It depends on your diet: a dietitian or nutritionist can advise you. A supplement adds a measured amount of one nutrient to your diet. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.

Follow the label of each product: the serving, the daily dose and the warnings. Do not exceed the recommended daily dose. Keep it out of the reach of young children.

If you take medication or have a medical condition, ask your doctor or pharmacist before you start a supplement.

The ingredients, with the allergens in capitals, and the values per serving. It also gives the daily dose, how to take it, the warnings and how to store it.

Free in mainland Spain from €60. Below that it costs €5.12; to the Balearic Islands, €12.67.