Skip to content

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

83.0
Quick Answer

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 (...
Vitamin D3, High Potency, 1...
Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count
Solgar Vitamin D3 1000 IU (...
Solgar
Vitamin D3, High Potency, 10,000 IU, 120 Softgels
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

Individuals maintaining adequate vitamin D levels rather than correcting deficiency Those in low-sunlight climates or who work indoors year-round People seeking a clean, minimal-ingredient daily supplement Older adults with reduced cutaneous D3 synthesis Budget-conscious buyers wanting a large-count reliable supply
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
View full review →

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 (25mcg) Softgels - 250 Count Winner 83.0/100

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.

Effectiveness
Solgar Vitamin D..
81.0/100
Vitamin D3, High..
86.0/100
Ingredient Quality
Solgar Vitamin D..
89.0/100
Vitamin D3, High..
84.0/100
Value for Money
Solgar Vitamin D..
86.0/100
Vitamin D3, High..
89.0/100
Side Effects
Solgar Vitamin D..
92.0/100
Vitamin D3, High..
76.0/100
Certifications
Solgar Vitamin D..
68.0/100
Vitamin D3, High..
52.0/100

What are the key differences?

Solgar Vitamin D3 1000 .. is best for: Individuals maintaining adequate vitamin D levels rather than correcting deficiency, Those in low-sunlight climates or who work indoors year-round
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, Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count or Vitamin D3, High Potency, 10,000 IU, 120 Softgels?
Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count scores 83.0/100 overall while Vitamin D3, High Potency, 10,000 IU, 120 Softgels scores 82.0/100. Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count comes out ahead, scoring higher on effectiveness (81.0 vs 86.0). Solgar Vitamin D3 1000 IU (25m is best suited for Individuals maintaining adequate vitamin D levels rather than correcting deficiency and Those in low-sunlight climates or who work indoors year-round. 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 Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count worth the price compared to Vitamin D3, High Potency, 10,000 IU, 120 Softgels?
Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count costs £11.16 while Vitamin D3, High Potency, 10,000 IU, 120 Softgels is £8.82. For value, Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count scores 86.0/100 vs Vitamin D3, High Potency, 10,000 IU, 120 Softgels's 89.0/100. Vitamin D3, High Potency, 10,000 IU, 120 Softgels delivers better value relative to its quality.
Which has fewer side effects?
Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count scores 92.0/100 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 Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count. For certification and testing, Solgar Vitamin D3 10 scores 68.0/100 vs Vitamin D3, High Pot's 52.0/100. Always consult a healthcare professional before starting any supplement.

Related Product Comparisons

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.

Feedback & Suggestions

Spotted an issue? Wrong price, incorrect data, or something else off? Let us know and we'll fix it.

Missing a product you'd like us to review? Tell us the product name and we'll consider adding it.