The studies and the sleep finding
In its July 2026 review, the US drug agency (FDA) found three studies in people of epitalon itself.
Two used a spray under the tongue in people working nights; the other used injections near the eye for an inherited eye disease.
The studies came from the same research group.
The FDA found no epitalon studies in people with insomnia—ongoing trouble sleeping—or studies of injections under the skin.
Did the spray study show better sleep?
The study described in FDA’s July 2026 review tested a spray over 20 days in night workers with low melatonin, a chemical message linked to sleep.
The researchers tested urine for a leftover made when the body breaks down melatonin. They found more of this leftover after the spray.
The study did not measure sleep. Its report also gave no results about harm, so it does not tell us whether anyone checked for side effects.
A change in that urine test does not prove that people slept better.
What does that leave unanswered?
The human work does not establish that epitalon helps people live longer or improves sleep quality.
FDA’s July 2026 assessment found too little evidence to support epitalon for insomnia.
Ask the doctor or nurse discussing your care to explain the study behind a promised benefit. “What changed for the people in it?” is a useful place to begin.
Make room for this question
“Did the study measure the benefit I am hoping for?”
Read the original records
Read what these studies measured and what they left unanswered.
A short journal summary of the research on melatonin and the urine test.