Are there situations in which it is worth consulting a specialist before taking it? — Apple cider vinegar N120 – Swanson

Yes. According to the card, you must consult a doctor during pregnancy and breastfeeding, and also when taking medicines or having diseases; the product is not intended for persons under 18. Do not use if hypersensitive to the components; if side effects appear, stop use and see a doctor; do not exceed the recommended daily amount; keep out of the reach of children; do not use if the protective film under the cap is damaged or missing. Store in a cool, dry place at room temperature.

General information (not a manufacturer's instruction): the card does not name individual conditions (for example, a sensitive stomach), but in those cases too, as with chronic diseases, it is sensible to discuss taking it with a doctor in advance. The product is a dietary supplement, not a medicine, and does not replace a balanced diet.