We Tested 35 Vitamin D in the UK — Scores, Reviews & Prices
Vitamin D3 supplements for bone health, immunity, and mood. Essential for UK residents with limited sunlight.
We analysed 35 vitamin d using currently available review and product data from public sources. We evaluate each product across six categories — effectiveness, ingredient quality, value for money, side effects, certifications, and overall score — so you can make an informed decision without spending hours reading individual reviews.
🏆 View Best Vitamin D 2026 Rankings →What are the best vitamin d in 2026?
According to the AIScored 0–100 scoring system, the highest-rated vitamin d in the UK are: Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count (83.0/100), Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml (83.0/100), Vitamin D-3, High Potency, 5,000 IU, 120 Softgels (82.0/100). Rankings are based on 35 products scored across effectiveness, ingredient quality, value for money, side effects, and certifications.
| Rank | Product | Brand | Score | Price |
|---|---|---|---|---|
| #1 | Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count | Solgar | 83.0/100 | £11.16 |
| #2 | Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml | Nutri Advanced | 83.0/100 | £19.95 |
| #3 | Vitamin D-3, High Potency, 5,000 IU, 120 Softgels | NOW Foods | 82.0/100 | £6.74 |
| #4 | Vitamin D3, High Potency, 10,000 IU, 120 Softgels | NOW Foods | 82.0/100 | £8.82 |
| #5 | Vitamin D-3, High Potency, 5,000 IU, 240 Softgels | NOW Foods | 82.0/100 | £11.93 |
| #6 | Vitamin D-3, High Potency, 2,000 IU, 240 Softgels | NOW Foods | 82.0/100 | £8.82 |
| #7 | Vegavero Vitamin D3 7000 IU + 200 µg Vitamin K2 | Vegavero | 81.0/100 | — |
| #8 | Vitamin D3 5000 IU | Thorne | 81.0/100 | — |
| #9 | Vitamin K2 + Vitamin D3, 120 Capsules | Nutricost | 81.0/100 | £12.96 |
| #10 | Nutravita Vitamin D3 4000 iu - 400 High Strength Eas... | Nutravita | 80.0/100 | £8.99 |
35 products
Which vitamin d rank highest in 2026?
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Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count
Solgar
Solgar Vitamin D3 1000 IU is a well-regarded maintenance-dose supplement in a 250-count softgel format, praised by revie...
Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml
Nutri Advanced
Nutri Advanced Vitamin D3 with K2 Liquid Drops is a practitioner-grade UK supplement combining cholecalciferol (D3) and ...
Vitamin D-3, High Potency, 5,000 IU, 120 Softgels
NOW Foods
5,000 IU of cholecalciferol per softgel puts this firmly in therapeutic territory — a dose multiple reviewers had valida...
Vitamin D3, High Potency, 10,000 IU, 120 Softgels
NOW Foods
10,000 IU of cholecalciferol in a softgel with extra virgin olive oil — a sensible delivery for a fat-soluble vitamin. T...
Vitamin D-3, High Potency, 5,000 IU, 240 Softgels
NOW Foods
5,000 IU of cholecalciferol delivered in an extra virgin olive oil base — the fat-soluble carrier is correct science, no...
Vitamin D-3, High Potency, 2,000 IU, 240 Softgels
NOW Foods
NOW Foods delivers 2,000 IU of cholecalciferol — the most bioavailable form of vitamin D — suspended in olive oil inside...
Vegavero Vitamin D3 7000 IU + 200 µg Vitamin K2
Vegavero
Vegavero Vitamin D3 7000 IU + 200 µg Vitamin K2 is a once-weekly high-dose depot tablet designed for convenient suppleme...
Vitamin D3 5000 IU
Thorne
Thorne's Vitamin D3 5000 IU is a high-potency cholecalciferol supplement from one of the most rigorously tested suppleme...
Vitamin K2 + Vitamin D3, 120 Capsules
Nutricost
Pairing D3 with K2 MK-7 is one of the better-evidenced decisions in supplementation, and Nutricost delivers it cleanly a...
Nutravita Vitamin D3 4000 iu - 400 High Strength Easy to Swallow Premium Softgels - Over A Year's Supply - Max Strength Vitamin D3 Cholecalciferol Supplement - Manufactured in The UK
Nutravita
Nutravita Vitamin D3 4000 IU is a high-strength cholecalciferol supplement in a clean softgel format, manufactured in th...
