Reviewed by the PeptideMind Team · Updated August 5, 2026

Thymogen Dosage Guide, Benefits & Side Effects

Thymogen (Glu-Trp) dosage guide: injection protocols, T-cell and immune recovery benefits, and side effects of this Russian thymic dipeptide.

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Thymogen Dosage Schedule

A focused twenty day course that helps the immune system mature and function better, useful when immune defenses need extra support. Also studied for its role in healthy aging.

Thymogen for Immune Recovery

3 weeks split across multiple phases, focused on immune function.

Daily dosing

Taken daily.

100 mcg per injection

100 mcg per injection, given just under the skin in the abdomen or thigh.

Thymogen is a very small peptide that helps the immune system mature and work better. It's used to support immune recovery, especially when someone's immune system is weakened, and is also studied for anti-aging benefits.

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What is Thymogen?

Thymogen is a very short, lab-made peptide developed from thymus gland research to support and rebalance the immune system. It works by helping immune cells (T-cells) mature and function properly. It's an approved medication in Russia, available as both a nasal spray and injection, used clinically for immune dysfunction, recovery after surgery, and age-related immune decline.

Longevity

Research targets include cellular aging, senescence, and long-term healthspan.

Immunity

Research targets include immune cell activity, inflammatory response, and infection defense.

Immunity

thym

Immunity

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What Does Thymogen Do?

It attaches to receptors on immune cells and sets off an internal chain reaction that shifts the balance of certain signaling chemicals inside the cell, prompting immune cells to mature, activate, and produce the right infection-fighting signals. It also influences genes involved in how those cells grow, survive, and respond to stress.

Binds immune cell receptors

Attaches to receptors on immune cells.

Shifts internal signaling

Sets off a chain reaction that shifts key internal signaling chemicals.

Matures immune cells

Prompts immune cells to mature, activate, and produce the right signals.

Frequently Asked Questions About Thymogen

Straight answers on reconstitution, dosing, and safety, everything you need to research with confidence. For research reference only.

Thymogen is the common name for the synthetic dipeptide L-glutamyl-L-tryptophan (Glu-Trp, abbreviated EW), developed in Russia in the 1970s by Vladimir Khavinson's group at the Institute of Molecular Biology. It was isolated as the principal low-molecular-weight active component of Thymalin, a bovine thymic extract, and has been registered in Russia since 1990 as an immunomodulator in injectable, intranasal spray, and topical cream formulations. It has not been evaluated or approved by the FDA, EMA, or other Western regulatory agencies, and outside Russia it is sold only as a research chemical, not for human consumption.

Thymogen is reported to act on thymic epithelial cells to stimulate production of thymic serum factor (thymulin), promote T-lymphocyte differentiation and maturation (markers such as CD3, CD4, CD8), help normalize the Th1/Th2 cytokine balance, and support natural killer (NK) cell activity. It is also studied for effects on gene expression, heat-shock protein synthesis, and cell proliferation/apoptosis regulation. Most of this evidence comes from Russian-language clinical literature and animal studies rather than large Western trials, so the mechanism should be considered plausible but not conclusively established by international standards.

Published research and vendor protocols generally describe subcutaneous or intramuscular injection at 10-100 mcg per dose, given 1-3 times weekly, often calculated at roughly 0.3-0.8 mcg/kg body weight. Some formulations are used as an intranasal spray at approved clinical doses in Russia, and oral/capsule versions (sometimes marketed as "Thymogen Alpha-1") are dosed at around 10-20 mg per day. Because dosing conventions vary widely by source and none are backed by FDA-reviewed labeling, any figures found online should be treated as informal research protocols, not medical dosing guidance.

Lyophilized (freeze-dried) Thymogen is commonly reconstituted with bacteriostatic or sterile water, typically 1-2 mL per vial, yielding a concentration in the low mg/mL range. Once reconstituted, it is generally recommended to keep the solution refrigerated at 2-8°C (36-46°F) and use it within roughly 2-4 weeks, as peptide stability declines over time at room temperature. Unreconstituted lyophilized powder is usually stored frozen or refrigerated, protected from light, until use.

