Vitamin D3, High Potency, 10,000 IU, 120 Softgels
by NOW Foods
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10,000 IU of cholecalciferol in a softgel with extra virgin olive oil — a sensible delivery for a fat-soluble vitamin. Best 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.
According to the AIScored 0–100 scoring system, Vitamin D3, High Potency, 10,000 IU, 120 Softgels by NOW Foods scores 82.0/100, ranking #6 out of 35 products in Vitamin D (2026). Strongest category: Value For Money (89.0/100). Weakest: Certifications (52.0/100).
Is Vitamin D3, High Potency, 10,000... worth buying?
“NOW Foods' 10,000 IU Vitamin D3 shifts deficiency quickly — multiple reviewers have confirmed improvements with blood test results. With an 81/100 score, 120 softgels lasting up to a year, and efficient absorption from the olive oil base, it's genuine value if you need proper vitamin D supplementation.”
What Do Reviewers Say About Vitamin D3, High Potency, 10,000 IU, 120 Softgels?
Sample excerpts from currently available source material used in this product analysis.
"natural sun. Supports bone and dental health: Vitamin D3 promotes the absorption of calcium and phosphorus, which is important for maintaining strong bones and teeth. Strengthens the immune system: Vitamin D3 plays a role in modulating the..."
"The Best Vitamin D3. Vitamin D3 is responsible for balancing calcium and phosphorus levels in the blood, maintaining bone health. It also has immunomodulatory and neuromuscular effects, helping to strengthen the immune system and improve st..."
"Bone strengthener. This vitamin D supplement features high-quality ingredients and is carefully formulated to provide the right amount to meet the body's daily needs. Each dose is carefully considered to boost immunity and support overall h..."
"excellent d3. A very good D3 for adults; it raises test levels. The quality of this brand is superior to D3, as it affects immunity and helps with calcium and phosphorus absorption, mineralizing bone tissue. The capsules are small, very eas..."
"Vitamin D3 is very useful and essential. I take it in a 10,000mg dose, in courses. The price and quality are on par with the most expensive ones. The capsules are small and easy to swallow. You only need one a day, preferably in the morning..."
How does Vitamin D3, High Potency, 10,000 IU, ... score?
Detailed score breakdown and key findings from our analysis of 50 reviews across 1 source.
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
- +Excellent value per dose — 120 capsules taken every 2–3 days lasts well over six months
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
Watch Out
- !10,000 IU daily without blood monitoring risks hypervitaminosis D — get tested before and during use
- !Not suitable for people with hypercalcaemia, kidney disease, or hyperparathyroidism (explicitly listed on the label)
- !Several reviewers recommend pairing with K2 (MK-7) at this dose level — not included in this product
- !Contraindicated with thiazide diuretics and topical psoriasis treatments per the label
What is Vitamin D3, High Potency, 10,000 IU, 120 Softgels?
Vitamin D3, High Potency, 10,000 IU, 120 Softgels is a vitamin d product by NOW Foods, scoring 82.0/100 on AIScored.
- • Product overview Description Bone & Immune Health Supports Healthy Teeth Promotes Muscle Health Non-GMO A Dietary Supplement Kosher - Contains Gelatine Halal Vitamins Family Owned Since 1968 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 every 3 days with a fat-containing meal, or as directed by your healthcare practitioner.
- • Other ingredients Extra virgin olive oil, softgel capsule bovine gelatin (BSE-free), glycerin, water and safflower oil.
- • Packaged and quality tested in the UK.
- • Not manufactured with yeast, wheat, gluten, soy, 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 doctor if pregnant/breastfeeding, taking medication (especially topical psoriasis treatments 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 r.
Is Vitamin D3, High Potency, 10,000 IU, 120 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 D3, High Potency, 10,000 IU, 120 Softgels worth buying in 2026? ▼
What is the best price for Vitamin D3, High Potency, 10,000 IU, 120 Softgels in the UK? ▼
What are the pros and cons of Vitamin D3, High Potency, 10,000 IU, 120 Softgels? ▼
Is Vitamin D3, High Potency, 10,000 IU, 120 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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