Vitamin D3 1000IU - 90 Caps
by Viridian
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Viridian Vitamin D3 1000IU is a lichen-sourced, plant-based D3 supplement manufactured in the UK with a notably clean formulation — no fillers, binders, or artificial additives. Best for People seeking a clean-label D3 with no additives or fillers and Those on plant-based or allergy-sensitive diets (if capsule shell confirmed vegan).
According to the AIScored 0–100 scoring system, Vitamin D3 1000IU - 90 Caps by Viridian scores 75.0/100, ranking #26 out of 35 products in Vitamin D (2026). Strongest category: Side Effects (91.0/100). Weakest: Certifications (62.0/100).
Is Vitamin D3 1000IU - 90 Caps worth buying?
“Viridian's Vitamin D3 is one of the few truly plant-based D3 supplements—sourced from lichen rather than the lanolin-derived alternatives most brands use—making it a genuinely ethical choice for vegans. With a score of 75/100, you get a clean formulation with no fillers, binders, or artificial additives, all made to Viridian's meticulous UK manufacturing standards.”
What Do Reviewers Say About Vitamin D3 1000IU - 90 Caps?
Sample excerpts from currently available source material used in this product analysis.
"This item is very good for everyones health, great for all the family and very price."
"I have been taking these for a while now and won’t take anything else. Super value for a quality product which I take all year round."
"It's a shame these are not stronger, as I would prefer 5000iu. Saying that, I did notice a difference, especially to the strength and length of my fingernails, although I did take two to four capsules a day; of course, this meant that I ran..."
How does Vitamin D3 1000IU - 90 Caps score?
Detailed score breakdown and key findings from our analysis of 8 reviews across 1 source.
Pros
- +Exceptionally clean formulation with no fillers, E numbers, or artificial additives — highlighted by multiple reviewers
- +Lichen-sourced D3 (cholecalciferol) — a bioavailable vegan-friendly form, rarer and more ethical than lanolin-derived alternatives
- +UK-manufactured with 130 in-house quality checks; Viridian is a trusted independent brand in the health store sector
- +Easy to swallow capsules with no reported tolerability issues
- +Consistently good value for money for a premium clean-label product
Cons
- -1000IU is a low-to-moderate dose — one reviewer found they needed 2–4 capsules daily for noticeable effect, burning through the supply quickly
- -No third-party testing (e.g. Informed Sport, NSF) — relies on in-house quality assurance only
- -Product specs flag non-vegan despite description claiming lichen-sourced vegan D3 — capsule shell may be gelatin-based, worth verifying for strict vegans
- -Most reviews are generic (delivery praise, brief endorsements) with limited detail on actual health outcomes
Best For
Watch Out
- !1000IU may be insufficient for those with confirmed vitamin D deficiency — higher doses (2000–4000IU) are often recommended clinically
- !Discrepancy between 'vegan' claim in description and non-vegan flag in specs — likely a gelatin capsule shell; strict vegans should verify
- !No independent third-party certification despite strong in-house standards
- !Taking multiple capsules daily to compensate for low dose significantly increases cost-per-dose
What is Vitamin D3 1000IU - 90 Caps?
Vitamin D3 1000IU - 90 Caps is a vitamin d product by Viridian in capsule form, scoring 75.0/100 on AIScored.
- • BONES, TEETH & IMMUNITY: Viridian Vitamin D3 1000iu contributes to the maintenance of normal bones, teeth, muscle function and immune health, making it an essential daily supplement for overall wellness, especially during darker winter months.
- • HIGHLY ABSORBABLE FORM: Sourced from lichen, a unique plant-based source, this vegan-friendly D3 is a potent and bioavailable alternative to traditional lanolin-derived vitamin D, making it suitable for those following a plant-based lifestyle.
- • IDEAL FOR WINTER MONTHS: Known as the "sunshine vitamin", vitamin D3 is naturally produced by the body in sunlight.
- • However, during the UK winter, sun exposure is limited, making supplementation essential to maintain healthy levels and overall well-being.
- • EXPERTLY FORMULATED: Containing 100% active ingredients with no fillers or artificial additives, our vitamin D3 1000iu supplement is formulated by expert nutritionists and manufactured in the UK to the highest standards of purity and efficacy.
- • COMPLETE SATISFACTION: Every Viridian supplement is fully considered from the seed to the recycling bank with 130 quality checks.
- • Our customer service team and qualified nutritionists are based in Northamptonshire and available to support you.
- • Our range is also stocked in independent health stores across the country.
Is Vitamin D3 1000IU - 90 Caps Independently Tested?
No Third-Party Testing Visible
We could not find evidence of independent third-party testing for this product. This doesn't mean it's unsafe, but independent verification provides additional assurance.
How We Score Supplements
Our methodology analyses review data, ingredient science, and product information, then scores each product on a 0-100 scale across evidence-based categories:
Effectiveness
How well the product delivers its claimed benefits, based on reviews and ingredient evidence.
Ingredient Quality
Bioavailable forms, clinically effective dosages, clean label, minimal fillers.
Value for Money
Price relative to ingredient quality, dosage count, and effectiveness.
Side Effects Profile
Higher score = fewer side effects. 100 means virtually no adverse reactions reported.
Certifications & Testing
Third-party lab testing, GMP certification, and independent quality verification.
Overall Score
Weighted combination of all factors. Our bottom-line recommendation.
Price History (90 days)
Quick Facts
- Form
- Capsule
- Vegan
- No
Frequently Asked Questions
Is Vitamin D3 1000IU - 90 Caps worth buying in 2026? ▼
What is the best price for Vitamin D3 1000IU - 90 Caps in the UK? ▼
What are the pros and cons of Vitamin D3 1000IU - 90 Caps? ▼
Is Vitamin D3 1000IU - 90 Caps third-party tested? ▼
What the Data Says About Vitamin D
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 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. Affiliate links may earn us a commission at no extra cost to you.
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