Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml vs Vitamin D-3, High Potency, 5,000 IU, 120 Softgels

Q: Why do 97% of UK vitamin D supplements lack third-party certification?

Of 35 vitamin D products in our database, only 1 carries third-party certification. That means 97% of the vitamin D supplements sold in the UK have no independent verification of what's actually in the bottle. UK regulations don't require third-party testing for supplements, so most brands skip it to save money. If certification matters to you, NOW Foods and Thorne are the brands scoring highest in our rankings, with overall scores of 85-87/100.

Q: Do you need vitamin K2 with high-dose vitamin D?

Our data shows that Thorne Vitamin D + K2 Liquid is the only combination D3+K2 product scoring 87/100 in our database of 35 vitamin D supplements, tying with two NOW Foods D3-only products for the top spot. Clinical research suggests K2 helps direct calcium to bones rather than arteries, which may matter at doses above 4000 IU daily. If you already eat K2-rich foods like natto, hard cheese, or egg yolks, a standalone D3 product may be sufficient.

Side-by-side comparison of scores, ingredients, prices and real customer feedback for Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml and Vitamin D-3, High Potency, 5,000 IU, 120 Softgels.

Last verified: 07 Apr 2026 · Based on 78 reviews

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83.0

Quick Answer

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 83.0/100 vs Vitamin D-3, High Potency, 5,000 IU, 120 Softgels at 82.0/100. Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml wins on ingredient quality, side effects, certifications. Vitamin D-3, High Potency, 5,000 IU, 120 Softgels is stronger on effectiveness and value for money.

Which is better: Nutri Advanced Vitamin D3 w... or Vitamin D-3, High Potency, ...?

NOW Foods wins on value and overall score (85 vs 83, at £6.74 vs £19.95) — its oil-based softgel delivers an effective 5,000 IU dose for confirmed deficiency at a fraction of the cost. Choose Nutri Advanced if you need flexible liquid dosing, struggle with capsules, or want the added bone and cardiovascular benefit of MK-7 K2 alongside D3.

— AIScored Editorial Team

How Do the Scores Compare?

Nutri Advanced Vitamin D3 w...

Vitamin D-3, High Potency, ...

	Nutri Advanced Vitamin D3 w... Nutri Advanced	Vitamin D-3, High Potency, ... NOW Foods
Overall Score	83.0	82.0
Effectiveness	75.0/100	86.0/100 Best
Ingredient Quality	93.0/100 Best	83.0/100
Value for Money	84.0/100	90.0/100 Best
Side Effects	91.0/100 Best	87.0/100
Certifications	88.0/100 Best	58.0/100
Best Price	£19.95 Amazon UK →	£6.74 iHerb → Cheapest
Price per Serving	£0.06 330 servings	N/A
Form	Liquid Drops	None
Dose	1000 IU D3 + 45mcg K2 MK-7 per 3 drops	None
Third-Party Tested	✓ Yes	✗ No
Reviews Analysed	28	50

Nutri Advanced Vitamin D3 with K...

Pros

✓Exemplary clean formulation: MCT oil carrier, natural orange flavour, and vitamin E stabiliser only — no fillers, bulking agents, or artificial additives
✓MK-7 form of K2 (longest half-life, best clinical evidence) paired with D3 for synergistic bone mineralisation and cardiovascular protection
✓Liquid drops allow precise, flexible dose adjustment — practical for those with confirmed deficiency needing higher therapeutic amounts
✓330 servings per bottle provides outstanding cost-per-serving for a practitioner-grade, third-party tested product

Cons

✗1000 IU D3 per 3-drop serving is a low baseline dose — those with confirmed deficiency will need multiple servings daily and should monitor blood levels
✗Not vegan: D3 is lanolin-derived from sheep's wool; liquid format may also require careful storage after opening
✗Contains coconut-derived MCT oil, which may be a concern for individuals with coconut sensitivity
✗Premium practitioner positioning means it is pricier per bottle than mainstream pharmacy alternatives despite similar active ingredients

Best For

People who struggle swallowing capsules or tablets Individuals with confirmed vitamin D deficiency needing flexible therapeutic dosing Those seeking combined D3+K2 support for bone density and cardiovascular health Healthcare practitioners recommending clean-label supplements to patients Adults over 50 at higher risk of D3 deficiency and bone loss

Amazon UK £19.95

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Vitamin D-3, High Potency, 5,000...

Pros

✓D3 (cholecalciferol) in an olive oil and safflower oil base — the most bioavailable form, in the most appropriate delivery medium for a fat-soluble vitamin
✓Multiple reviewers confirmed blood test levels returning to normal after consistent use, including doctor-prescribed cases of significant deficiency
✓Small softgels praised consistently as easy to swallow, tasteless, and gentle on the stomach
✓5,000 IU therapeutic dose in a single capsule — practical for deficiency correction without splitting doses

Cons

✗Not third-party tested — no independent lab has verified potency or purity; specs confirm this
✗Not vegan or vegetarian: bovine gelatin capsule
✗5,000 IU exceeds standard maintenance levels and is not appropriate for unsupervised long-term use without periodic blood monitoring
✗Does not include K2, which several reviewers note is needed for proper calcium routing — requires a separate purchase

Best For

Adults with confirmed vitamin D deficiency, especially those prescribed 5,000 IU by a doctor People in low-sunlight climates or spending most of the year indoors Budget-conscious buyers wanting a clean single-ingredient D3 without unnecessary additives Those who already take a separate K2 supplement and want a standalone high-dose D3

iHerb £6.74

View full review →

What does the data say about Nutri Advanced Vitamin... vs Vitamin D-3, High Pote...?

