DSIP

฿1,690 per vial

A nine amino acid peptide — Delta Sleep-Inducing Peptide — first isolated in the 1970s from the blood of rabbits in induced sleep, and named for the delta-wave activity it appeared to produce. The research since has not settled: some studies report a shorter time to sleep onset and better subjective sleep quality, others find no measurable effect at all. It is also examined for stress-hormone and pain modulation rather than sleep alone. One of the older peptides still in circulation, and one of the least resolved.