Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml vs Vitamin D-3, High Potency, 5,000 IU, 240 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, 240 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, 240 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, 240 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 volume — 240 softgels at £11.93 versus £19.95 for 30ml, with a higher effectiveness score (88 vs 75). Choose Nutri Advanced if you need liquid drops, struggle swallowing capsules, or want the added MK-7 K2 for bone and cardiovascular support.

— 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	85.0/100 Best
Ingredient Quality	93.0/100 Best	83.0/100
Value for Money	84.0/100	91.0/100 Best
Side Effects	91.0/100 Best	87.0/100
Certifications	88.0/100 Best	52.0/100
Best Price	£19.95 Amazon UK →	£11.93 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

View full review →

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

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

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

People with confirmed vitamin D deficiency via blood test, especially those prescribed 5,000 IU by a doctor Those in northern climates or low-sunlight regions needing reliable year-round supplementation Budget-conscious buyers wanting a clean, high-potency D3 without inflated branding costs

iHerb £11.93

View full review →

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

These two supplements take fundamentally different approaches to vitamin D. NOW Foods offers a single-nutrient 5,000 IU softgel at £11.93 for 240 capsules — a straightforwardly high-dose option that reviewers consistently credit with normalising blood levels. Nutri Advanced's liquid drops cost £19.95 for 30ml and deliver a far lower 1,000 IU D3 per three drops, but pair it with 45mcg of K2 as MK-7 — the form with the strongest clinical evidence for bone mineralisation and cardiovascular protection. The formulation is impressively clean: just MCT oil, vitamin E, and natural orange flavour.

If your goal is correcting a confirmed deficiency quickly and cheaply, NOW Foods scores 93/100 for value and delivers a therapeutic dose without complication. At roughly 5p per softgel, it's hard to argue with for most adults. The Nutri Advanced drops suit people who can't swallow capsules, want the D3+K2 combination, or need to fine-tune their dose — though at 1,000 IU baseline, deficient individuals will likely be using several servings daily, which pushes the per-dose cost up considerably.

Practically speaking, neither is vegan — NOW uses bovine gelatin, Nutri Advanced sources D3 from lanolin. The liquid drops require careful storage after opening. Nutri Advanced is third-party tested; NOW Foods is not, which matters if you're particular about label accuracy at therapeutic doses.

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..

85.0/100

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..

91.0/100

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..

52.0/100

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: People with confirmed vitamin D deficiency via blood test, especially those prescribed 5,000 IU by a doctor, Those in northern climates or low-sunlight regions needing reliable year-round supplementation

Frequently Asked Questions

Which is better, Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml or Vitamin D-3, High Potency, 5,000 IU, 240 Softgels? ▼

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 83.0/100 overall while Vitamin D-3, High Potency, 5,000 IU, 240 Softgels scores 82.0/100. Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml comes out ahead, scoring higher on effectiveness (75.0 vs 85.0). 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 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.

Is Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml worth the price compared to Vitamin D-3, High Potency, 5,000 IU, 240 Softgels? ▼

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml costs £19.95 while Vitamin D-3, High Potency, 5,000 IU, 240 Softgels is £11.93. For value, Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 84.0/100 vs Vitamin D-3, High Potency, 5,000 IU, 240 Softgels's 91.0/100. Vitamin D-3, High Potency, 5,000 IU, 240 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, 240 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 52.0/100. Always consult a healthcare professional before starting any supplement.