Kristagen is a Russian bioregulator peptide complex marketed for immune system support, derived from young animal thymus tissue extracts. Developed by the Khavinson group, it is promoted as a successor to Thymalin (a thymic extract used in Russian medicine since the 1970s). Like other Khavinson bioregulators, it lacks peer-reviewed clinical evidence meeting international standards. The concept of organ-specific peptide bioregulation remains unvalidated by Western medical science.
Category: Bioregulator / Immune. Evidence rating: F (anecdotal/unsupported).
Clinical status: No clinical trials in international registries. Available as a dietary supplement in Russia.
Kristagen is claimed to contain thymus-derived short peptides that regulate immune cell gene expression, promoting T-cell maturation and restoring thymic function in aging or immunocompromised individuals. The Khavinson framework proposes direct peptide-DNA interactions that modulate…
Safety considerations: No formal safety assessment by international regulatory agencies; Derived from animal thymus tissue; theoretical risk of infectious agent contamination; Reported as well-tolerated in Russian literature, but independently unverified.
Reviewed by the PeptideAtlas Editorial Team.
| Production method | bioactive |
|---|---|
| Anti-doping status | not-listed |
| US regulatory status | Not FDA-approved. Not recognized as a therapeutic. |
Thymalin is an older thymic peptide extract that has been used in Russian medicine since the 1970s. Kristagen is marketed as a refined, next-generation version of the same concept. Neither has credible international clinical evidence.
There is no credible evidence that Kristagen has any effect on immune function. All claims originate from the Khavinson group and have not been independently validated by international standards.
The study reporting lifespan extension with thymic bioregulators has significant methodological limitations, including lack of randomization, potential selection bias, and non-blinded assessment. It has not been replicated by any independent group.