Micronutrients

Best vitamin D supplements

from Mag. Margit Weichselbraun
on 09.09.2025
Traditional Tuscan farmhouse surrounded by cypress trees and golden wheat field under blue sky  Italienisch (IT):

Want to optimise your vitamin D levels, but find it difficult to choose from the huge range of supplements available? That's understandable! We'll show you what really matters.

Best vitamin D: How do vitamin D supplements differ?

First things first: there is no such thing as the perfect vitamin D supplement for everyone – our needs are simply too different. However, you should always make sure to choose a high-quality product and select the right dosage for you.

Overview of distinguishing features of vitamin D supplements

  • Dosage forms: Vitamin D drops, capsules or tablets? You are probably familiar with these classic variants. However, there are now also more modern alternatives such as sprays, lozenges or gums.
  • Dosages: The range is wide: low-dose preparations start at 400 IU (international units) and are taken daily. High-dose variants with up to 30,000 IU (international units), on the other hand, are designed to be taken less frequently.
  • Active ingredient & raw material: In supplements, you will usually find vitamin D in two forms: either as vitamin D2 (ergocalciferol) or as vitamin D3 (cholecalciferol). For a long time, vitamin D3 was mainly obtained through UV irradiation of wool wax (lanolin). However, there is now also a vegan alternative made from lichen or algae. Vitamin D2, on the other hand, is produced purely from plants and used to be the only vegan option for obtaining vitamin D. The body can utilise both forms of vitamin D, but studies show that vitamin D3 is significantly more effective.
  • Ingredients: Vitamin D supplements do not always contain only vitamin D. Sometimes they contain other beneficial nutrients such as vitamin K2 or magnesium, which support the effect of the sun vitamin. But your body does not need everything that is in it – so look for a high-quality formula without unnecessary additives.

What distinguishes the best vitamin D drops and capsules? And what about tablets?

To choose the perfect vitamin D supplement for you, there are certain quality characteristics you should look out for. The key factors are good absorption, the right dosage for your individual needs and ingredients that are as pure as possible.

  • Vitamin D drops are particularly easy to absorb, as the fat-soluble vitamin is already dissolved in oil. They are easy to take, can be individually dosed and can be taken independently of meals – particularly practical when on the go. However, drops often have a shorter shelf life than other dosage forms.
  • Vitamin D tablets are among the classics. However, almost all tablets contain unnecessary additives such as colourings or flavourings. It is worth taking a look at the list of ingredients!
  • Vitamin D capsules are impressive due to their purity, as they usually do not contain any unnecessary additives. They are hygienic, have a long shelf life and are well tolerated. Important: If they do not contain oil, you should take them with a fatty meal so that your body can absorb the vitamin optimally.

BIOGENA vitamin D supplements in comparison

At BIOGENA, you will find a whole range of high-quality vitamin D supplements – because individual needs deserve tailor-made solutions. Whether it's innovative NutriGellets® technology for protected vital substances, a combination with high-quality linseed oil or supplements with important cofactors such as vitamin K2 or magnesium – here you will find exactly what suits you. Quality and purity that make all the difference!

Product

Ingredients

Characteristics

Vitamin D3 drops

Per drop:

  • 1000 IU vitamin D3 (= 25 µg)
  • In liquid drop form
  • Easy to use and dose
  • Well suited for higher doses
  • Pleasantly neutral taste
  • FREE from medium-chain triglycerides and inferior oils (palm oil)
  • With high-quality sunflower oil for optimal absorption
  • Vegetarian
Junior vitamin D3 for children

Per drop:

  • 400 IU vitamin D3 (= 10 µg)
  • In liquid drop form
  • Easy and individually dosable
  • Recommended intake – optimally tailored to children
  • Child-friendly and uncomplicated
  • For children of all ages – and the whole family
  • FREE from medium-chain triglycerides and inferior oils (palm oil)
  • With coconut oil for optimal absorption
  • Neutral taste
  • With natural vitamin E to stabilise the high-quality oil
  • Vegetarian
Vitamin D 2000 DUO Gold