Vitamin D3, 125 mcg (5,000 IU), 90 Fish Gelatin Softgels
California Gold Nutrition
5,000 IU of cholecalciferol in safflower oil-based fish gelatin softgels — a therapeutic dose product built for correcti...
Vitamin D3, 125 mcg (5,000 IU), 360 Fish Gelatin Softgels
California Gold Nutrition
California Gold Nutrition's 5,000 IU D3 uses cholecalciferol — the form your body produces from sunlight — suspended in ...
BetterYou Vitamin D3 3000IU Daily Oral Spray 15ml
BetterYou
BetterYou Vitamin D3 3000IU Daily Oral Spray is a UK-made sublingual spray that delivers cholecalciferol via buccal abso...
Vegavero Vitamins D3 K2 Oil
Vegavero
Vegavero Vitamins D3 K2 Oil combines algae-derived D3 (1,000 IU) with K2VITAL MK-7 (100 µg) in an oil capsule designed f...
Vitamin D3, Max Potency, 50,000 IU, 50 Capsules
NOW Foods
50,000 IU is a genuine therapeutic dose — not a daily supplement but a weekly correction tool for confirmed severe defic...
Vitamin D3 2000iu - 60 Caps
Viridian
Viridian's Vitamin D3 2000 IU is a vegan-friendly supplement sourced from lichen, positioning it above most D3 products ...
Vitamin D3 + K2, 60 Veg Capsules
California Gold Nutrition
California Gold Nutrition pairs cholecalciferol (D3) with MK-7 menaquinone — the long-acting form of K2 — in a single ve...
Vitamin D3, 2,000 IU, 120 Capsules
NOW Foods
NOW Foods delivers 2,000 IU of cholecalciferol — the most bioavailable D3 form — dissolved in extra virgin olive oil and...
Nordic Naturals Omega-3 D3 Softgels 60 Count
Nordic Naturals
Nordic Naturals Omega-3 D3 is a well-regarded combination supplement delivering 690mg EPA+DHA alongside 1000 IU vitamin ...
Vitamin D + K2, 1 fl oz (30 ml)
Thorne
Thorne's D3 + K2 liquid delivers 1,000 IU cholecalciferol and 200 mcg K2 as MK-4 per two drops, suspended in MCT oil for...
Vitamin D3, 50 mcg (2,000 IU), 90 Fish Gelatin Softgels
California Gold Nutrition
At 2,000 IU of cholecalciferol in safflower oil, this is the right form and delivery mechanism for a fat-soluble vitamin...
Baby Vitamin D3 Drops, 10 mcg (400 IU), 10ml (0.34 fl oz)
California Gold Nutrition
One drop delivers exactly 400 IU (10 mcg) of cholecalciferol — the dose the American Academy of Pediatrics recommends fo...
Vitamin D3, 50 mcg (2,000 IU), 360 Fish Gelatin Softgels
California Gold Nutrition
At 2,000 IU of cholecalciferol per softgel, this sits at the lower end of what most adults need for repletion — adequate...
Kirkland Signature Vitamin D3 2000 IU Softgels 600 Count
Kirkland
Kirkland Signature Vitamin D3 2000 IU is a straightforward, no-frills cholecalciferol supplement sold in bulk 600-count ...
Vitamin D3 & K2, 120 Capsules
NOW Foods
NOW Foods pairs 1,000 IU of D3 with 45 mcg of K2 in a vegetarian capsule — a sensible combination that reviewers consist...
Vitamin D3 1000IU - 90 Caps
Viridian
Viridian Vitamin D3 1000IU is a lichen-sourced, plant-based D3 supplement manufactured in the UK with a notably clean fo...
Calcium Citrate with Vitamin D3 60 Tablets
Solgar
Solgar Calcium Citrate with Vitamin D3 is a well-regarded bone health supplement from one of the supplement industry's m...
Carlson Super Daily D3 2000 IU Softgels 365 Count
Carlson
Carlson Super Daily D3 2000 IU is a straightforward vitamin D3 softgel from a well-established US supplement brand found...
Vegan Vitamin D 1000iu Tablets - 180 Easy-Swallow Plant-Based Algae Vitamin D Tablets, 6 Month Supply - VIT D3 High Strength Immune Support - Highest Grade Certified UK Made Vegan Vitamin D3 1000iu
Nutrition Geeks
Nutrition Geeks Vegan Vitamin D3 1000iu delivers cholecalciferol sourced from algae in a compact, easy-swallow tablet fo...
