In short: Vitamin D3 (cholecalciferol) is one form of vitamin D: a fat-soluble vitamin that is also produced in the skin when exposed to sunlight, and smaller amounts can be obtained from foods such as oily fish and egg yolks. Vitamin D contributes to normal absorption/utilization of calcium and phosphorus, to the maintenance of normal bones and to the normal function of the immune system.
Edited by: Vitafoodonline.hu editorial team · Last updated: October 21, 2026
Contents
- Why does the body need vitamin D?
- What forms are there: D3 or D2?
- Who may want to pay attention to their vitamin D intake?
- What to look for when buying vitamin D3
- Comparison of our products containing vitamin D
- Related products
- Frequently asked questions
- Ordering vitamin D3 from Vitafoodonline.hu
Why Does the Body Need Vitamin D?
Vitamin D is one of the fat-soluble vitamins, so the body can also store it in fatty tissue and the liver. According to the health claims authorized in the European Union, vitamin D:
- contributes to normal absorption/utilization of calcium and phosphorus;
- contributes to normal blood calcium levels;
- contributes to the maintenance of normal bones;
- contributes to the maintenance of normal teeth;
- contributes to the maintenance of normal muscle function;
- contributes to the normal function of the immune system;
- has a role in the process of cell division.
Because calcium and vitamin K also play a role in bone health, vitamin D3 is often offered together with vitamin K2 – you can read more about this on our vitamin K2 glossary page.
What Forms Are There: D3 or D2?
Two forms of vitamin D are known and used in food supplements:
- Vitamin D3 (cholecalciferol): this is the form produced in human skin when exposed to sunlight. In food supplements it is most often made from wool grease (lanolin), but vegan vitamin D3 derived from lichen is also available.
- Vitamin D2 (ergocalciferol): a form of plant and fungal origin, found for example in mushrooms exposed to UV light.
In terms of format, vitamin D3 is available as oil-based drops, in softgel capsules, and as part of multivitamins, syrups and powders. Because it is fat-soluble, liquid products typically contain it dissolved in oil – for example, extra virgin olive oil. Labels state the amount in micrograms (µg) or international units (IU); the conversion between the two is 1 µg = 40 IU.
Vitamin Finder – free, 1 minute
Which D3 product is right for you? Based on 5 short questions, we recommend 2–3 in-stock products – by age, goal, form and budget.
Who May Want to Pay Attention to Their Vitamin D Intake?
How much vitamin D the skin produces depends on the season, the time spent in the sun and how much of the skin is covered, so many people pay conscious attention to their intake. These may include, for example:
- people who spend most of their day indoors or in an office;
- people who want to supplement their diet during the less sunny fall and winter months;
- people who rarely eat fish and eggs;
- older adults, as the skin's vitamin D production generally decreases with age;
- people following a vegan diet, who should also check the source of their vitamin D3;
- pregnant and breastfeeding women, who should ask their doctor for advice about their intake.
For infants and children, your pediatrician can always advise you on the right product and amount. If you are curious about your own vitamin D status, your doctor can give you an accurate picture based on a lab test.
What to Look for When Buying Vitamin D3
- Form: check whether the product contains vitamin D3 (cholecalciferol) or vitamin D2.
- Amount and NRV%: the label shows how many µg (IU) one serving contains and what percentage of the nutrient reference value (NRV) it covers. Do not exceed the recommended daily dose; ask your doctor or pharmacist about the amount that is right for you.
- Carrier: liquid D3 products typically contain the vitamin dissolved in oil, since it is fat-soluble.
- Additional ingredients: you can decide whether you are looking for D3 on its own, a D3+K2 combination, or a multivitamin that also contains vitamin D.
- Vegan and allergen-free: for a vegan diet, D3 derived from lichen is the right choice; also check whether the product is gluten-free, lactose-free and sugar-free.
- Age: the packaging states from what age the product can be given.
If you would also like to consider magnesium in relation to bone health, see our magnesium glossary page, and if you follow a vegan diet, it is also worth reading about vitamin B12.
Comparison of Our Products Containing Vitamin D
The following MARNYS products, currently in stock, contain vitamin D. You will always find the exact composition and dosage on the packaging.
| Product | Form | Size | For whom |
|---|---|---|---|
| Marnys Vitamin D3 Drops | Liquid drops, vitamin D3 in extra virgin olive oil | 30 ml | For children from infancy and for adults, also during pregnancy and breastfeeding |
| Marnys Vitamin K2 and D3 Drops | Liquid drops, D3 and K2 in olive oil | 30 ml | For children aged 7 and over and for adults |
| Marnys Cebida Multivitamin Drops | Fruit-flavored drops with 6 vitamins (including vitamin D) | 30 ml | For children aged 4 and over and for adults |
| Marnys Junior Vit | Forest fruit-flavored syrup with 12 vitamins and royal jelly | 125 ml | For ages 5 and over |
| Marnys Artrohelp Marine | Vanilla-flavored powder with fish collagen, vitamin D3 and vitamin K2 | 350 g | For adults |
Related Products
- Marnys Vitamin D3 Drops – vitamin D3 drops dissolved in olive oil, dosed with a dropper; gluten-free, lactose-free and sugar-free.
- Marnys Vitamin K2 and D3 Drops – the two fat-soluble vitamins in a single drop, for ages 7 and over.
- Marnys Cebida Multivitamin Drops – fruit-flavored drops with six vitamins, including vitamin D.
- Marnys Junior Vit Liquid Multivitamin – a syrup for children with 12 vitamins, including vitamin D.
- WhiteLab Vitamin D Rapid Test – an informational home rapid test using a fingertip blood sample; it does not replace a medical examination.
Vitamin D Drops and Capsules
Drops for children and adults, including forms combined with K2 – shipped from stock. Orders over 50,000 HUF get a 5% cart discount.
Frequently Asked Questions
What is the difference between vitamin D and vitamin D3?
Vitamin D is a collective name covering several related compounds. The two best-known forms are vitamin D3 (cholecalciferol), which is also produced in the skin when exposed to sunlight, and vitamin D2 (ergocalciferol), which is of plant and fungal origin.
Why are vitamin D3 drops dissolved in oil?
Because vitamin D is a fat-soluble vitamin. In Marnys Vitamin D3 Drops, the carrier is extra virgin olive oil, whose oleic acid content is less sensitive to oxidation, which helps keep the product stable.
How much vitamin D3 should I take?
Please always follow the dosage stated on the packaging and do not exceed the recommended daily dose. For personalized advice – especially for children and during pregnancy and breastfeeding – consult your doctor or pharmacist.
Why are vitamin D3 and vitamin K2 offered together?
Both vitamins carry the authorized claim that they contribute to the maintenance of normal bones, and vitamin D also contributes to normal absorption of calcium. A combined product contains both in a single serving.
Is vitamin D3 vegan?
Not always. Vitamin D3 is often made from lanolin, that is, wool grease, but vegan D3 derived from lichen is also available. If you follow a vegan diet, check the source in the product description.
Ordering Vitamin D3 from Vitafoodonline.hu
Order conveniently from the Vitafoodonline.hu webshop! Choose from our vitamin D3 drops, D3+K2 combinations and multivitamins that also contain vitamin D – you will find our full range in our MARNYS vitamins and food supplements category. We offer a volume discount on orders of 10 items or more, in-stock products are shipped with next-day delivery available, and our loyalty program lets you save even more with every purchase. Orders over 50,000 HUF get a 5% cart discount, and GLS shipping is free over 20,000 HUF. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle.
