Pinealon

In primary cultures of mouse hippocampal neurons under amyloid synaptotoxicity, an in vitro model of Alzheimer's disease, EDR increased the number of mushroom spines by 71% relative to the amyloid-treated condition, returning the count to the untreated control level; the related tripeptide KED increased it by 20% in the same experiment.⁷

In 5xFAD-M transgenic mice, a genetic model of Alzheimer's disease, intraperitoneal EDR prevented the dendritic spine loss seen in saline-injected transgenic animals; the neuroplasticity trend in the same paper came from the KED arm, not EDR. A 2025 correction states its confocal dendrite images for the male and female cohorts were one figure published twice; replacements were supplied and the conclusions stated unchanged.^6,8

In rats made hyperhomocysteinemic by dietary methionine loading during pregnancy, pinealon given to the dams improved the offspring's spatial orientation and learning and reduced both reactive oxygen species accumulation and the number of necrotic cells among isolated cerebellar neurons, compared with untreated hyperhomocysteinemic offspring.⁹

In young and old rats tested in the Morris water maze after acute hypoxic hypoxia, pinealon improved learning measures in both age groups more than the active comparator cortexin, alongside region-specific changes in caspase-3 in cortex and brainstem. This is a Russian-language report and the maze data are described qualitatively rather than as effect sizes.¹⁰

In cell culture using cerebellar granule cells, neutrophils and PC12 rat pheochromocytoma cells under receptor-dependent and receptor-independent oxidative stress, pinealon restricted reactive oxygen species accumulation dose-dependently versus stressed untreated cells and reduced necrotic death on propidium iodide staining. A separate in vitro report from the same programme found the opposite direction, pinealon raising the stationary level of intracellular reactive oxygen species in neurons; the two have never been reconciled.^11,12

In a rat hypobaric hypoxia model comparing four Khavinson peptides, pinealon showed the most pronounced antihypoxic effect of the four tested. The author attributed this to stimulation of endogenous antioxidant enzymes and possible limitation of NMDA excitotoxicity rather than to direct scavenging of reactive oxygen species.¹³

In 18-month-old rats under acute hypobaric hypoxia and mild hypothermia, the comparator cortexin acted more strongly than pinealon on brain free-radical processes and caspase-3 activity. Both peptides were reported to promote accumulation of adrenergic mediators in the brain under hypoxia and of serotonin in the cerebral cortex under hypothermia. This is a Russian-language report without effect sizes.¹⁴

In induced cortical neurons transdifferentiated from skin fibroblasts of elderly human donors, EDR reduced oxidative DNA damage relative to untreated aged induced neurons, and EDR, KED and AEDG each increased primary process number and total dendrite length. EDR did not change mitochondrial or lysosomal activity or p16 levels in the same cells.¹⁵

In induced neuronal cells transdifferentiated from human fetal mesenchymal stem cells, the senescence effects reported were attributed to AEDG and KED, which lowered p21 expression by 15% and beta-galactosidase activity 1.51 to 2.4-fold versus untreated cells. EDR was tested in the same experiment and was not among the peptides producing those effects.¹⁶

In organotypic skin explants from young rats, Glu-Asp-Arg was one of four tripeptides out of five tested that stimulated cell proliferation relative to untreated explants, which the authors attributed to less pronounced apoptosis on p53 immunostaining. In explants from old rats, only Lys-Glu-Asp produced a marked proliferative effect, so the age group in which the effect would matter is the one where EDR did not stand out.¹⁷

In organotypic pineal gland cultures from 3-month-old rats, Glu-Asp-Arg neither stimulated the proliferation marker Ki-67 nor affected the apoptosis marker AIF, whereas Ala-Glu-Asp-Gly and Lys-Glu-Asp both raised Ki-67 and Ala-Glu-Asp-Gly alone stimulated pinealocyte CGRP synthesis. Despite its name, pinealon showed no tissue-specific effect on pinealocytes in this assay.¹⁸

The only identified human report is an uncontrolled open Russian gerontology study of 32 patients aged 41 to 83 with chronic polymorbidity and organic brain syndrome in remission, with no placebo, no randomisation and no blinding. Pinealon and vesugen were given together, so no effect is attributable to pinealon alone; the authors described an anabolic effect and slowed biological-age indicators, and judged vesugen more effective than pinealon.¹⁹