Guides
Vitamin supplement guides: buying advice & know-how
Buying criteria, technology and legal matters around vitamins – explained factually, with matching models and current prices from our comparison.
All guides
- Guide · 7 min readVitamin D3 & K2: what does the research say, and who needs it?Hardly any food supplement is bought as often as vitamin D – frequently combined with K2. We put into context what is known about requirements, benefits and risks, and what you should look for when choosing a product.Updated 23/09/2026
- Guide · 7 min readChoosing food supplements wisely: dosage, form, qualityThe range of vitamins and minerals is huge – and so are the advertising promises. This guide helps you read labels, put dosages into context and recognise quality, so that you only buy what you really need.Updated 23/09/2026
- Guide · 7 min readVegan diet: the nutrients you should keep an eye onA well-planned vegan diet can be healthy – provided you pay attention to a few nutrients. Here you'll find out which ones they are, how to cover them through food and where a supplement makes sense or is necessary.Updated 23/09/2026
Popular comparisons
- Vitamin D3 + K260 models · from €7Combination products with vitamin D3 and K2 are among the best-selling food supplements. Here you can compare tablets, capsules and drops and find out how to read dosage information correctly.
- Vitamin D344 models · from €0Pure vitamin D3 without additives comes in many strengths – from 1000 IU daily to a weekly depot. Here you can compare products and find out which amounts expert bodies recommend.
- Vitamin D3 drops19 models · from €7Drops are flexible to dose and easy to swallow. Here you can compare vitamin D3 drops with and without vitamin K2 and find out what to look out for in the dose per drop.
- Magnesium25 models · from €2Magnesium is one of the most popular minerals – as a capsule, tablet, powder or drink granules. Here you can compare products and find out why the compound and the term “elemental” matter.
- Omega-3 & algae oil41 models · from €2Omega-3 supplements vary widely in their EPA and DHA content. Here you can compare fish oil, algae oil and cod liver oil capsules and find out which label details really count.
- Multivitamins A–Z48 models · from €0A multivitamin promises everything in one tablet. Here you can compare A–Z products from drugstore to premium brands and find out how to recognise a sensibly formulated product.