Available literature describes Thymogen as generally well tolerated, with side effects reported as rare and mild when they occur — mainly local injection-site reactions (redness, irritation) or transient nasal irritation with intranasal use. However, long-term human safety data outside supervised clinical or research settings is limited, and independent Western toxicology studies are sparse, so the absence of major reported side effects should not be read as proof of long-term safety.

Thymosin Alpha-1 is a distinct, well-characterized 28-amino-acid peptide with regulatory approval in over 30 countries and a large international evidence base. Thymalin is a complex bovine thymic extract containing multiple peptide fractions, including the dipeptides Thymogen (Glu-Trp) and Vilon (Lys-Glu). Thymogen itself is a single, simple dipeptide isolated as one of Thymalin's key active fragments, studied on its own for immune modulation and, in some research, neuroprotective and anti-aging effects. These are related but chemically and regulatorily distinct substances, and results for one should not be assumed to apply to the others.

Thymogen is an approved pharmaceutical in Russia but has not been approved by the FDA or other Western drug agencies for any indication. In the US and most other countries it is sold by peptide vendors labeled 'for research use only, not for human consumption,' meaning it is not sold or intended as a dietary supplement or medication. Buyers should be aware that research-use peptides are not subject to the manufacturing, purity, or safety oversight that applies to approved drugs.

Yes. Thymogen's mirror-image D-enantiomer (D-Glu-D-Trp) is marketed separately as Thymodepressin and is reported to have the opposite biological effect — immunosuppressive rather than immunostimulatory. This is cited in the literature as a notable example of reciprocal chiral pharmacology, and it underscores that stereochemistry matters a great deal for this peptide's activity; the L-form (Thymogen) and D-form (Thymodepressin) are not interchangeable.

Thymogen Reconstitution Guide

Thymogen is supplied as a freeze-dried powder that must be mixed into a injectable solution before use. Available in 10mg, 20mg sizes.

1 mg lyophilized vial

Thymogen is supplied as a freeze-dried powder that must be mixed into a injectable solution before use. Available in 10mg, 20mg sizes.

1 mL bacteriostatic water

Adding 1 mL of bac water to a 1 mg vial gives a workable concentration for syringe dosing. More water makes microdosing easier; less concentrates each draw.

Storage after mixing

The dry powder can sit at room temperature for up to three years. Once mixed with liquid, refrigerate and use within about a month. After reconstitution, keep the vial refrigerated and use within 30 days.

Reconstitution steps

Remove caps & sanitize stoppers

Attach needle to syringe

Draw 1 mL bacteriostatic water

Insert needle into Thymogen vial

Release water gently down the side

Swirl to dissolve — don't shake

Check for full dissolution

Refrigerate Thymogen — good for 30 days

Chemical Makeup

Amino Acids

Thymogen

Glu

Position 1

Trp

Position 2

Amino acid sequence

Glutamic acidPosition 1

TryptophanPosition 2

What Are the Benefits of Thymogen?

What research says it may help with, and how it works in the body.

immune support

: It activates the maturing of T-cells and helps normalize the levels of several key immune cell types.
: It stimulates the body to produce more of several types of antibodies that help fight infection.
: It has been studied for helping patients recover better after surgery by supporting their immune system.
: It helps balance both major arms of the immune system: the antibody-based response and the cell-based response.

antiaging research

: In aging research, it has shown protective effects that may help slow age-related decline.
: In research, it has helped prevent cancers from forming on their own and has shown strong effects against existing tumors.
: When combined with peptides from the pineal gland, it meaningfully extended average lifespan in animal studies.

clinical research areas

: It has been studied in Russia for helping regulate the immune system in cancer patients.
: Researchers have shown interest in its potential uses for heart and blood vessel health.
: It has been studied for its effects on both metabolism and immune function in diabetes.

