NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules vs Vitamins D and K with Sea-Iodine, 60 Capsules

Side-by-side comparison of scores, ingredients, prices and real customer feedback for NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules and Vitamins D and K with Sea-Iodine, 60 Capsules.

Last verified: 07 Apr 2026 · Based on 116 reviews

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85.0

Quick Answer

NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules scores 85.0/100 vs Vitamins D and K with Sea-Iodine, 60 Capsules at 73.0/100. NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules wins on effectiveness, ingredient quality, value for money.

Which is better: NOW Foods MK-7 Vitamin K-2 ... or Vitamins D and K with Sea-I...?

NOW Foods MK-7 wins with a cleaner, more focused formulation and a higher overall score (85 vs 79), making it the safer daily choice for most adults. Life Extension suits those who specifically need high-dose D3 (5,000 IU) alongside iodine support, but its 1,000 mcg iodine content warrants caution without medical guidance.

— AIScored Editorial Team

How Do the Scores Compare?

NOW Foods MK-7 Vitamin K-2 ...

Vitamins D and K with Sea-I...

	NOW Foods MK-7 Vitamin K-2 ... NOW Foods	Vitamins D and K with Sea-I... Life Extension
Overall Score	85.0	73.0
Effectiveness	83.0/100 Best	77.0/100
Ingredient Quality	90.0/100 Best	82.0/100
Value for Money	79.0/100 Best	68.0/100
Side Effects	91.0/100 Best	80.0/100
Certifications	93.0/100 Best	38.0/100
Best Price	£21.99 Amazon UK →	£14.36 iHerb → Cheapest
Price per Serving	£0.37 60 servings	N/A
Form	Capsules	None
Dose	100mcg Vitamin K2 (MK-7)	None
Third-Party Tested	✓ Yes	✗ No
Reviews Analysed	66	50

NOW Foods MK-7 Vitamin K-2 100mc...

Pros

✓Uses branded MenaQ7® MK-7 form — the most bioavailable, longest-acting K2 variant with solid clinical backing
✓Exceptionally clean formulation: rice flour, ascorbyl palmitate (natural antioxidant), silicon dioxide — no unnecessary fillers
✓Vegan vegetable capsules; certified Non-GMO, Soy-Free, Kosher, GMP — broad allergen-free profile
✓100 mcg dose is the evidence-supported daily maintenance amount for D3 pairing and bone/vascular calcium regulation

Cons

✗60-capsule bottles last only 2 months at daily dosing — not a high-count economy size
✗Benefits (bone density, cardiovascular calcium regulation) are gradual and may not produce noticeable short-term effects
✗People on blood-thinning medications (e.g., warfarin) must consult a doctor — K2 directly affects coagulation pathways
✗A minority of Trustpilot reviewers raised concerns about Amazon third-party seller packaging integrity — buy from authorised retailers

Best For

Adults supplementing vitamin D3 at any dose People taking calcium supplements seeking proper bone deposition Vegans and vegetarians needing a plant-based K2 source Over-40s focused on bone density and arterial health Those with soy, gluten, or dairy sensitivities Anyone wanting a single-ingredient, no-fuss K2 capsule

Amazon UK £21.99

View full review →

Vitamins D and K with Sea-Iodine...

Pros

✓D3 at 5,000 IU is a meaningful therapeutic dose for deficiency — multiple reviewers specifically bought it to address low vitamin D
✓MK-7 form of K2 is the right choice for calcium regulation; reviewers with endocrinologist guidance specifically chose this product
✓Marine-sourced iodine for thyroid support, noted by several reviewers as preferable to synthetic potassium iodide
✓Capsules consistently praised as small and easy to swallow — no discomfort reported

Cons

✗1,000 mcg iodine is at the tolerable upper limit; one reviewer explicitly warns this dose is not suitable for continuous daily use without monitoring
✗No third-party testing confirmed — Life Extension has a strong reputation, but no independent verification of label accuracy or contamination testing
✗Noticeably more expensive than standalone D3 products — one reviewer specifically compared it unfavourably to basic Thorne D3 drops on price
✗Not vegan, which limits suitability for plant-based users

Best For

People with confirmed vitamin D deficiency who also want calcium-routing K2 support in one capsule Those with low sun exposure — referenced by multiple reviewers as the core reason for purchase Post-partum women — several reviewers specifically mentioned using it after pregnancy and breastfeeding to address multiple deficiencies Anyone wanting D3+K2+iodine without managing three separate supplements

iHerb £14.36

View full review →

What does the data say about NOW Foods MK-7 Vitamin... vs Vitamins D and K with ...?

