Melatonin sits outside any EU-harmonised framework for food supplements. Member states set their own rules, and those rules differ considerably from one country to the next.
Bulgaria sets no national maximum for melatonin. The Ordinance on Food Supplements (Наредба за хранителните добавки), in force since 30 December 2021 and amended through 7 July 2026, sets upper levels for vitamins and minerals and makes no provision for melatonin at any dose. Melatonin has not been reclassified as a medicine in Bulgaria at any strength.
Bulgarian pharmacies and supplement retailers openly sell melatonin food supplements at 3 mg, 4 mg, 5 mg and 10 mg per daily dose, which is consistent with the absence of a national ceiling.