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Immunity

Vitamin D: when the sun alone is not enough

Olga ZalizetskaCoral Club consultant and independent distributor·Published:October 28, 2026·1 min read
Vitamin D: when the sun alone is not enough

Table of contents

  1. What is it needed for
  2. Where to get it from
  3. How much do you need
  4. Convenient form

Vitamin D is often called the sunshine vitamin, and it's a good name because most of its stores are produced in the skin under the influence of UV rays. The problem is that in our climate, there is simply too little of this sun for many months.

What is it needed for

Vitamin D helps with the proper absorption of calcium, contributes to maintaining healthy bones and the proper functioning of muscles. It also plays a part in the proper functioning of the immune system.

Where to get it from

  • Sunlight. In Poland, the skin produces less of it roughly from September to April.
  • Food. It occurs naturally in few products, mainly in fatty fish. Some products are fortified with it.
  • Supplementation. Often the simplest way to replenish it in autumn and winter.

How much do you need

It depends on age, body weight, lifestyle, and the season. The American NIH states 15 µg (600 IU) daily for healthy adults, and 20 µg (800 IU) after age 70. Polish recommendations may vary, therefore the dose is best determined with a doctor based on a 25(OH)D blood test.

Convenient form

D-Spray is vitamin D3 in MCT coconut oil, in a spray form administered directly to the mouth. One application is 10 µg of vitamin D, and a 10 ml package is enough for about 170 applications. The manufacturer recommends performing a 25(OH)D test and consulting the result with a doctor or pharmacist.

Don't know where to start? Write to us or call: we'll be happy to talk about your daily routine and answer your questions.

The text is for informational purposes and does not replace the advice of a doctor or nutritionist. A dietary supplement cannot replace a varied diet.

About the author

Olga Zalizetska

Olga Zalizetska

Coral Club consultant and independent distributor

Olga Zalizetska is one of the most experienced and trusted Coral Club consultants and distributors in Poland. She has worked continuously since 2006, has served more than 40,000 customers, and offers free, personalised supplementation consultations in Polish, Russian and English.

+48 783 893 588Author profile and all articles

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