Nutrition Geeks, Vitamin D 4000 iu - 1 Year Supply, 365 Easy-Swallow Tablets Vegetarian D3 iu, High Strength Supplet UK Made VIT & Vitamins Awarded by The Independent
Nutrition Geeks
Nutrition Geeks Vitamin D3 4000 IU is a UK-made, year-supply supplement in an unusually compact 6mm tablet format, recei...
Vitamin D 1000iu - 1 Year Supply, 365 Easy-Swallow Vitamin D Tablets, Vegetarian D3, High Strength Immune Support Supplement - Awarded by The Independent UK
Nutrition Geeks
Nutrition Geeks Vitamin D3 1000IU offers a full year's supply of small, easy-swallow vegetarian tablets at a competitive...
Vitamin D3 1000 IU, 365 Tablets
Bulk
Bulk's Vitamin D3 1000 IU offers a full year's supply of cholecalciferol at the NHS-recommended daily dose, making it on...
WILD NUTRITION Food-Grown Teen Boy Daily Multi Nutrient
Wild Nutrition
Wild Nutrition's Food-Grown Teen Boy Daily Multi Nutrient is a premium multinutrient capsule formulated for teenage boys...
Vitamin D3 1000iu 60 Vitagummies
Bioglan
Bioglan Vitamin D3 1000IU VitaGummies are pectin-based, vegetarian chewable gummies delivering a moderate dose of vitami...
Calcium Magnesium Zinc with Vitamin D3, 100 Coated Tablets
Nature's Bounty
Several reviewers noticed leg cramps disappearing within a couple of weeks, and one user confirmed via blood tests that ...
What are the most popular uses for vitamin d?
Filter products by common goals and user profiles in this category.
How do the top vitamin d compare head-to-head?
See all side-by-side comparisons between vitamin d products.
How does AIScored compare vitamin d?
We collect currently available review and product data from public sources to build a complete comparison baseline.
We read every review, check ingredient labels, fillers, and certifications, then generate an unbiased summary.
Products are scored 0-100 across evidence-based categories, making it easy to compare at a glance.
Which vitamin d buying guides are available?
Long-tail guides for specific goals in vitamin d.
What should you look for when buying vitamin d?
Choosing the right vitamin d can be overwhelming with hundreds of options on the UK market. Here are the key factors we analyse when scoring each product:
Bioavailability & Forms
Not all ingredient forms are equally effective. We check which forms are used and whether they're backed by research for optimal absorption and bioavailability.
Clean Label & Fillers
Many products contain unnecessary fillers, artificial colours, added sugars, and bulking agents. We flag products with excessive additives and reward clean formulations.
Third-Party Testing
Independent lab testing verifies that what's on the label is actually in the product. Products with third-party certifications (NSF, USP, Informed Sport) score higher in our rankings.
Value per Serving
The cheapest option isn't always the best value. We calculate the cost per serving and weigh it against ingredient quality, dosage, and overall effectiveness reported by users.
How Our Scoring Works
Each product is scored 0-100 across evidence-based categories. An overall score of 80+ indicates a product we'd recommend to most people. Scores of 60-79 are solid choices with some trade-offs, while anything below 60 has significant drawbacks reported by users. Our scores are recalculated regularly as new reviews and ingredient data come in.
Frequently Asked Questions
Where do you get your reviews?
We aggregate publicly available review and product data from retailer pages, communities, and specialist sources. We do not use manufacturer-provided testimonials as evidence.
How often are scores updated?
We re-analyse reviews and update scores regularly. Product pages show the date of the latest analysis.
Do you receive products for free?
No. AIScored does not accept free products or sponsored placements. Our revenue comes from affiliate links, which do not influence our scores.
What is the best vitamin d in 2026?
Based on our analysis of 35 products, the top rated vitamin d is Solgar Vitamin D3 1000 IU (25mcg) Softgels - 250 Count with a score of 83.0/100.
How many vitamin d products have you reviewed?
We have analysed 35 vitamin d products, scoring each on effectiveness, ingredient quality, value for money, side effects, and certifications.
What other categories are related to vitamin d?
Disclaimer: AIScored provides research-backed summaries based on publicly available reviews and product information. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Prices are updated regularly but may differ at the time of purchase. Affiliate links may earn us a commission at no extra cost to you.