Crystagen
A synthetic Khavinson tripeptide (Glu-Asp-Pro) researched as a thymic-tissue bioregulator for T-cell function and immune regulation.
Crystagen is a synthetic tripeptide from the Khavinson bioregulator family, defined by the sequence Glu-Asp-Pro. It is positioned as the synthesized, single-sequence complement to Thymalin (a polypeptide thymic extract), targeting thymic tissue, T-cell maturation, and immune regulation. Preclinical work from the Khavinson group reports effects on T-cell function markers and lymphocyte populations, but independent replication is limited and no FDA-grade clinical trials have been conducted. It is not approved by the FDA, EMA, or any major Western regulator and is sold as a research-use-only compound.
Class
Synthetic tripeptide (Khavinson bioregulator)
Routes
Subcutaneous injection (research use)
Category
Longevity & Bioregulators
Researched benefits
What it's studied for
Thymic bioregulation
Proposed to enter thymic-tissue cell nuclei and modulate gene expression in pathways related to thymic function and T-cell maturation. Evidence is preclinical (cell culture and rodent), primarily from the Khavinson group.
T-cell function support
Preclinical studies have reported effects on T-cell function markers and lymphocyte populations, consistent with its positioning as an immune-targeted bioregulator.
Immune regulation
Reported to influence immune regulation parameters in cell culture and rodent models, overlapping functionally with Thymalin but acting as a defined single-sequence tripeptide rather than a multi-component extract.
Mechanism
How it works
Crystagen is a synthetic Glu-Asp-Pro tripeptide proposed to act as a peptide bioregulator: short peptides in the Khavinson framework are thought to enter cell nuclei and modulate gene expression in a tissue-targeted fashion. For Crystagen, the proposed target is thymic tissue, with downstream effects on T-cell maturation, immune regulation, and thymic function.
Within the Khavinson family, Crystagen is the synthesized single-sequence complement to Thymalin, the polypeptide thymic extract. Both target immune function, but through different molecular forms — Crystagen as a defined tripeptide that is standardizable and easy to characterize, Thymalin as a multi-component bovine-thymus extract with a longer Russian clinical-use track record.
Crystagen sits in the immune-targeting subset of Khavinson bioregulators alongside Thymalin (polypeptide extract) and Vilon (Lys-Glu dipeptide), with the three compounds proposed to act on overlapping but distinct aspects of immune function. The molecular details of nuclear entry and gene-expression modulation remain largely characterized in Khavinson-group preclinical work, with limited independent replication.
Combinations
Stacking & blends
Thymic immune stack
Broader thymic and immune support
Human research in Russian contexts has combined Crystagen with Thymalin and other immune-targeted bioregulators; Crystagen provides a defined single-sequence tripeptide while Thymalin contributes a multi-component thymic extract.
Khavinson immune trio
Layered immune regulation
Crystagen, Thymalin, and Vilon are the immune-targeting subset of the Khavinson family, proposed to act on overlapping but distinct aspects of immune function.
Safety
Side effects & considerations
Commonly reported effects
Contraindications & cautions
- Not approved for human use; use outside research settings is not advised
Side effects in available preclinical data and community-reported research use are mild, with injection-site reactions the most common report. Long-term safety in humans at sustained research-use dosing is not characterized at Western clinical standards.
FAQ
Crystagen — common questions
What does Crystagen do?
It is proposed to act on thymic and T-cell function through epigenetic gene-expression modulation, with preclinical research focused on immune regulation markers. Human Phase 2/3 efficacy is not established at Western clinical standards.
How does Crystagen differ from Thymalin?
Crystagen is a synthesized single-sequence tripeptide (Glu-Asp-Pro); Thymalin is a polypeptide extract from bovine thymus tissue containing multiple constituent peptides. Crystagen is more standardizable and easier to characterize, while Thymalin has Russian clinical-practice approval and a longer human-use track record.
Is Crystagen legal to purchase?
It is legal to purchase as a research chemical for laboratory use in most jurisdictions, but it is not approved for human consumption in the US, EU, or most Western markets.
Will Crystagen be FDA-approved?
No active FDA approval pathway exists for Crystagen as of 2026.
How can I verify a Crystagen vendor is selling real product?
Look for an independent third-party HPLC certificate of analysis from a lab the vendor does not own or pay, with mass spectrometry identity confirmation to distinguish it from related Khavinson tripeptides.
Is there a recommended Crystagen dose?
No. Crystagen is not approved for human consumption in Western jurisdictions, and standardized human dosing has not been established. Anyone considering use should consult a licensed physician.
