Melatonin was discovered in 1958.
[3] It is sold
over the counter in Canada and the United States.
[8][9] In the United Kingdom it is a prescription-only medication.
[6] A month's supply costs about US $1 to 4 in the United States.
[5][8] In the United Kingdom a month's supply costs the
NHS about 15 pounds per month.
[6] It is not
FDA-approved for any use.
[8] In Australia and Europe, it is approved for trouble sleeping in people over the age of 54.
[16]