Per capsule:

  • 2000 IU vitamin D3 (=50 µg)
  • 25 mg virgin linseed oil
  • 0,8 mg lutein
  • Innovative NutriGellets® technology to improve bioavailability + protect active ingredients
  • With high-quality virgin linseed oil to further improve vitamin D absorption
  • Well suited for higher targeted dosages
  • With the antioxidant plant substance lutein
  • With high-quality fish gelatine capsule
  • The capsules can be opened for immediate consumption
Vitamin D3 2000 vegan

Per capsule: 

  • 2000 IU vitamin D3 (= 50 µg)
  • High-dose vitamin D3 supplement
  • Well suited for high dosages
  • Purely plant-based alternative made from lichen
  • 100% vegan
High-dose vitamin D3 (15.000 IU)

Per capsule: 

  • 15.000 IU vitamin D3 (= 375,2 µg)
  • 394 mg magnesium
  • Vitamin D3 in particularly high doses
  • Easy to take, only once a week
  • Also suitable for high targeted intake under medical supervision
  • With magnesium – for the conversion of vitamin D into its active form
  • Vegetarian
Vitamin D3 & K2 capsules

Per capsule:

  • 1000 IU vitamin D3 (= 25 µg)
  • 75 µg vitamin K2 as MK-7
  • 32,5 mg virgin linseed oil
  • 0,8 mg lutein
  • The powerful duo – ideally combined for bone health
  • Vitamin K2 in its most effective form as all-trans MK-7 (K2VITAL®)
  • Innovative NutriGellets® technology to improve bioavailability + protect the active ingredients
  • With linseed oil for optimal absorption
  • With the antioxidant plant substance lutein
  • With high-quality fish gelatine capsule
  • The capsules can be opened for immediate consumption
Vitamin D3 & K2 drops

Per drop:

  • 5000 IU vitamin D3 (= 125 µg)
  • 62,5 µg vitamin K2
  • The powerful duo – ideally combined for your bones
  • 2:1 ratio of D3 & K2 per drop
  • Vitamin K2 in its most effective form as all-trans MK-7 (K2VITAL®)
  • With coconut oil for optimal absorption
  • With natural vitamin E to stabilise the high-quality oil
  • Tasteless
  • Dropper cap allows for easy and precise dosing
BIOGENA SPORTS D3 & K2 liquid

Per drop:

  • 2000 IU vitamin D3 (50 µg)
  • 25 µg vitamin K2 (K2VITAL®)
  • Developed for athletes
  • The powerful duo – ideally combined for your bones
  • 2:1 ratio of D3 & K2 per drop
  • Vitamin K2 in its most effective form as all-trans MK-7 (K2VITAL®)
  • With coconut oil for optimal absorption
  • With natural vitamin E to stabilise the high-quality oil
  • Tasteless
  • Easy to dose thanks to the integrated pipette

Which vitamin D compounds are contained in our products?

At BIOGENA, we exclusively use vitamin D3 – the form that your body can utilise most effectively. Depending on the preparation, the D3 contained is either vegetarian or vegan. You can easily recognise our vegan variants by the word ‘vegan’ in the product title. Why not vitamin D2? Because D3 is the significantly more effective form for the human organism. For your optimal supply – in the usual radical BIOGENA quality!

Which vitamin D is best absorbed?

As already mentioned, the best choice is vitamin D3 (cholecalciferol) – the bioactive variant that the body can absorb particularly well and utilise for itself.

Tip for optimal absorption: Vitamin D is fat-soluble, so you should take it either in oil-soluble form (e.g. as a spray or drops) or with a meal containing fat. This allows your body to utilise it in the best possible way!

To vitamin D drops

Best high-dose vitamin D

High-dose vitamin D supplements are an easy way to get plenty of vitamin D – often just one capsule a week is enough to meet your needs. But as always, quality comes first! Look for a reputable manufacturer, maximum purity, high-quality carrier oils and the right form of vitamin D (vitamin D3) so that your body can make the most of the vitamin.

