several reviewers with confirmed deficiency needed higher amounts or separate high-dose protocols
  • ✗One reviewer flagged the lid pops open unexpectedly rather than staying sealed between uses

Best For

Adults maintaining adequate vitamin D levels through autumn and winter with limited sun exposure Families wanting a single affordable bottle that covers multiple people at a daily dose People who have corrected a deficiency with a higher-dose protocol and now need a straightforward maintenance supplement Anyone who struggles with large capsules — the softgel size is a genuine practical advantage here
iHerb £8.82
View full review →

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 →

What does the data say about Vitamin D-3, High Pote... vs Vitamin K2 + Vitamin D...?

NOW Foods' 2000 IU formula (£8.82, 87/100) is a straightforward maintenance dose — five times the RDA and proven safe for healthy adults. You get 240 softgels lasting roughly eight months, making it exceptional value at 94/100. The softgels are small, tasteless, and easy to swallow. Nutricost's version (£12.96, 83/100) jumps to 5000 IU with added MK-7 vitamin K2 at 100 mcg, a stronger formulation aimed at correcting deficiency rather than maintaining levels.

K2 matters if you're over 40 or concerned about calcium depositing in arteries. Clinical trials use K2 in this range, and MK-7 is the most studied form for bone and cardiovascular health. Sunflower oil in the capsule helps absorption without requiring food. However, Nutricost's testing claims lack transparency; they mention independent lab work but don't publish Certificates of Analysis like NOW or Thorne do. Both use gelatin, ruling out vegans.

Choose NOW for maintenance dosing and unmatched value. Choose Nutricost if you've tested deficient or need a higher therapeutic dose with bone support.

Vitamin D-3, High Potency, 2,000 IU, 240 Softgels Winner 82.0/100

NOW Foods delivers 2,000 IU of cholecalciferol — the most bioavailable form of vitamin D — suspended in olive oil inside a small bovine gelatin softgel.

Effectiveness
Vitamin D-3, Hig..
82.0/100
Vitamin K2 + Vit..
82.0/100
Ingredient Quality
Vitamin D-3, Hig..
85.0/100
Vitamin K2 + Vit..
84.0/100
Value for Money
Vitamin D-3, Hig..
90.0/100
Vitamin K2 + Vit..
91.0/100
Side Effects
Vitamin D-3, Hig..
93.0/100
Vitamin K2 + Vit..
87.0/100
Certifications
Vitamin D-3, Hig..
58.0/100
Vitamin K2 + Vit..
42.0/100

What are the key differences?

Vitamin D-3, High Poten.. is best for: Adults maintaining adequate vitamin D levels through autumn and winter with limited sun exposure, Families wanting a single affordable bottle that covers multiple people at a daily dose
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

Frequently Asked Questions

Which is better, Vitamin D-3, High Potency, 2,000 IU, 240 Softgels or Vitamin K2 + Vitamin D3, 120 Capsules? ▼
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels scores 82.0/100 overall while Vitamin K2 + Vitamin D3, 120 Capsules scores 81.0/100. Vitamin D-3, High Potency, 2,000 IU, 240 Softgels comes out ahead, scoring higher on effectiveness (82.0 vs 82.0). Vitamin D-3, High Potency, 2,0 is best suited for Adults maintaining adequate vitamin D levels through autumn and winter with limited sun exposure and Families wanting a single affordable bottle that covers multiple people at a daily dose. Vitamin K2 + Vitamin D3, 120 C is better 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.
Is Vitamin D-3, High Potency, 2,000 IU, 240 Softgels worth the price compared to Vitamin K2 + Vitamin D3, 120 Capsules? ▼
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels costs £8.82 while Vitamin K2 + Vitamin D3, 120 Capsules is £12.96. For value, Vitamin D-3, High Potency, 2,000 IU, 240 Softgels scores 90.0/100 vs Vitamin K2 + Vitamin D3, 120 Capsules's 91.0/100. Vitamin K2 + Vitamin D3, 120 Capsules delivers better value relative to its quality.
Which has fewer side effects? ▼
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels scores 93.0/100 for side effects (higher means fewer reported issues) while Vitamin K2 + Vitamin D3, 120 Capsules scores 87.0/100. Reviewers report fewer side effects with Vitamin D-3, High Potency, 2,000 IU, 240 Softgels. For certification and testing, Vitamin D-3, High Po scores 58.0/100 vs Vitamin K2 + Vitamin's 42.0/100. 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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