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Delta Sleep-Inducing Peptide
Nonapeptide originally isolated from rabbit brain during slow-wave sleep in 1977. Promotes delta slow-wave sleep — the most restorative sleep phase. Studied for circadian rhythm regulation.
EDR tripeptide / Glu-Asp-Arg / Pineal gland tripeptide
A synthetic tripeptide (Glu-Asp-Arg) derived from the pineal gland — part of the same Khavinson bioregulator family as Epitalon and Cartalax but targeting neuronal tissue specifically. Studied for neuroprotection, cognitive function, circadian rhythm regulation, and retinal protection. Russian clinical research from Dr. Khavinson's group spans several decades. English-language independent replication is limited.