To vitamin D 15.000

Best vitamin D for children

When it comes to the little ones, one thing matters above all else: quality! High-quality vitamin D supplements for children rely on vitamin D3 dissolved in high-quality oil – this allows the body to absorb it optimally. It is also important to have a child-friendly dosage and a pure formula without unnecessary additives. Because only the best is good enough for our little ones!

Many parents prefer liquid vitamin D, but it is not always easy to get the drops into the mouths of babies and toddlers. A little trick: simply put it on a spoon, dummy or nipple – this usually makes it easy to administer. Those who prefer tablets or capsules can dissolve the contents on a spoon and offer them to their child. This makes the daily vitamin D supply child's play!

To vitamin D for children

Best vitamin D during pregnancy

There is no such thing as the perfect product for every pregnant woman. But two things should always be at the forefront of your decision – the quality of the preparation and a dosage that suits your needs.

Many pregnant women like to use drops. No wonder: vitamin D3 is already dissolved in oil here – which means your body can absorb it particularly easily, even if you take it without a meal. Drops are also easy to take and can be dosed individually. The only disadvantage? They often do not have quite as long a shelf life as capsules or tablets.

Tablets are one form available on the market. They are practical, but be careful: some contain colourings or flavourings that your body does not really need. It is worth taking a close look!

Capsules score particularly highly in terms of purity: they usually contain no unnecessary additives, are hygienic and have a long shelf life. Important to know: if they do not contain oil, it is best to take them with a fatty meal so that your body can absorb the vitamin D optimally.

Our tip: listen to your gut feeling – and pay attention to quality, purity and a form that suits your preferences.

Best vitamin D for preventing osteopenia and osteoporosis

When it comes to preventing osteopenia and osteoporosis, one rule remains the same: when it comes to vitamin D, one thing matters above all else – quality!

It's best to choose a product with pure, readily available vitamin D3 – without any unnecessary additives. Even better: combine the sun vitamin with other bone heroes such as calcium, vitamin K2, silicon or boron. Because as a team, they are simply unbeatable.

Our tip for you: rely on clever combinations that are perfectly matched – for strong bones you can rely on.

About the complex with vitamin D, calcium, etc.

Best vitamin D & K2

More and more people want a supplement containing vitamins D and K – a proven combination for calcium metabolism and bone health. But as demand grows, so does supply – and unfortunately, not always in a trustworthy way. Many products contain inferior ingredients or unnecessary additives that can compromise their effectiveness.

To be on the safe side, buy products from trustworthy manufacturers and make sure that they are free of unnecessary additives and contain the right compounds. Because not all forms of vitamins are the same! Some manufacturers rely on variants that are easy to produce or have a long shelf life, but cannot be optimally utilised by the body. For vitamin D and K in their best form, you should opt for high-quality vitamin D3 and K2 as all-trans MK-7 – because these forms can be optimally absorbed and utilised by your body.

To vitamin D3 K2 drops

Best vitamin D for athletes

Vitamins D3 and K2 – two powerful allies, even when it comes to sport. Athletes can rely on this duo when it comes to muscles, bones and immune defence. Together, they help you get the best out of yourself – whether in training or competition.

But as always, quality is king. It's worth taking a closer look, especially at combination products for athletes. Make sure your supplement comes from a trustworthy manufacturer, without unnecessary additives – and above all, with the right forms of vitamins. Because not everything called ‘vitamin D’ or ‘vitamin K’ provides your body with the same benefits.

For maximum bioavailability, we recommend vitamin D3 plus vitamin K2 in the high-quality all-trans MK-7 form. Your body can absorb this compound particularly well – allowing you to concentrate fully on your performance.

Our tip for you: Easy-to-dose liquid forms are particularly practical – a reliable choice if you want your intake of vitamin D3 and K2 to run smoothly.

