Guide

Vitamins and food supplements

Prepared by the LekCheck team · Last reviewed: 2026-06-27 · How we create our content

Food supplements can complement a balanced diet but do not replace it. Before taking higher doses, or in pregnancy, chronic disease or when taking other medicines, consult a doctor or pharmacist. Some supplements can interact with medicines or affect laboratory tests. Symptoms of a deficiency do not always mean a real shortage of vitamins or minerals. Below are the commonly sought supplements — choose an ingredient to compare products and prices.

This guide was prepared by the LekCheck team and has not been reviewed by a doctor or pharmacist. This article is for general information only and is not medical advice, diagnosis, or treatment. Do not start, stop, or change any treatment without consulting a doctor or pharmacist.

Vitamin D

Vitamin D (cholecalciferol) is often taken for a deficiency, especially during the winter months. The dose depends on individual needs.

Vitamin C, magnesium and zinc

Vitamin C (ascorbic acid), magnesium (often with vitamin B6) and zinc are among the most commonly used food supplements. For each supplement there are recommended daily amounts and upper intake limits.

Iron

Iron supplements are taken mainly for a proven iron deficiency. Taking them without need can be harmful — a consultation and a test before starting are recommended.

Omega-3 and probiotics

Omega-3 fatty acids and probiotics are popular supplements. Choose an ingredient to see the available products and prices.

When to consult

Consult a doctor before taking high doses, in pregnancy or breastfeeding, in chronic disease, or when you take medicines with which there may be an interaction.