Vitamin D3, High Potency, 10,000 IU, 120 Softgels vs Vitamin K2 + Vitamin D3, 120 Capsules
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Vitamin D3, High Potency, 10,000 IU, 120 Softgels and Vitamin K2 + Vitamin D3, 120 Capsules.
Last verified: 07 Apr 2026 · Based on 99 reviews
Vitamin D3, High Potency, 10,000 IU, 120 Softgels scores 82.0/100 vs Vitamin K2 + Vitamin D3, 120 Capsules at 81.0/100. Vitamin D3, High Potency, 10,000 IU, 120 Softgels wins on effectiveness, certifications. Vitamin K2 + Vitamin D3, 120 Capsules is stronger on value for money and side effects.
Which is better: Vitamin D3, High Potency, 1... or Vitamin K2 + Vitamin D3, 12...?
The NOW Foods 10,000 IU D3 wins on both price (£8.82 vs £12.96) and score (82 vs 81). Go for the Nutricost K2 + D3 instead if you want both vitamins in one product rather than buying separately.
— AIScored Editorial Team
How Do the Scores Compare?
Vitamin D3, High Potency, 1...
NOW Foods
|
Vitamin K2 + Vitamin D3, 12...
Nutricost
|
|
|---|---|---|
| Overall Score | 82.0 | 81.0 |
| Effectiveness |
86.0/100
Best
|
82.0/100 |
| Ingredient Quality |
84.0/100
Best
|
84.0/100
Best
|
| Value for Money | 89.0/100 |
91.0/100
Best
|
| Side Effects | 76.0/100 |
87.0/100
Best
|
| Certifications |
52.0/100
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 D3, High Potency, 10,000...
Pros
- ✓10,000 IU of D3 (cholecalciferol) — the superior form over D2, and genuinely useful for correcting significant deficiency quickly
- ✓Softgel in olive oil base supports fat-soluble absorption; reviewers consistently take it with fat-containing meals for best results
- ✓Multiple reviewers confirm measurable increases in blood vitamin D levels after a course of supplementation
- ✓Small capsules praised across dozens of reviews — easy to swallow, no taste or smell
Cons
- ✗No K2 included — a recurring complaint, as several reviewers specifically note they purchase K2 separately when using this high dose
- ✗Contains bovine gelatin; not suitable for vegans or vegetarians
- ✗No third-party testing; quality assurance relies entirely on NOW Foods' in-house GMP processes
- ✗10,000 IU requires blood level monitoring — several reviewers warn about the risk of overshooting if taken daily without testing
Best For
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
What does the data say about Vitamin D3, High Poten... vs Vitamin K2 + Vitamin D...?
Product A packs a hefty 10,000 IU of straight vitamin D3 in each of its 120 softgels while Product B combines 5000 IU of D3 with K2 as MK-7 in 120 capsules. The higher dose in A makes it hit harder for quick fixes and the olive oil base helps absorption when taken with food. B adds that longer-acting MK-7 form of K2 which many people pair with D3 anyway to guide calcium properly. Both use softgel formats in oil yet A relies on bovine gelatin and B sticks to sunflower oil instead.
Pick A if you have blood tests showing clear deficiency and live up north with little sun since its 82.0/100 overall score edges out B's 81.0/100 mainly through stronger 86.0/100 effectiveness. Those watching every penny will like its £8.82 price and 89.0/100 value rating. Go for B when you want the convenience of both vitamins in one bottle especially if over 40 and focused on bone health as its 91.0/100 value score beats A's 89.0/100 at £12.96. Ingredient quality sits tied at 84.0/100 for each.
Both products avoid strong tastes and swallow easily though some find the softgels on the larger side. Neither suits vegans or vegetarians because of the gelatin. Check with your doctor before starting high doses like these.
10,000 IU of cholecalciferol in a softgel with extra virgin olive oil — a sensible delivery for a fat-soluble vitamin.
What are the key differences?
Frequently Asked Questions
Which is better, Vitamin D3, High Potency, 10,000 IU, 120 Softgels or Vitamin K2 + Vitamin D3, 120 Capsules? ▼
Is Vitamin D3, High Potency, 10,000 IU, 120 Softgels worth the price compared to Vitamin K2 + Vitamin D3, 120 Capsules? ▼
Which has fewer side effects? ▼
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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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