Vitamin D-3, High Potency, 5,000 IU, 240 Softgels
by NOW Foods
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5,000 IU of cholecalciferol delivered in an extra virgin olive oil base — the fat-soluble carrier is correct science, not a gimmick. Best for People with confirmed vitamin D deficiency via blood test, especially those prescribed 5,000 IU by a doctor and Those in northern climates or low-sunlight regions needing reliable year-round supplementation.
According to the AIScored 0–100 scoring system, Vitamin D-3, High Potency, 5,000 IU, 240 Softgels by NOW Foods scores 82.0/100, ranking #5 out of 35 products in Vitamin D (2026). Strongest category: Value For Money (91.0/100). Weakest: Certifications (52.0/100).
Is Vitamin D-3, High Potency, 5,000... worth buying?
“NOW Foods Vitamin D-3 5,000 IU scores 85 because it actually works—users report measurable improvements in blood levels when they get tested, which is the real test of whether a supplement is doing anything. With 240 softgels, you're looking at eight months of daily supplementation for one of the lowest per-dose costs you'll find on the UK market.”
What Do Reviewers Say About Vitamin D-3, High Potency, 5,000 IU, 240 Softgels?
Sample excerpts from currently available source material used in this product analysis.
"The best vitamin D!!!. I take vitamin D from NOW and I am very satisfied. I noticed that I have more energy and my skin looks better. The capsules are small, it is convenient to drink. The quality is good, without unnecessary impurities. I..."
"Stunning. I had problems with my vitamin D, and my doctor prescribed a fairly high dosage of 5000 IU per day. I chose this brand. The plastic packaging and the dosage were accurate. I could see the results within a month. My levels returned..."
"Great. NOW® Vitamin D3 Softgels provide this essential vitamin in an easily absorbed liquid form. Vitamin D is usually obtained from food or produced by the skin when exposed to the sun's ultraviolet rays. However, it is not found in suffic..."
"Nau is always quality and health. Convenient size of pills, the dosage of the drug was prescribed by the doctor, since there was a deficiency in the analysis for vitamin D. A large package, which is enough for 4 months, since I rarely see t..."
"The product arrived intact, well packaged, and within the expiration date. I'm using it as directed and haven't noticed any noticeable effects yet, but I haven't had any negative reactions either. I'll use it until the end of the package an..."
How does Vitamin D-3, High Potency, 5,000 IU, ... score?
Detailed score breakdown and key findings from our analysis of 50 reviews across 1 source.
Pros
- +Cholecalciferol (D3) in olive oil — correct form and fat-soluble delivery for meaningful absorption
- +240 softgels at 5,000 IU is exceptional value; multiple reviewers explicitly note how long a single purchase lasts
- +Tiny, tasteless, odourless softgels — easy to swallow, praised consistently across dozens of reviews
- +Several reviewers confirm blood levels normalised after taking this at a doctor-recommended 5,000 IU dose
- +Clean label: BSE-free bovine gelatin, no soy, gluten, or GMO ingredients
Cons
- -Not vegan — bovine gelatin capsule shell rules it out for plant-based users
- -No independent third-party purity or potency testing (no NSF, USP, or equivalent verification)
- -5,000 IU is a therapeutic dose, not a maintenance dose — appropriate only with confirmed deficiency and blood monitoring
- -No K2 included; several reviewers specifically flag that K2 should be taken separately to direct calcium properly
Best For
Watch Out
- !Daily 5,000 IU without monitoring risks hypercalcaemia over time — test 25(OH)D levels periodically
- !Contraindicated or requires physician oversight with thiazide diuretics, topical psoriasis medications, kidney disease, or hyperparathyroidism
- !Contains gelatin — not suitable for vegans, vegetarians, or those requiring a non-animal capsule
What is Vitamin D-3, High Potency, 5,000 IU, 240 Softgels?
Vitamin D-3, High Potency, 5,000 IU, 240 Softgels is a vitamin d product by NOW Foods, scoring 82.0/100 on AIScored.
- • Product overview Description Larger Count Bone & Immune Health Supports Healthy Teeth Promotes Muscle Health Non-GMO A Dietary Supplement Kosher - Contains Gelatine Family Owned Since 1968 Vitamins Halal GMP Quality Assured NOW® Vitamin D-3 softgels supply this key vitamin in a highly-absorbable liquid softgel form.
- • Vitamin D is normally obtained from the diet or produced by the skin from the ultraviolet energy of the sun.
- • However, it is not abundant in food.
- • As more people avoid sun exposure, Vitamin D supplementation becomes even more necessary to ensure that your body receives an adequate supply.
- • Suggested use Take 1 softgel daily with a fat-containing meal, or as directed by your healthcare professional.
- • Other ingredients Extra virgin olive oil, softgel capsule [bovine gelatine (BSE-free), glycerine, water] and safflower oil.
- • Not manufactured with yeast, wheat, gluten, soya, corn, milk, egg, fish, shellfish or sesame ingredients.
- • Produced in a GMP facility that processes other ingredients containing these allergens.
- • Warnings For adults only.
- • Do not exceed the recommended dose.
- • Consult a physician if pregnant/nursing, taking medication (especially topical psoriasis medications or thiazide diuretics), or have a medical condition (especially hypercalcaemia, kidney disease, or hyperparathyroidism).
- • Keep out of reach of children.
- • Natural colour variation may occur in this product.
- • Store in a cool, dry place after opening.
- • Disclaimer While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site.
- • Although items may occasionally be despatched with alternative packaging, freshness is always guaranteed.
- • We recommend that you read labels, warnings and directions of all products before use and do not rely solely on the information provided by iHerb.
- • This website has been machine translated as a courtesy to customers.
- • iHerb does not represent or warrant that the t.
Is Vitamin D-3, High Potency, 5,000 IU, 240 Softgels 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
- Vegan
- No
Frequently Asked Questions
Is Vitamin D-3, High Potency, 5,000 IU, 240 Softgels worth buying in 2026? ▼
What is the best price for Vitamin D-3, High Potency, 5,000 IU, 240 Softgels in the UK? ▼
What are the pros and cons of Vitamin D-3, High Potency, 5,000 IU, 240 Softgels? ▼
Is Vitamin D-3, High Potency, 5,000 IU, 240 Softgels 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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