Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count vs Vitamin D-3, High Potency, 2,000 IU, 240 Softgels
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count and Vitamin D-3, High Potency, 2,000 IU, 240 Softgels.
Last verified: 07 Apr 2026 · Based on 106 reviews
Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count scores 83.0/100 vs Vitamin D-3, High Potency, 2,000 IU, 240 Softgels at 82.0/100. Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count wins on ingredient quality, certifications. Vitamin D-3, High Potency, 2,000 IU, 240 Softgels is stronger on effectiveness and value for money.
Which is better: Solgar Vitamin D3 1000 IU (... or Vitamin D-3, High Potency, ...?
Solgar Vitamin D3 1000 IU (25mcg) Softgels wins with its 83.0/100 score over NOW Foods Vitamin D-3's 82.0/100, plus a cleaner formula using just safflower oil. Pick NOW Foods Vitamin D-3, High Potency, 2,000 IU instead if you want the cheaper £8.82 price and higher 2000 IU dose for better maintenance. Those needing only 1000 IU daily should stick with Solgar's minimal ingredients.
— AIScored Editorial Team
How Do the Scores Compare?
Solgar Vitamin D3 1000 IU (...
Solgar
|
Vitamin D-3, High Potency, ...
NOW Foods
|
|
|---|---|---|
| Overall Score | 83.0 | 82.0 |
| Effectiveness | 81.0/100 |
82.0/100
Best
|
| Ingredient Quality |
89.0/100
Best
|
85.0/100 |
| Value for Money | 86.0/100 |
90.0/100
Best
|
| Side Effects | 92.0/100 |
93.0/100
Best
|
| Certifications |
68.0/100
Best
|
58.0/100 |
| Best Price | £11.16 Amazon UK → |
£8.82
iHerb →
Cheapest
|
| Price per Serving | £0.04 250 servings | N/A |
| Form | Softgels | None |
| Dose | 1000 IU (25mcg) Vitamin D3 | None |
| Third-Party Tested | ✗ No | ✗ No |
| Reviews Analysed | 56 | 50 |
Solgar Vitamin D3 1000 IU (25mcg...
Pros
- ✓Small, easy-to-swallow softgels with no taste or odour — universally noted across reviews
- ✓Exceptionally clean formulation: only safflower oil and gelatin shell, no magnesium stearate or silicon dioxide
- ✓250-count bottle offers excellent long-term value — up to ~8 months supply at 1/day
- ✓Reviewers consistently report improved energy, mood, and immunity — consistent with D3 research evidence
Cons
- ✗1000 IU is a maintenance dose only — insufficient to correct deficiency; those with low D levels typically need 2000–5000 IU under guidance
- ✗Not third-party tested (e.g. NSF, Informed Sport) — limits verification for athletes or those requiring assay confirmation
- ✗Contains bovine gelatin — not suitable for vegans, vegetarians, or some religious dietary requirements (halal concerns raised by reviewers)
- ✗Safflower oil carrier is functional but not as optimal as olive oil or MCT oil for fat-soluble vitamin absorption
Best For
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
What does the data say about Solgar Vitamin D3 1000... vs Vitamin D-3, High Pote...?
Solgar Vitamin D3 1000 IU softgels deliver 25mcg of cholecalciferol in safflower oil inside a gelatin shell while NOW Foods Vitamin D-3 High Potency packs 2000 IU into olive oil softgels. The Solgar version uses a lower maintenance dose that suits daily top-ups whereas the NOW product offers double the strength for those who need a bit more during darker months. Both come as small softgels with no taste or smell yet the carrier oils differ enough to affect absorption slightly for some users. Solgar scores 83/100 overall against NOW's 82/100 but NOW edges effectiveness at 82/100 to Solgar's 81/100 and wins on value at 90/100 compared with 86/100.
Pick Solgar if you want the cleanest formula with just two ingredients and score higher on ingredient quality at 89/100. It works best for people in low-sunlight areas who simply maintain levels rather than fix a shortfall and the 250-count bottle gives eight months supply for £11.16. Choose NOW instead when budget matters more at £8.82 for 240 capsules or when you prefer the higher 2000 IU dose for winter top-ups and family sharing. Families often grab it after finishing a stronger prescription course because the softgels suit adults and kids alike.
Both bottles last around eight months at one a day and the softgels swallow easily without any aftertaste. The bovine gelatin rules out vegans for either option so check that first. Solgar feels slightly purer for minimalists while NOW gives better value and potency for the same daily habit.
Solgar Vitamin D3 1000 IU is a well-regarded maintenance-dose supplement in a 250-count softgel format, praised by reviewers for its small capsule size, easy swallowability, and clean formulation.
What are the key differences?
Frequently Asked Questions
Which is better, Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count or Vitamin D-3, High Potency, 2,000 IU, 240 Softgels? ▼
Is Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count worth the price compared to Vitamin D-3, High Potency, 2,000 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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