DSIP
Delta sleep-inducing peptide · emideltide
What it is
A nine-amino-acid peptide first isolated in 1977 from rabbits in an induced sleep state.
How it’s thought to work
Unclear. No dedicated receptor has been identified, and its role in normal sleep is not established.
What the research shows
- —A small number of human studies, mostly from the 1980s, with mixed and inconsistent results on sleep.
- —Research largely stopped after that; there are no modern controlled trials.
Risks and side effects
- —Little safety information in humans. FDA cites possible immune reactions and says it lacks the information to know whether it causes harm.
Regulatory status
- —Not approved by FDA for any use.
- —FDA put it in “category 2” of its compounding policy — substances that may present significant safety risks. The nomination was later withdrawn, and in April 2026 FDA moved it to the “nominated but withdrawn” list on the same page, which still sets out its safety concerns. Withdrawal does not make it approved, and it does not place it in category 1 (the substances FDA is still evaluating for compounding).
- —It was one of the peptides reviewed at FDA’s Pharmacy Compounding Advisory Committee in July 2026. The committee’s votes are recommendations only; as of 2 October 2026 FDA has not added it to the list of substances pharmacies may compound.
Sources