If you only take one supplement this year, make it Vitamin D3 combined with K2.Here in the UK, we simply don’t get enough sunlight for our bodies to produce adequate Vitamin D — and the consequences are bigger than most people realise. Low energy, weakened immunity, poor bone health and even low mood have all been linked to Vitamin D deficiency.But here’s what most people don’t know: taking Vitamin D3 without K2 is only half the job.Vitamin K2 is the essential partner — it directs calcium to your bones and teeth where it belongs, rather than letting it build up in your arteries. Together, D3 and K2 are one of the most powerful combinations in the supplement world.

What We Reviewed
SuperSelf Vitamin D3 4000IU + K2 MK7 100mcg — 120 Capsules (UK Made)
This is one of the best-selling D3+K2 supplements on Amazon UK, and for good reason.

Key Facts
Vitamin D3: 4000IU (Cholecalciferol)
Vitamin K2: 100mcg (MK-7 form — the most bioavailable)
Capsules: 120 (4 month supply)
Suitable for: Vegetarians
Made in: UK
Allergens: Gluten-free, dairy-free

Who Is This For?
This supplement is ideal for:
Anyone living in the UK (virtually everyone is deficient from October to April)
People over 40 who need extra bone support
Anyone who works indoors most of the day
Those looking to support their immune system year-round
People who want to look after their long-term heart health

What the Research Says
Vitamin D3 and K2 work as a team. D3 increases calcium absorption from food and supplements. K2 (specifically MK-7, the form used here) then activates proteins that direct that calcium into your bones — and away from soft tissues like your arteries.
The MK-7 form of K2 used in this product stays active in your body for over 24 hours, making it far more effective than the cheaper MK-4 form used in many budget supplements.

Our Verdict
⭐⭐⭐⭐⭐ 5/5
This is exactly what a D3+K2 supplement should look like. The 4000IU dose of D3 is optimal for UK adults, the MK-7 form of K2 is the gold standard, and the fact it’s UK made adds an extra layer of quality assurance. The price per capsule is excellent for what you’re getting.

✅ Pros
Optimal D3 dose for UK adults (4000IU)
Premium MK-7 form of K2 (stays active 24+ hours)
UK manufactured to high standards
Vegetarian-friendly capsules
No fillers, gluten-free and dairy-free
Excellent value for money

❌ Cons
Not suitable for vegans (capsule shell)
120 capsules = 4 month supply (not a full year)

How to Take It
Take 1 capsule per day with your largest meal, ideally one that contains healthy fats (like eggs, avocado or olive oil) — this significantly improves absorption of both D3 and K2.

Results Timeline

Timeframe
What to Expect
Week 1-2
Better sleep quality for some users
Month 1
Gradual improvement in energy levels
Month 2-3
Improved mood, particularly in winter
Month 3+
Long-term bone and cardiovascular support

Where to Buy
👉 Check Current Price on Amazon UK
As an Amazon Associate,

MineroLab earns from qualifying purchases. This helps us keep our reviews free and independent.