There is no EU-harmonised rule for melatonin. It sits outside the cannabinoid framework entirely and is governed nationally, member state by member state - limits range from 0.3 mg in Belgium to 2 mg in Spain, with several countries setting none at all. The one EU-level figure is the authorised health claim in Regulation (EU) 432/2012, which is conditional on 1 mg per quantified portion.
We identified no Cypriot national maximum for melatonin and no Cypriot decision reclassifying it as a medicine. Cyprus runs food supplements through a notification and licensing regime administered by the Ministry of Health's Public Health Services, under which a product already lawfully distributed as a food supplement in another EU member state ordinarily requires notification rather than a full licence. We found no national list of restricted other substances carrying maximum levels.
That is an absence of evidence rather than a positive confirmation, and we record it as such.