Crystagen is one of the Cytogens, the synthetic short-peptide capsules from the Khavinson bioregulator programme. It is the tripeptide Glu-Asp-Pro (EDP), sold for “immune system support”, and usually bought by people already taking Thymalin-style products for immune aging.
The verdict is quick: Crystagen has less published research than almost any other bioregulator. What exists is cell and tissue work from the developer network, and none of it is in people.
For the class as a whole, see the peptide bioregulators overview.
At a Glance
| Property | Detail |
|---|---|
| Sequence | Glu-Asp-Pro (EDP), synthetic tripeptide (some vendors misprint it as Pro-Glu-Asp) |
| Origin | Khavinson group, St. Petersburg; Cytogen product line |
| Proposed mechanism | DNA binding and gene regulation in immune cells (modelling and rat tissue data) |
| Marketed for | Immune support, immune aging, recovery after infections |
| Route | Oral capsules (Cytogen), sublingual liquid; injectable research vials exist |
| Typical dose range | 1–2 capsules twice daily for 30 days (label); 1–2 mg SC daily for 10–20 days (practice, vials) |
| Evidence level | Limited: three small pre-clinical papers, no human data |
| Regulatory status | Sold as a food supplement; not an approved medicine (FDA, EMA); not named by WADA, falls under S0 |
How it works
The Khavinson group’s docking models place EDP on the same “agat” DNA motif as the thymus dipeptide Vilon (Lys-Glu) [1], which is their argument for an immune action. In a Russian study of aging rat spleen tissue, Crystagen activated B cells, but unlike Vilon and Thymogen it did not stimulate cell renewal in the old spleen [2]. In skin explants, the same tripeptide (tested as “T-36”) stimulated cell proliferation in tissue from young rats, while only a different tripeptide worked in tissue from old rats [3].
That is the whole mechanistic case. It is thin, and the old-tissue results are not encouraging for an anti-aging product.
What the evidence shows
Human studies
None on PubMed. I found no human trial, case series or pharmacokinetic study.
Animal and cell studies
| Study | Model | Finding |
|---|---|---|
| Chervyakova et al. 2014 [2] | Spleen tissue from aging rats | Activated B cells; no cell renewal in aging spleen |
| Voicekhovskaya et al. 2012 [3] | Skin explants, young and old rats | Proliferation up in young tissue only |
| Khavinson et al. 2016 [1] | Computer docking | Predicted DNA binding site shared with Vilon |
Dosing
For informational purposes only — this summarises doses used in research and practice; it is not a prescription or individual medical advice.
| Goal | Dose | Route | Frequency / timing | Cycle length | Basis |
|---|---|---|---|---|---|
| Prevention course | 1 capsule | Oral, with meals | Twice daily | 30 days, once or twice a year | Label (supplement directions, ipept.eu) |
| “Corrective” course alongside other treatment | 2 capsules | Oral, with meals | Two to three times daily | 30 days | Label (supplement directions, ipept.eu) |
| Standard Cytogen course (manufacturer site) | 1–2 capsules | Oral, with meals | Twice daily | 1 month, repeat after 3–6 months | Label (NPCRIZ Europe directions for the Cytogen line, e.g. Ovagen page) |
| Injectable research vial | 1–2 mg | SC injection | Once daily | 10–20 days, 1–3 courses a year | Practice protocol for the class (r/peptidebioregulators, ZyraTrack forum) |
| Common sequencing | Crystagen course, then the thymus extract Vladonix | Oral | As above | 1 month Cytogen, then Cytomax | Practice protocol (vendor advice; ipept.eu) |
How much peptide is in a capsule is unclear. The manufacturer’s European site states that 2–4 Cytogen capsules contain 0.2–0.4 mg of peptide complex, while some resellers state 10 mg per capsule, a 100-fold discrepancy. For injection technique, see the peptide injection guide.
What people report: what works and what doesn’t
Crystagen-specific reports are rare; it is usually one capsule in a multi-bioregulator routine.
