Can melatonin be given to a 17-year-old and in what dosage?

Periodic insomnia, especially in such a young person, should be consulted, for example, with a psychiatrist. It may be necessary to expand the diagnosis. Melatonin in the form of an over-the-counter drug without consulting a doctor can be used in people over 18 years of age. If insomnia is caused, for example, by stress, problems, etc., perhaps in the first place it would be worth considering the use of herbal medicines, e.g. based on valerian, lemon balm and hops, which can be bought at a pharmacy without a prescription and which can be safely used in children over 12 years of age. e.g. 1-2 capsules of Persen forte about an hour before bedtime: https://www.gdziepolek.pl/produkty/60806/persen-forte-kapsulki/apteki?pvid=209698#internetowe 1-2 tablets for half an hour to 1 hour before bedtime: https://www.gdziepolek.pl/produkty/81214/valdix-tabletki/apteki?pvid=105393#internetowe More here: https://www.gdziepolek.pl/artykuly/bezsennosc