These two products share the same MK-7 form of vitamin K2, but that's roughly where the similarities end. NOW Foods delivers a focused, single-ingredient supplement — 100mcg of MenaQ7® MK-7, a clinically studied branded form with strong bioavailability credentials, in a clean capsule with virtually no unnecessary excipients. Life Extension takes a different approach entirely: 5,000 IU of D3, an unspecified amount of K2 (MK-7), and 1,000mcg of sea-derived iodine all in one capsule. That last figure is striking — 667% of the UK NRV for iodine is a therapeutic dose, not a maintenance one, and the D3 level similarly demands periodic blood monitoring to avoid toxicity over time.

For most people simply wanting to ensure their vitamin K2 intake is covered — particularly those already taking a separate D3 supplement or calcium — NOW Foods at £21.99 (scoring 85/100) is the cleaner, more controllable option. Its Non-GMO, Kosher, Soy-Free, GMP certifications and third-party testing add genuine peace of mind, and the formulation gives you exactly what you're paying for without overlap. Life Extension at £14.36 (scoring 79/100) makes sense for someone juggling multiple deficiencies simultaneously and happy to accept higher doses under medical supervision — it's convenient, but that convenience carries real caveats.

Practically speaking, neither product raises allergen concerns for most users. NOW's 60-capsule count lasts two months at daily use, which isn't exceptional economy, but the bottle-per-bottle price reflects decent quality. Life Extension is cheaper upfront but unsuitable as a casual daily supplement without confirmed deficiency and ideally a GP conversation first, given the iodine and D3 doses involved.

NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules Winner 85.0/100

NOW Foods MK-7 Vitamin K-2 100mcg is a well-regarded standalone K2 supplement using the branded MenaQ7® menaquinone-7 form, which reviewers consistently praise for its superior bioavailability and longer half-life compared to MK-4.

Effectiveness

NOW Foods MK-7 V..

83.0/100

Vitamins D and K..

77.0/100

Ingredient Quality

NOW Foods MK-7 V..

90.0/100

Vitamins D and K..

82.0/100

Value for Money

NOW Foods MK-7 V..

79.0/100

Vitamins D and K..

68.0/100

Side Effects

NOW Foods MK-7 V..

91.0/100

Vitamins D and K..

80.0/100

Certifications

NOW Foods MK-7 V..

93.0/100

Vitamins D and K..

38.0/100

What are the key differences?

NOW Foods MK-7 Vitamin .. is best for: Adults supplementing vitamin D3 at any dose, People taking calcium supplements seeking proper bone deposition

Vitamins D and K with S.. is best for: People with confirmed vitamin D deficiency who also want calcium-routing K2 support in one capsule, Those with low sun exposure — referenced by multiple reviewers as the core reason for purchase

Frequently Asked Questions

Which is better, NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules or Vitamins D and K with Sea-Iodine, 60 Capsules? ▼

NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules scores 85.0/100 overall while Vitamins D and K with Sea-Iodine, 60 Capsules scores 73.0/100. NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules comes out ahead, scoring higher on effectiveness (83.0 vs 77.0). NOW Foods MK-7 Vitamin K-2 100 is best suited for Adults supplementing vitamin D3 at any dose and People taking calcium supplements seeking proper bone deposition. Vitamins D and K with Sea-Iodi is better for People with confirmed vitamin D deficiency who also want calcium-routing K2 support in one capsule and Those with low sun exposure — referenced by multiple reviewers as the core reason for purchase.

Is NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules worth the price compared to Vitamins D and K with Sea-Iodine, 60 Capsules? ▼

NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules costs £21.99 while Vitamins D and K with Sea-Iodine, 60 Capsules is £14.36. For value, NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules scores 79.0/100 vs Vitamins D and K with Sea-Iodine, 60 Capsules's 68.0/100. NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules delivers better value relative to its quality.

Which has fewer side effects? ▼

NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules scores 91.0/100 for side effects (higher means fewer reported issues) while Vitamins D and K with Sea-Iodine, 60 Capsules scores 80.0/100. Reviewers report fewer side effects with NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules. For certification and testing, NOW Foods MK-7 Vitam scores 93.0/100 vs Vitamins D and K wit's 38.0/100. Always consult a healthcare professional before starting any supplement.

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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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