Viatmin D

Vitamin D at Viterna: drops and capsules, often combined with vitamin K2, from Optiolex, Dr. Wunder, Robert Franz, Cosmoterra and other brands. In the guide below you will learn what vitamin D is needed for, where it comes from and what to look out for when taking it. Read the guide ↓
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The body makes most of its vitamin D itself when sunlight falls on the skin.

At our latitudes, the sun is hardly strong enough for this from October to March. Food provides only small amounts; oily fish such as herring or salmon and eggs contain the most.

As a food supplement, vitamin D usually comes as vitamin D3 (cholecalciferol), in drops or capsules, often together with vitamin K2.

Vitamin D in brief
  • Recommended per day: 20 µg (800 IU) if the body cannot make its own vitamin D (D-A-CH)
  • Main source: sunlight on the skin
  • From food: oily fish, eggs, small amounts in mushrooms
  • Forms: drops, capsules, with or without K2

What vitamin D is needed for

The EU has authorised several health claims for vitamin D. Here is a selection in their exact wording:

Vitamin D contributes to the maintenance of normal bones.
Vitamin D contributes to the maintenance of normal teeth.
Vitamin D contributes to the maintenance of normal muscle function.
Vitamin D contributes to the normal function of the immune system.
Vitamin D contributes to normal blood calcium levels.
Vitamin D has a role in the process of cell division.

Good to know when taking it

With a meal containing fat: Vitamin D is fat-soluble. The body absorbs it better with a meal that contains some fat.
IU and µg: Labels state vitamin D in micrograms (µg) or international units (IU). 1 µg equals 40 IU.
Add up the amounts: Vitamin D is also found in multivitamins. Add all products together and stick to the recommended intake.
Count drops carefully: With drops, the amount depends on the number of drops. The product page shows how much one drop contains.
Viterna tipOptiolex Vitamin D3 & K2 Drops: Vitamin D3 and K2 in drop form from Optiolex in Styria. To the product

Frequently asked questions

How much vitamin D do I need per day?+
If the skin cannot make vitamin D, the D-A-CH societies recommend 20 µg (800 IU) per day.
Why is vitamin D often combined with K2?+
Many manufacturers combine the two fat-soluble vitamins. For vitamin K, the authorised claim is: Vitamin K contributes to the maintenance of normal bones.
Drops or capsules?+
Both work. Drops can be dosed finely, capsules are handy on the go.
When is the best time to take vitamin D?+
With a meal that contains some fat. Stick to the recommended intake on the product.

More vitamins such as vitamin C, B12 and K can be found under Vitamins, all nutrient groups under Nutrients.

Note: Food supplements are not a substitute for a varied and balanced diet and a healthy lifestyle. Do not exceed the recommended daily dose. Keep out of the reach of young children.