Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count vs Vitamin D3, High Potency, 10,000 IU, 120 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 D3, High Potency, 10,000 IU, 120 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 D3, High Potency, 10,000 IU, 120 Softgels at 82.0/100. Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count wins on ingredient quality, side effects, certifications. Vitamin D3, High Potency, 10,000 IU, 120 Softgels is stronger on effectiveness and value for money.
Which is better: Solgar Vitamin D3 1000 IU (... or Vitamin D3, High Potency, 1...?
NOW Foods Vitamin D3, High Potency, 10,000 IU, 120 Softgels wins with a higher effectiveness score of 86.0 versus Solgar's 81.0, plus it's cheaper at £8.82. Pick Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count instead if you need a low maintenance dose with just safflower oil and gelatin. Its 250 softgels last up to eight months at one a day.
— AIScored Editorial Team
How Do the Scores Compare?
Solgar Vitamin D3 1000 IU (...
Solgar
|
Vitamin D3, High Potency, 1...
NOW Foods
|
|
|---|---|---|
| Overall Score | 83.0 | 82.0 |
| Effectiveness | 81.0/100 |
86.0/100
Best
|
| Ingredient Quality |
89.0/100
Best
|
84.0/100 |
| Value for Money | 86.0/100 |
89.0/100
Best
|
| Side Effects |
92.0/100
Best
|
76.0/100 |
| Certifications |
68.0/100
Best
|
52.0/100 |
| 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 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
What does the data say about Solgar Vitamin D3 1000... vs Vitamin D3, High Poten...?
Solgar and NOW Foods both score 83.0/100 but serve different needs. Solgar's 1000 IU is a maintenance dose for adequate vitamin D, whilst NOW Foods' 10,000 IU targets deficiency correction. The Solgar bottle contains 250 softgels for £11.16 — roughly eight months' supply — using only safflower oil and gelatin. NOW Foods offers D3 in olive oil at £8.82 for 120 softgels, providing better value if taking higher doses infrequently.
Choose Solgar if you need daily winter protection and prefer minimal ingredients without additives. Its small, tasteless softgels support consistent use. Pick NOW Foods if your doctor has identified deficiency and recommends correction therapy, or if you prefer dosing every few days rather than daily. One reviewer reported measurable blood test improvements at the higher dose.
Neither product carries third-party certification. Both deliver softgels reviewers praise as easy to swallow and completely flavourless. If taking high-dose D3, some users add K2 separately for bone health — worth discussing with your GP before starting supplementation.
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 D3, High Potency, 10,000 IU, 120 Softgels? ▼
Is Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count worth the price compared to Vitamin D3, High Potency, 10,000 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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