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Vitamin D-3, High Potency, 2,000 IU, 240 Softgels vs Vitamin D3, High Potency, 10,000 IU, 120 Softgels

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 D3, High Potency, 10,000 IU, 120 Softgels.

Last verified: 07 Apr 2026 · Based on 100 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 D3, High Potency, 10,000 IU, 120 Softgels at 82.0/100. Vitamin D-3, High Potency, 2,000 IU, 240 Softgels wins on ingredient quality, value for money, side effects. Vitamin D3, High Potency, 10,000 IU, 120 Softgels is stronger on effectiveness.

Which is better: Vitamin D-3, High Potency, ... or Vitamin D3, High Potency, 1...?

Both score 82/100 at £8.82, but the 2,000 IU offers better value — it lasts 8 months versus 4 for the 10,000 IU. Pick the 10,000 IU only if a blood test confirms deficiency, though you'll need to buy K2 separately.

— AIScored Editorial Team

How Do the Scores Compare?

Vitamin D-3, High Potency, ...
Vitamin D3, High Potency, 1...
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels
Vitamin D-3, High Potency, ...
NOW Foods
 Vitamin D3, High Potency, 10,000 IU, 120 Softgels
Vitamin D3, High Potency, 1...
NOW Foods
Overall Score 82.0 82.0
Effectiveness 82.0/100 86.0/100
Best
Ingredient Quality 85.0/100
Best
 84.0/100
Value for Money 90.0/100
Best
 89.0/100
Side Effects 93.0/100
Best
 76.0/100
Certifications 58.0/100
Best
 52.0/100
Best Price £8.82 iHerb →
Cheapest
 £8.82 iHerb →
Cheapest
Form None None
Dose None None
Third-Party Tested ✗ No ✗ No
Reviews Analysed 50 50

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 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

People with confirmed vitamin D deficiency (blood test showing low levels) needing fast correction Those in northern latitudes or with minimal sun exposure year-round Budget-conscious buyers who want a straightforward, high-dose D3 without proprietary blends or fillers
iHerb £8.82
View full review →

What does the data say about Vitamin D-3, High Pote... vs Vitamin D3, High Poten...?

Both NOW Foods products deliver D3 as cholecalciferol in extra virgin olive oil — the correct form for a fat-soluble vitamin. Product A contains 10,000 IU per softgel across 120 capsules and scores 83.0/100. Product B contains 2,000 IU per softgel across 240 capsules and scores 80.0/100. The dosage difference drives everything else: Product A is for correction, Product B for daily maintenance.

Choose Product A if your doctor has confirmed vitamin D deficiency and wants faster results. Reviewers report measurable blood test improvements. Choose Product B for ongoing household supplementation, especially through winter months or if multiple family members will use it. At one daily, the 240-bottle lasts roughly eight months.

Both cost £8.82 and contain tiny, tasteless softgels universally praised for swallowability. Neither includes vitamin K2, which many users add separately when taking high-dose D3. Neither product carries third-party testing certification. For pure value, Product B stretches further with twice the capsule count, though the 2,000 IU dose won't address clinical deficiency.

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 D3, High..
86.0/100
Ingredient Quality
Vitamin D-3, Hig..
85.0/100
Vitamin D3, High..
84.0/100
Value for Money
Vitamin D-3, Hig..
90.0/100
Vitamin D3, High..
89.0/100
Side Effects
Vitamin D-3, Hig..
93.0/100
Vitamin D3, High..
76.0/100
Certifications
Vitamin D-3, Hig..
58.0/100
Vitamin D3, High..
52.0/100

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 D3, High Potenc.. is best for: People with confirmed vitamin D deficiency (blood test showing low levels) needing fast correction, Those in northern latitudes or with minimal sun exposure year-round

Frequently Asked Questions

Which is better, Vitamin D-3, High Potency, 2,000 IU, 240 Softgels or Vitamin D3, High Potency, 10,000 IU, 120 Softgels? ▼
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels scores 82.0/100 overall while Vitamin D3, High Potency, 10,000 IU, 120 Softgels scores 82.0/100. Both score equally overall — the difference comes down to individual dimensions. 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 D3, High Potency, 10,0 is better for People with confirmed vitamin D deficiency (blood test showing low levels) needing fast correction and Those in northern latitudes or with minimal sun exposure year-round.
Is Vitamin D-3, High Potency, 2,000 IU, 240 Softgels worth the price compared to Vitamin D3, High Potency, 10,000 IU, 120 Softgels? ▼
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels costs £8.82 while Vitamin D3, High Potency, 10,000 IU, 120 Softgels is £8.82. For value, Vitamin D-3, High Potency, 2,000 IU, 240 Softgels scores 90.0/100 vs Vitamin D3, High Potency, 10,000 IU, 120 Softgels's 89.0/100. Vitamin D-3, High Potency, 2,000 IU, 240 Softgels 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 D3, High Potency, 10,000 IU, 120 Softgels scores 76.0/100. 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 D3, High Pot's 52.0/100. 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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