Who should not start taking it without consulting a doctor? — weight loss + prebiotic, Sibirskaya Kletchatka , 300 GR

Although dietary fibre is a familiar part of the diet, in the form of a concentrated supplement it may behave differently from the fibre in ordinary food. There are several situations in which it is sensible to consult a doctor before you start taking it.

Sensitive digestion. With irritable bowel syndrome, chronic inflammatory gastrointestinal diseases or a tendency to bloating, a sharp increase in fibre may worsen the symptoms. A doctor will help you choose the pace of introduction and assess whether this particular type of fibre is suitable for you.

Pregnancy and breastfeeding. During these periods any supplements, including the plant ingredients they contain, are worth discussing with a specialist — not because the product is inherently dangerous, but because the body's needs change.

Taking medication. Fibre may affect how quickly some medicines are absorbed in the gut. If you take medicines on a regular basis, check with your doctor or pharmacist whether there are any interactions.

If you are hypersensitive to any of the ingredients, the product should not be used, and if allergic reactions occur, stop taking it and see a doctor. The mix is based on wheat grain husk, and wheat is a gluten-containing cereal, so the product is not suitable for people with coeliac disease or wheat allergy. Otherwise, a healthy adult can usually introduce fibre into their diet on their own — gradually and with enough water.