Immunity
Liquid Vitamin D
Liquid Vitamin D
Liquid Vitamin D
Liquid Vitamin D
Liquid Vitamin D

Liquid Vitamin D

€19,95

50ml • 250 servings • 2 000 IU per serving

Immunity
Immunity

Supports everyday immune function

Heart health
Heart health

Supports cardiovascular function

Evidence-based
Evidence-based

Grounded in modern research

Quality
Quality

Exceptional quality standards
Product form

Frequently bought together
How to use

Take 2 applications daily after breakfast.

The package contains 250 servings (50 ml).

Ingredients

Per Serving

  • Vitamin D3 (cholecalciferol) - 50 μg (2 000 IU)
  • Vitamin K2 MK-7 (MenaQ7) - 37,5 μg
  • MCT oil from coconut
  • Antioxidant: Mixed tocopherols

Gluten free | Allergen free | GMO free

Made in the EU

All our supplements are manufactured in the European Union, where they meet the strictest standards and regularly undergo rigorous quality control.

We do all of this so that you can always rely on your supplements one hundred percent.

Complex Vitamin D3 + K2 MK-7 is a D3 + K2 stack built for athletes and high-performers who want consistent recovery, resilience, and performance year-round.

Vitamin D3 supports far more than immunity - it helps maintain normal muscle function, supports recovery under stress, and plays a role in overall hormonal balance. Despite its proven benefits, vitamin D deficiency remains common because modern life keeps us indoors and UVB levels are too low for meaningful production for months at a time. And if you supplement D3 without K2 (MK-7), the job isn’t fully finished: D3 helps your body absorb calcium, while K2 helps direct it where it belongs, into bones and teeth, instead of letting it drift into soft tissues. 

The result is simple: stronger foundations, better day-to-day readiness, and a smarter way to cover the October–April gap when your body can’t reliably make enough vitamin D on its own.
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FAQs

Delivery and Payment

Orders within the EU and Switzerland are usually delivered in 1–3 business days.

How much does shipping cost?

  • Pickup point (GLS) – €4,49
  • Home delivery (GLS) – €6,59

For all orders over €70, shipping is completely free!

You can pay for your order using the following payment methods:

  • Credit or debit card
  • PayPal
  • Apple Pay, Google Pay, or Shop Pay
  • Bank transfer / QR code
  • 3 interest-free installments via Klarna
When should I take Vitamin D3+K2 MK-7?

After a meal, ideally after breakfast or lunch.

The presence of fats in the meal significantly increases the absorption of vitamin D from your diet.

How can I tell if I have a vitamin D deficiency?

Go for a blood test.

A blood test is the only way to tell whether your vitamin D level in the blood is optimal.

Is vitamin D safe for children as well?

Yes.

However, the exact dosage should always be consulted with a pediatrician.

Can I take too much vitamin D?

Yes.

That’s why you should always follow the recommended dosage, and consult your doctor before taking higher doses.

I have blood test results, how much vitamin D should I supplement?

Breakdown of ideal supplementation based on blood vitamin D levels:

<20 ng/ml (<50 nmol/l) -> 4,000 to 8,000 IU/day -> 4 to 8 weeks, then re-test

20 to 29 ng/ml (50 to 72.5 nmol/l) -> 2,000 to 4,000 IU/day -> 4 to 8 weeks, then re-test

30 to 50 ng/ml (75 to 125 nmol/l) -> less than 2,000 IU/day -> 4 to 8 weeks, then re-test

50 ng/ml (>125 nmol/l) -> Consume foods rich in vitamin D

However, always consult your doctor about the exact dose.

*Current level -> Recommended supplementation

Couldn't find an answer to your question?

In that case, please visit our general FAQs.

Alternatively, drop us a message in the chat on our "Contact" page (bottom right) and we'll get back to you instantly. Prefer email? Reach us at info@officialcomplex.com and we'll reply within 24 hours.

Disclaimer

Food supplement. Not a substitute for a varied and balanced diet or a healthy lifestyle. Do not exceed the recommended daily dose.

If you are taking medication, have a medical condition, are pregnant or breastfeeding, consult a doctor or pharmacist before use. Not suitable for children or persons under 18 years of age.

Keep out of reach of children. Store in a dry place, below 25 °C, protected from direct sunlight and moisture. The minimum durability date is indicated on the packaging.