Comparison of applications

  Vitamin D3 drops Vitamin D 2000 DUO Gold Vitamin D3 2000  vegan Vitamin D3 15.000 Junior vitamin D3 Vitamin D3 & K2 Vitamin D3 & K2 drops BIOGENA SPORTS D3 & k2 liquid
Severe shortage ✓✓ ✓✓ ✓✓
Children/adolescents ✓✓
Difficulty swallowing ✓✓ ✓✓ ✓✓ ✓✓
Vegetarian
Vegan X X ✓✓ X X X X X
Fish allergy X X
Fructose-free
During pregnancy X
Ostopenia/Osteoporosis X ✓✓ ✓✓ ✓✓
Athletes ✓✓ ✓✓ ✓✓

✓✓= particularily well suited ✓= well suited X = not suitable

Our product test winner & best vitamin D supplement: BIOGENA Vitamin D3 drops

Our vitamin D3 drops are the perfect all-rounder: lightweight and individually dosable (1000 IU per drop), easy to use and also suitable for therapeutic use. The base of high-quality sunflower oil ensures optimal absorption of the fat-soluble vitamin. The best part? The drops are free from palm oil, neutral in taste and, on top of that, vegetarian. In true BIOGENA style, a genuine premium product for your daily vitamin D supply!

biogena-line
bestseller
Vitamin D3 drops
Pure Vitamin D3 with high-quality sunflower oil – in easy-to-use drops
To the product
€19.90
Vitamin D3 Tropfen

Conclusion: Vitamin D is as individual as you are – but one thing always applies: choose high-quality vitamin D3, avoid products with unnecessary additives and inferior ingredients, and select a dosage that suits you. This will ensure your body gets the best possible supply of vitamin D! To find out your individual vitamin D requirements, we recommend a blood test. Rapid tests can even give you information about your current vitamin D status within 15 minutes.

Frequently asked questions:

Your body produces vitamin D itself – provided your skin gets enough sunlight. However, the supply from the sun is often insufficient. High-quality vitamin D3 supplements can help to support your supply in a targeted manner!

It is impossible to say which vitamin D is best for women in general, as individual needs vary too greatly. In any case, vitamin D3 is the best compound for optimal supply, as your body can absorb and utilise this form particularly well. Also, look for a pure formula without unnecessary additives for maximum tolerability and best effectiveness!

There is no such thing as one perfect vitamin D supplement for everyone. After all, everyone has different needs. But there are a few things you should always look out for: the use of easily absorbable vitamin D3, a pure formula without unnecessary additives or inferior ingredients, and a dosage that is right for you – particularly practical for families: our flexibly dosed vitamin D3 drops.

To ensure that your body can optimally absorb and utilise vitamin D, you should choose products containing vitamin D3 (cholecalciferol). This form is significantly more effective than vitamin D2 – that's why it's worth choosing products containing vitamin D3!

Vitamin D is generally well tolerated. Also, make sure you choose a high-quality carrier oil and a composition without unnecessary additives – this will ensure that your vitamin D is particularly well tolerated!

In order for your body to make optimal use of vitamin D, it is important to take the right form and dosage. Vitamin D3 (cholecalciferol) is the variant that your body can utilise particularly well. As vitamin D is fat-soluble, it is best taken in oil-soluble form or together with a fatty meal.

Reference:

Schmidbauer C, Hofstätter G. 2020: Mikronährstoff-Coach: Das große BIOGENA-Kompendium der Nährstoffe. 1158 Seiten.

More articles
Obtaining vitamin D from the sun
Vitamin D (calciferol): more than just a vitamin for bones
Without the sun, life is impossible – this applies to plants, animals and humans alike. We need sunlight to produce the important vitamin D. Find out more about vitamin D, its production and its effect on our body here.
Man with vitamin D deficiency
Vitamin D deficiency – under-supplied despite sunlight?
Sunlight that tickles our nose not only warms our hearts, but is also the key to a vital nutrient - vitamin D. Paradoxically, despite seemingly adequate sunlight, up to 57 per cent of adults suffer from a vitamin D deficiency - a silent health risk...
Vitamin D in pregnancy
Vitamin D has been discussed for years. Its relevance is undisputed even before pregnancy. But why is vitamin D also important for expectant mothers, how high is the need when you are pregnant and what is there to consider when taking vitamin D? Let...