Reported to work
- Some users of the immune bioregulators (mostly the thymus extract Vladonix) describe fewer seasonal allergy symptoms or colds over a season (r/Biohackers). These reports are not specific to Crystagen.
Mixed or unclear
- Whether a tripeptide survives digestion is argued both ways in the community (r/NooTopics); the Khavinson group’s own modelling suggests uptake through the PEPT1 transporter [4], but no one has measured blood levels.
Reported not to work / disappointing
- A recurring theme is that oral bioregulator courses produce nothing users can feel, and the cost adds up quickly (Steroidsgrabber forum).
A real trial would need a hard outcome, such as fewer respiratory infections or better vaccine responses than placebo.
Safety and side effects
- No human safety data.
- Autoimmune disease: anything sold as an immune stimulant is a theoretical concern in active autoimmune disease; untested.
- Recurrent infections need a work-up (immunoglobulins, lymphocyte subsets, HIV, diabetes, iron) rather than a supplement.
- Pregnancy: no data; avoid.
Legal and regulatory status
- US: not FDA-approved; sold as an imported supplement or research chemical without efficacy review.
- EU / Germany: not authorised as a medicine by the EMA or BfArM; supplement-style capsules need no proof of efficacy.
- Sport: not named on the WADA 2026 list; falls under S0.
How it fits
For immune aging, Thymosin Alpha-1 has randomised trials, Thymogen is a licensed drug in Russia, and Vilon has more pre-clinical work than Crystagen. Background: thymic involution and immune aging.
Related Articles
- Peptide Bioregulators: The Khavinson Protocol and What the Evidence Shows
- Thymic Involution and Immune Aging: Can Peptides Help?
- Thymosin Alpha-1: The Immune Modulator with Real Data
- Immune Modulation Overview
- Peptide Safety: What You Need to Know
Frequently asked questions
What is Crystagen?
Crystagen is a synthetic tripeptide, Glu-Asp-Pro (EDP), from the Khavinson bioregulator line, sold as Cytogen capsules and a sublingual liquid for the immune system.
Is there research on Crystagen?
Very little. PubMed has one Russian study in aging rat spleen tissue, one skin-explant study that tested the same tripeptide under a code name, and computer docking models. There are no human trials.
How do you take Crystagen capsules?
The supplement directions are 1 capsule twice daily with meals for 30 days for prevention, or 2 capsules two to three times daily for 30 days in a 'corrective' course, repeated after 3–6 months.
Is Crystagen the same as Thymalin or Vladonix?
No. Thymalin and Vladonix are natural thymus extracts. Crystagen is a single synthetic tripeptide.
Why do some sites list a different sequence?
Some vendors print Pro-Glu-Asp. The patent and most references give Glu-Asp-Pro; a reversed sequence would be a different molecule.
References
- Khavinson VK, Lin’kova NS, Tarnovskaya SI, et al. Short Peptides Regulate Gene Expression. Bull Exp Biol Med. 2016. https://pubmed.ncbi.nlm.nih.gov/27909961/
- Chervyakova NA, Linkova NS, Chalisova NI, et al. Molecular aspects of immunoprotective activity of peptides in spleen during the ageing process (in Russian). Adv Gerontol. 2014. https://pubmed.ncbi.nlm.nih.gov/28976144/
- Voicekhovskaya MA, Chalisova NI, Kontsevaya EA, et al. Effect of bioregulatory tripeptides on the culture of skin cells from young and old rats. Bull Exp Biol Med. 2012. https://pubmed.ncbi.nlm.nih.gov/22803085/
- Khavinson VK, Linkova NS, Rudskoy AI, et al. Feasibility of Transport of 26 Biologically Active Ultrashort Peptides via LAT and PEPT Family Transporters. Biomolecules. 2023. https://pubmed.ncbi.nlm.nih.gov/36979488/
Disclaimer: This article is for informational and educational purposes only and is not a prescription or individual medical advice. Crystagen is not approved by the FDA or the EMA.
