Thymogen: what it is and what the evidence says
An immunomodulatory dipeptide derived from research on thymus extracts.
Last reviewed: August 16, 2026 · How we verify this
The ground it plays on
The immune system is not something you turn "up" or "down": it is regulated. A compound that raised the response without control would be a problem, not a benefit, which is why the correct word is modulation. For people with autoimmune or inflammatory conditions, this stops being a technical nuance.
What it is studied for
Advertised for immune modulation.
There is a distinction that almost always gets lost. A compound being studied for something is not the same as achieving it. And even where it works in a dish or in a mouse, that says little about whether it works in a person or whether the benefit is worth the risk. The section below therefore carries more weight than everything above it.
What the human evidence says
There is a 2011 Russian trial, double-blind, randomized, and placebo-controlled, in older adults before abdominal surgery for tumors, with recovery of cellular immunity and fewer postoperative complications. Under the code IM862 it was tested in the United States against Kaposi sarcoma, and the phase 3 trial, with 202 patients, did not outperform placebo.
The limitation that matters most
The Russian trial is small, single-center, published in Russian, and not yet repeated at other centers. Broad, registered trials for its immune uses are missing, and the rest of what is known is Russian series without a detailed design and studies in cells and rats.
Regulatory status
Medication registered in Russia as an immunomodulator, authorized in the USSR in 1990, as a nasal spray, injectable solution, and cream. Not approved by the FDA or the EMA. It is not listed by name on the WADA 2026 Prohibited List.
Status can change and varies by country. Always verify the rules in force where you live before drawing conclusions.
Cautions and context
It has a real randomized trial, but a small, single-center one that has never been replicated outside Russia.
With infections that keep recurring, the cause is studied first with a doctor, and before surgery, chemotherapy, pregnancy, or breastfeeding the decision belongs to the treating team.
What this page cannot give you
A reference page can take you this far. You know what Thymogen is and where its research stands, which already puts you ahead of most readers. Four questions remain that no encyclopedia can answer for you, because the answers depend on your own situation:
- What would you measure beforehand, so that later you could tell whether anything actually changed?
- What would you watch along the way, and how consistently?
- What would you ask a professional, and in how much detail, so you do not walk out with a textbook answer?
- What would make you stop?
That is what the course is for
PeptiXtreme is ${CIF.LECCIONES} lessons that hand out no numbers. Each one ends with your starting point, what to watch along the way, the specific questions you take to a professional and the signals that mean stop. It includes per-module exams, a Certificate of Completion with a verifiable certificate ID, a Progress Tracker to follow how you are doing, and a human advisor you can actually write to.
See the course → Or measure your judgment, freeReferences
Every entry links to its record on PubMed, the US National Library of Medicine database. Open them and check. We would rather have a reader who verifies than one who takes our word for it.
- [Application thymogen for preoperative preparation of elderly patients with tumor processes in abdominal cavity]human Adv Gerontol · 2011 · PMID 21957588 →
- The First Reciprocal Activities of Chiral Peptide Pharmaceuticals: Thymogen and Thymodepressin, as Examplesreview Int J Mol Sci · 2024 · PMID 38732260 →
- Hepatoprotective Effects of Thymogen Analogues in Hydrazine Hepatopathy in Ratspreclinical Bull Exp Biol Med · 2025 · PMID 40442470 →
- Reparative and Antioxidant Effects of New Analogues of Immunomodulator Thymogen in Experimental Model of Liver Damagepreclinical Bull Exp Biol Med · 2023 · PMID 37861903 →
- [Peptide bioregulators: the new class of geroprotectors. Message 2. Clinical studies results]review Adv Gerontol · 2013 · PMID 24003726 →
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Frequently asked questions
What is Thymogen?
An immunomodulatory dipeptide derived from research on thymus extracts. It is studied within the area of immune.
Is there human evidence for Thymogen?
There is a 2011 Russian trial, double-blind, randomized, and placebo-controlled, in older adults before abdominal surgery for tumors, with recovery of cellular immunity and fewer postoperative complications. Under the code IM862 it was tested in the United States against Kaposi sarcoma, and the phase 3 trial, with 202 patients, did not outperform placebo.
Is it approved by any health agency?
Medication registered in Russia as an immunomodulator, authorized in the USSR in 1990, as a nasal spray, injectable solution, and cream. Not approved by the FDA or the EMA. It is not listed by name on the WADA 2026 Prohibited List.
What is the dose of Thymogen?
We do not publish dosages. This is not an oversight. No single figure works for everyone: the regimen depends on a person's medical history, on whatever medication they already take, and on the goal they are chasing, which is something a professional weighs with the case in front of them. What you can build is the ability to walk into that appointment knowing what to ask.
Where can I learn to evaluate this properly?
This page tells you what Thymogen is and what the evidence says. The PeptiXtreme course teaches the other half: what you would measure before considering anything, what you would watch, the specific questions you would take to a professional and when you would stop.