Vitamin D-3, High Potency, 2,000 IU, 240 Softgels vs Vitamin D-3, High Potency, 5,000 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 D-3, High Potency, 5,000 IU, 120 Softgels.
Last verified: 07 Apr 2026 · Based on 100 reviews
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels scores 82.0/100 vs Vitamin D-3, High Potency, 5,000 IU, 120 Softgels at 82.0/100. Vitamin D-3, High Potency, 2,000 IU, 240 Softgels wins on ingredient quality, side effects. Vitamin D-3, High Potency, 5,000 IU, 120 Softgels is stronger on effectiveness.
Which is better: Vitamin D-3, High Potency, ... or Vitamin D-3, High Potency, ...?
NOW Foods 2,000 IU edges ahead with a higher overall score (87 vs 85) and costs less per softgel across a longer supply. The 5,000 IU version suits those with a confirmed deficiency needing to correct low levels quickly.
— AIScored Editorial Team
How Do the Scores Compare?
Vitamin D-3, High Potency, ...
NOW Foods
|
Vitamin D-3, High Potency, ...
NOW Foods
|
|
|---|---|---|
| Overall Score | 82.0 | 82.0 |
| Effectiveness | 82.0/100 |
86.0/100
Best
|
| Ingredient Quality |
85.0/100
Best
|
83.0/100 |
| Value for Money |
90.0/100
Best
|
90.0/100
Best
|
| Side Effects |
93.0/100
Best
|
87.0/100 |
| Certifications |
58.0/100
Best
|
58.0/100
Best
|
| Best Price | £8.82 iHerb → |
£6.74
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
Vitamin D-3, High Potency, 5,000...
Pros
- ✓D3 (cholecalciferol) in an olive oil and safflower oil base — the most bioavailable form, in the most appropriate delivery medium for a fat-soluble vitamin
- ✓Multiple reviewers confirmed blood test levels returning to normal after consistent use, including doctor-prescribed cases of significant deficiency
- ✓Small softgels praised consistently as easy to swallow, tasteless, and gentle on the stomach
- ✓5,000 IU therapeutic dose in a single capsule — practical for deficiency correction without splitting doses
Cons
- ✗Not third-party tested — no independent lab has verified potency or purity; specs confirm this
- ✗Not vegan or vegetarian: bovine gelatin capsule
- ✗5,000 IU exceeds standard maintenance levels and is not appropriate for unsupervised long-term use without periodic blood monitoring
- ✗Does not include K2, which several reviewers note is needed for proper calcium routing — requires a separate purchase
Best For
What does the data say about Vitamin D-3, High Pote... vs Vitamin D-3, High Pote...?
Both options are NOW Foods D3 softgels using cholecalciferol in an oil base — the right form for a fat-soluble vitamin. The real split is dose. The 2,000 IU version at £8.82 gives you 240 softgels, which runs to roughly eight months of daily use. The 5,000 IU version costs less up front at £6.74 but delivers 120 softgels — a higher dose per capsule, so the bottle moves faster. Both score 82.0/100 overall and tie on value at 90.0/100. Where they differ: the 5,000 IU scores higher on effectiveness (86/100 versus 82/100), while the 2,000 IU edges ahead on ingredient quality (85/100 versus 83/100).
The 2,000 IU is the cleaner fit for maintenance — people who already have decent levels and want a straightforward daily supplement through the darker months, or families running one bottle across multiple people. The 5,000 IU is the better pick for anyone dealing with confirmed deficiency or living somewhere with very little sunlight year-round. Reviewers of the higher-dose version specifically mentioned blood levels returning to normal after consistent use, which the 2,000 IU data does not reflect.
Both use bovine gelatin capsules, so neither works for vegans or vegetarians. The softgels are small and tasteless in both cases — that consistency across the range is genuine, with reviewers of each version saying they're easy to swallow and gentle on the stomach.
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.
What are the key differences?
Frequently Asked Questions
Which is better, Vitamin D-3, High Potency, 2,000 IU, 240 Softgels or Vitamin D-3, High Potency, 5,000 IU, 120 Softgels? ▼
Is Vitamin D-3, High Potency, 2,000 IU, 240 Softgels worth the price compared to Vitamin D-3, High Potency, 5,000 IU, 120 Softgels? ▼
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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