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
by Nutravita
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Nutravita Vitamin D3 4000 IU is a high-strength cholecalciferol supplement in a clean softgel format, manufactured in the UK to GMP and BRC standards with German-sourced D3 in a sunflower oil carrier. Best for UK residents with limited sun exposure during autumn and winter and People diagnosed with or at risk of vitamin D deficiency.
According to the AIScored 0–100 scoring system, 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 by Nutravita scores 80.0/100, ranking #10 out of 35 products in Vitamin D (2026). Strongest category: Value For Money (90.0/100). Weakest: Certifications (62.0/100).
What Do Reviewers Say About 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?
Sample excerpts from currently available source material used in this product analysis.
"From what I can tell one of the higher doses per pill, so no need to swallow multiple to get the advertised dosage (unlike some others…). The pills are definitely on the smaller size. Lots in the bottle so I would recommend this one for sur..."
"Great product that I have used before. They are small, easy to swallow and don’t have an offensive smell. Helps to enhance my bone health, skin and my mood. Will continue to buy as needed. Recommended."
"Great strength per serving. The soft gel capsules are tiny and easy to swallow. The supplemental benefits are great for my energy levels and help with my sleep schedule."
"Envoi très rapide et réception sécurisée via un "Amazon Hub Locker" proche de chez moi. Je ne peux parler de l'efficacité du produit évidemment car ce n'est pas quantifiable. En tout cas la flacon est pratique et la gélule facile à avaler s..."
"Great product .. at last tablets that don't choke me!! previous tablets from superstore were the size of a cherry tomato, no wonder I avoided .. and if I did take I said a little prayer beforehand!!! lol these however R very easy to swallow..."
How does Nutravita Vitamin D3 4000 iu - 400 Hi... score?
Detailed score breakdown and key findings from our analysis of 17 reviews across 1 source.
Pros
- +Small, easy-to-swallow softgels praised by virtually every reviewer, including those with tablet-swallowing difficulties
- +Excellent value for money — 400 softgels lasts over a year at one-per-day dosing
- +Clean formula with no fillers, bulking agents, or anti-caking agents — just D3, sunflower oil, and gelatin
- +High 4000 IU dose meets medically recommended therapeutic levels for deficiency without needing multiple capsules
- +UK-manufactured under GMP and BRC certification with batch testing
Cons
- -Gelatin (bovine) capsule — not suitable for vegetarians or vegans
- -No independent third-party certification (no USP, NSF, or equivalent)
- -4000 IU exceeds general population guidelines; those without confirmed deficiency should consult a doctor before use
- -Not recommended for under-18s per product labelling, limiting household sharing
Best For
Watch Out
- !4000 IU is at the upper safe limit for daily supplementation — medical advice recommended for long-term use without confirmed deficiency
- !Not suitable for vegetarians or vegans due to bovine gelatin capsule
- !No independent third-party testing to verify label claims
- !Not recommended for children or teenagers under 18
What is 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 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 is a vitamin d product by Nutravita in softgel form, scoring 80.0/100 on AIScored.
- • ✔ WHY IS NUTRAVITA VITAMIN D3 4000 IU GREAT VALUE FOR MONEY? – Our Maximum Strength Full-Year Supply soft gel capsules with an extra month FREE are especially formulated to aid in normal maintenance of our bones, teeth, muscles and immune system even without the sun (claims substantiated by EFSA – European Food Safety Authority).
- • Taken only once a day, our Vitamin D3 4000 IU comes in small, easy-to-swallow soft gel capsules, not tablets and does not contain bulking or anti-caking agents.
- • ✔ HOW IMPORTANT IS VITAMIN D? – Getting enough Vitamin D is essential for our health as scientific studies indicate that it plays an important role in the process of cell division, in normal absorption of calcium and phosphorus, and in maintaining normal blood calcium levels for healthy bones and teeth (claims are backed up by EFSA).
- • The Vitamin D ingredient in our supplement is sourced from Germany.
- • ✔ WHY DO WE NEED TO TAKE VITAMIN D SUPPLEMENTS? – Vitamin D is produced naturally by the body in response to sunlight and found in certain dietary sources such as oily fish, mushrooms and eggs.
- • However, since it can be difficult to meet the required daily allowance from sunlight and food alone, taking supplements can help maintain satisfactory Vitamin D levels throughout the year.
- • ✔︎ QUALITY TESTED - Unlike many supplements, we haven't spared any expense on quality.
- • Each ingredient is quality tested before the manufacturing process begins, every batch of our supplement undergoes further rigorous quality testing.
- • We have done our best to provide as much information as possible, but if you do have any questions please reach out to our very helpful customer care team.
- • They will be happy to provide personalised assistance to help this supplement fit into your lifestyle.
- • ✔ WHAT IS THE STORY BEHIND NUTRAVITA? - Nutravita is a recognised and trusted Vitamins & Supplements brand providing thousands of customers across the world since 2014.
- • Our high quality products are manufactured, batch tested and certified in the UK, and safeguarded by the highest manufacturing standards in the world (GMP, BRC).
- • We have a dedicated team of pharmacologists, chemists and research scientists working to source the finest and most beneficial ingredients.
Is 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 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
- Softgel
- Dose
- 116 Grams
- Servings
- 400.0 count
- Vegan
- No
Frequently Asked Questions
Is 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 worth buying in 2026? ▼
What is the best price for 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 in the UK? ▼
What are the pros and cons of 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? ▼
Is 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 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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