DSIP has the most misleading name in this catalog, and it is worth saying so before anything else. Delta Sleep-Inducing Peptide was named in 1977 for the conditions under which it was discovered, not for an effect established in people. The human evidence that it induces sleep is limited and inconsistent, and we are not going to pretend otherwise.
What remains is a genuinely interesting research subject: a nine-amino-acid peptide studied in relation to slow-wave sleep architecture, the stress axis, and hormone regulation. It is prescribed only when a licensed provider reviews your health history and determines it is appropriate for you.

