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Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml vs Vitamin D3 5000 IU

Side-by-side comparison of scores, ingredients, prices and real customer feedback for Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml and Vitamin D3 5000 IU.

Last verified: 07 Apr 2026 · Based on 38 reviews

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83.0
Quick Answer

Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 83.0/100 vs Vitamin D3 5000 IU at 81.0/100. Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml wins on ingredient quality, value for money, side effects. Vitamin D3 5000 IU is stronger on effectiveness.

Which is better: Nutri Advanced Vitamin D3 w... or Vitamin D3 5000 IU?

Nutri Advanced edges ahead at 83/100 versus Thorne's 81/100, with the added benefit of a clear £19.95 price and flexible dosing in a clean formula. Choose Thorne only if you need the higher 5000 IU dose and your doctor confirms deficiency.

— AIScored Editorial Team

How Do the Scores Compare?

Nutri Advanced Vitamin D3 w...
Vitamin D3 5000 IU
Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml
Nutri Advanced Vitamin D3 w...
Nutri Advanced
 Vitamin D3 5000 IU
Vitamin D3 5000 IU
Thorne
Overall Score 83.0 81.0
Effectiveness 75.0/100 82.0/100
Best
Ingredient Quality 93.0/100
Best
 90.0/100
Value for Money 84.0/100
Best
 66.0/100
Side Effects 91.0/100
Best
 80.0/100
Certifications 88.0/100
Best
 88.0/100
Best
Best Price £19.95 Amazon UK →
Cheapest
 View →
Price per Serving £0.06 330 servings N/A
Form Liquid Drops N/A
Dose 1000 IU D3 + 45mcg K2 MK-7 per 3 drops N/A
Third-Party Tested ✓ Yes ✗ No
Reviews Analysed 28 10

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 D3 5000 IU

Pros

  • ✓Thorne Research is NSF Certified for Sport — independently tested for purity and label accuracy
  • ✓Cholecalciferol (D3) is the most bioavailable and research-supported form of vitamin D
  • ✓D3+K2 MK7 combination helps direct calcium to bones rather than arteries — evidence-backed synergy
  • ✓Liquid format (30ml) allows flexible dosing and faster absorption than capsules

Cons

  • ✗5000 IU is a high therapeutic dose — not appropriate for general daily use without a confirmed deficiency test
  • ✗Premium price point compared to generic D3 supplements
  • ✗Liquid format requires careful dosing to avoid over-supplementation
  • ✗Fat-soluble vitamin — must be taken with a meal containing fat for optimal absorption

Best For

People with confirmed vitamin D deficiency Adults over 50 with reduced sun exposure Indoor workers or those in northern latitudes Athletes needing NSF-certified supplements Those on bone health protocols combining D3 and K2
Amazon UK View →
View full review →

What does the data say about Nutri Advanced Vitamin... vs Vitamin D3 5000 IU?

Nutri Advanced's liquid drops deliver 1000 IU of D3 with 45mcg of K2 MK-7 per 3-drop serving, while Thorne's Vitamin D3 offers a 5000 IU dose. The main difference is flexibility and formulation detail. Nutri Advanced uses only MCT oil, natural orange flavour, and vitamin E as stabilisers — nothing else. The D3+K2 pairing supports bone mineralisation and cardiovascular protection.

Pick Nutri Advanced at £19.95 if you want precise dose control and D3+K2 synergy for bone health. Its liquid format suits anyone struggling with capsules. However, 1000 IU per serving is a low starting dose — those with confirmed deficiency need multiple servings daily and should test blood levels. Choose Thorne's 5000 IU if you've confirmed deficiency and want a stronger single dose, though 5000 IU isn't appropriate for general daily use without testing first.

Practically, Nutri Advanced isn't vegan because D3 comes from sheep's wool, and liquid needs careful storage after opening. Thorne's price isn't listed, so direct cost comparison isn't possible. Nutri Advanced scores 83.0 overall, slightly ahead of Thorne's 81.0.

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 D3 5000 IU
82.0/100
Ingredient Quality
Nutri Advanced V..
93.0/100
Vitamin D3 5000 IU
90.0/100
Value for Money
Nutri Advanced V..
84.0/100
Vitamin D3 5000 IU
66.0/100
Side Effects
Nutri Advanced V..
91.0/100
Vitamin D3 5000 IU
80.0/100
Certifications
Nutri Advanced V..
88.0/100
Vitamin D3 5000 IU
88.0/100

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 D3 5000 IU is best for: People with confirmed vitamin D deficiency, Adults over 50 with reduced sun exposure

Frequently Asked Questions

Which is better, Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml or Vitamin D3 5000 IU? ▼
Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 83.0/100 overall while Vitamin D3 5000 IU scores 81.0/100. Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml comes out ahead, scoring higher on effectiveness (75.0 vs 82.0). 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 D3 5000 IU is better for People with confirmed vitamin D deficiency and Adults over 50 with reduced sun exposure.
Is Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml worth the price compared to Vitamin D3 5000 IU? ▼
For value, Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml scores 84.0/100 vs Vitamin D3 5000 IU's 66.0/100. Nutri Advanced Vitamin D3 with K2 Liquid Drops 30ml 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 D3 5000 IU scores 80.0/100. 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 D3 5000 IU's 88.0/100. Always consult a healthcare professional before starting any supplement.

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What the Data Says

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 data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.

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