Vitamin D-3, High Potency, 2,000 IU, 240 Softgels vs Vitamin D-3, High Potency, 5,000 IU, 240 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, 240 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, 240 Softgels at 82.0/100. Vitamin D-3, High Potency, 2,000 IU, 240 Softgels wins on ingredient quality, side effects, certifications. Vitamin D-3, High Potency, 5,000 IU, 240 Softgels is stronger on effectiveness and value for money.
Which is better: Vitamin D-3, High Potency, ... or Vitamin D-3, High Potency, ...?
NOW Foods 2,000 IU wins on value (£8.82 vs £11.93, score 87 vs 85) and suits most people as a safe daily maintenance dose. Choose the 5,000 IU only if you have confirmed deficiency and are monitoring blood levels with a doctor.
— 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 |
85.0/100
Best
|
| Ingredient Quality |
85.0/100
Best
|
83.0/100 |
| Value for Money | 90.0/100 |
91.0/100
Best
|
| Side Effects |
93.0/100
Best
|
87.0/100 |
| Certifications |
58.0/100
Best
|
52.0/100 |
| Best Price |
£8.82
iHerb →
Cheapest
|
£11.93 iHerb → |
| 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
- ✓Cholecalciferol (D3) in olive oil — correct form and fat-soluble delivery for meaningful absorption
- ✓240 softgels at 5,000 IU is exceptional value; multiple reviewers explicitly note how long a single purchase lasts
- ✓Tiny, tasteless, odourless softgels — easy to swallow, praised consistently across dozens of reviews
- ✓Several reviewers confirm blood levels normalised after taking this at a doctor-recommended 5,000 IU dose
Cons
- ✗Not vegan — bovine gelatin capsule shell rules it out for plant-based users
- ✗No independent third-party purity or potency testing (no NSF, USP, or equivalent verification)
- ✗5,000 IU is a therapeutic dose, not a maintenance dose — appropriate only with confirmed deficiency and blood monitoring
- ✗No K2 included; several reviewers specifically flag that K2 should be taken separately to direct calcium properly
Best For
What does the data say about Vitamin D-3, High Pote... vs Vitamin D-3, High Pote...?
Both products are the same cholecalciferol-in-olive-oil formula from NOW Foods, so the real question here is dose. The 2,000 IU version costs £8.82 for 240 softgels — that's eight months of daily supplementation at a price that's difficult to argue with. The 5,000 IU version costs £11.93 for the same count, scoring slightly higher on effectiveness (85/100 versus 82/100) and marginally better on value (91/100 versus 90/100) despite the higher price, which tells you something about how far each bottle stretches. Ingredient quality goes to the 2,000 IU bottle at 85/100 compared to 83/100, though the difference is small enough that it shouldn't drive your decision on its own.
The dose is what actually separates them. The 2,000 IU is a sensible maintenance level — if you're generally healthy, spend some time outdoors in warmer months, and just want to cover yourself through autumn and winter, this is the one. It also suits families where a single bottle needs to cover several people. The 5,000 IU is a better fit if you've had a blood test confirming deficiency or a doctor has specifically recommended a higher dose, or if you live somewhere with reliably poor sunlight year-round and need to move the needle meaningfully.
Practically, both share the same softgel design — small, tasteless, odourless — and reviewers across both products consistently mention how easy they are to swallow. The olive oil carrier ensures the fat-soluble vitamin is absorbed properly regardless of which dose you pick. One limitation applies equally to both: the capsule shell is bovine gelatin, so neither works for vegans or some vegetarians. Both products score identically overall at 82/100, so if you're deficient or under medical guidance to take more, go with the 5,000 IU. If you're maintaining rather than correcting, the 2,000 IU at £8.82 is the more appropriate choice.
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, 240 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, 240 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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