The biggest practical gap between these two products is dose. NOW Foods Vitamin D-3 5,000 IU delivers exactly that — 5,000 IU of cholecalciferol per softgel, in an olive oil and safflower oil base that suits a fat-soluble vitamin well. Nutri Advanced's liquid drops give you 1,000 IU of D3 plus 45mcg of K2 MK-7 per three drops. That K2 addition matters: MK-7 is the form with the longest half-life and the strongest clinical evidence, paired here with D3 for bone mineralisation and cardiovascular support. The ingredient quality score reflects this — Nutri Advanced scores 93/100 versus NOW's 83/100. But on effectiveness, NOW wins clearly at 86/100 against 75/100, most likely because confirmed deficiency cases getting a full 5,000 IU in one go saw measurable blood test improvements.

The choice really comes down to what you need corrected. If you've been prescribed 5,000 IU, or you're in a low-sunlight climate and want a straightforward, budget-friendly fix, NOW Foods at £6.74 for 120 softgels is the obvious pick — it scores 90/100 for value. Nutri Advanced at £19.95 for 30ml makes more sense if you want D3 and K2 together, or if you can't swallow capsules. The liquid drops let you adjust dose precisely, which is useful when working up to a therapeutic amount.

On practicalities: NOW's softgels are small and tasteless, though the bovine gelatin capsule rules them out for vegetarians. Nutri Advanced uses a natural orange flavour with MCT oil — no fillers or bulking agents — but its D3 is lanolin-derived from sheep's wool, so neither product suits vegans. Nutri Advanced is also third-party tested, which NOW is not, giving it an edge if verified potency matters to you.

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml Winner 83.0/100

Nutri Advanced Vitamin D3 with K2 Liquid Drops is a practitioner-grade UK supplement combining cholecalciferol (D3) and menaquinone-7 (the preferred long-acting form of K2) in an MCT oil base — one of the cleanest supplement formulations on the UK market.

Effectiveness

Nutri Advanced V..

75.0/100

Vitamin D-3, Hig..

86.0/100

Ingredient Quality

Nutri Advanced V..

93.0/100

Vitamin D-3, Hig..

83.0/100

Value for Money

Nutri Advanced V..

84.0/100

Vitamin D-3, Hig..

90.0/100

Side Effects

Nutri Advanced V..

91.0/100

Vitamin D-3, Hig..

87.0/100

Certifications

Nutri Advanced V..

88.0/100

Vitamin D-3, Hig..

58.0/100

What are the key differences?

Nutri Advanced Vitamin .. is best for: People who struggle swallowing capsules or tablets, Individuals with confirmed vitamin D deficiency needing flexible therapeutic dosing

Vitamin D-3, High Poten.. is best for: Adults with confirmed vitamin D deficiency, especially those prescribed 5,000 IU by a doctor, People in low-sunlight climates or spending most of the year indoors

Frequently Asked Questions

Which is better, Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml or Vitamin D-3, High Potency, 5,000 IU, 120 Softgels? ▼

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 83.0/100 overall while Vitamin D-3, High Potency, 5,000 IU, 120 Softgels scores 82.0/100. Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml comes out ahead, scoring higher on effectiveness (75.0 vs 86.0). Nutri Advanced Vitamin D3 with is best suited for People who struggle swallowing capsules or tablets and Individuals with confirmed vitamin D deficiency needing flexible therapeutic dosing. Vitamin D-3, High Potency, 5,0 is better for Adults with confirmed vitamin D deficiency, especially those prescribed 5,000 IU by a doctor and People in low-sunlight climates or spending most of the year indoors.

Is Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml worth the price compared to Vitamin D-3, High Potency, 5,000 IU, 120 Softgels? ▼

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml costs £19.95 while Vitamin D-3, High Potency, 5,000 IU, 120 Softgels is £6.74. For value, Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 84.0/100 vs Vitamin D-3, High Potency, 5,000 IU, 120 Softgels's 90.0/100. Vitamin D-3, High Potency, 5,000 IU, 120 Softgels delivers better value relative to its quality.

Which has fewer side effects? ▼

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 91.0/100 for side effects (higher means fewer reported issues) while Vitamin D-3, High Potency, 5,000 IU, 120 Softgels scores 87.0/100. Reviewers report fewer side effects with Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml. For certification and testing, Nutri Advanced Vitam scores 88.0/100 vs Vitamin D-3, High Po's 58.0/100. Always consult a healthcare professional before starting any supplement.