What Are the Side Effects of Thymogen?

Who should avoid it, warning signs to watch for, and what to know before combining it with other compounds.

Who Should Avoid It

: Active autoimmune diseases (use with caution)
: Organ transplant recipients on immunosuppression
: Known hypersensitivity to component amino acids
: Pregnancy or breastfeeding

Stop Right Away If You Notice

: Signs of allergic reaction
: Unusual immune symptoms
: Severe injection site reactions

Milder Signs to Watch For

Discolored powderCloudy or particulate solutionDamaged packaging or broken seal

Was it helpful?Yes

Is Thymogen FDA approved?

Thymogen is not an FDA-approved drug. It is intended for research purposes only and is not approved for human consumption, diagnostic, or therapeutic use.

Research Use Only

Thymogen has not been evaluated by the FDA for safety or efficacy in humans.

No Clinical Oversight

Not manufactured under FDA-regulated quality or clinical standards.

Unregulated Sourcing

Purity, dosing, and sourcing are not verified through FDA testing or oversight.

A smartphone screen displaying FDA status for a drug, indicating "FDA approved drug: No" and "Classification: Research use only." A banner notes "Research Only" with the disclaimer "not for human use," emphasizing its intended use for laboratory and analytical purposes.

Thymogen Cycle Length: How Long Should It Last?

This breaks down how long a typical Thymogen cycle runs and what research suggests happens at each stage. Research shows that staying on a peptide continuously, without a break, may make it less effective over time.

That's why most research protocols build in a break between cycles, often called a washout period, to let the body reset before starting again.

Week 0-0: Rapid tissue distribution to thymus, lymph nodes, liver, kidneys
Day 1-10: T-cell activation and differentiation begins
Week 0-0: Immunoglobulin production stimulated; immune markers improve
Week 0-0: Effects persist due to cellular and epigenetic changes
Week 0-0: Cumulative geroprotective benefits with regular cycling

Thymogen Research References

It is an approved compound

4Research references

Thymogen

Thymogen is an approved compound

Immunomodulatory synthetic dipeptide L-Glu-L-Trp slows down aging and inhibits spontaneous carcinogenesis in rats

Thymogen demonstrated geroprotector activity and inhibited spontaneous carcinogenesis in aging rat models.

n.d.

Natural and synthetic thymic peptides as therapeutics for immune dysfunction

Review of thymic peptide therapeutics including Thymogen for immune modulation.

n.d.

Peptide Bioregulators from Thymus and Pineal Gland

Significant lifespan increases and antitumor activity with combined Thymogen and Epitalon treatment.

n.d.

Short Peptides Regulate Gene Expression: Thymogen (EW) DNA Docking to AACG Sequence

Khavinson, Lin'kova & Tarnovskaya (Bull Exp Biol Med, 2016) used molecular docking (MOE 2012, Amber99 force field, B-form DNA) to model interactions between 19 short bioregulator peptides and 4-bp DNA duplexes. For the dipeptide Thymogen (Glu-Trp, listed as 'EW'), the predicted DNA-binding sequence was AACG, with the weakest binding-strength rating (+) of the set. This is an in silico docking prediction of a peptide-DNA complementarity hypothesis, not a demonstrated biological mechanism; the same paper does not address T-cell differentiation or cyclic-nucleotide modulation for Thymogen (those claims are covered separately by refs 326/327, Anisimov 2000 and Morozov 1997).

n.d.

Thymogen Dosage Guide, Benefits & Side Effects

Thymogen Dosage Schedule

What is Thymogen?

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What Does Thymogen Do?

Frequently Asked Questions About Thymogen

What is Thymogen?

How does Thymogen work?

How is Thymogen typically dosed in research protocols?

How should Thymogen be reconstituted and stored?

What side effects are reported with Thymogen?

How is Thymogen different from Thymalin, Thymosin Alpha-1, or Vilon?

Is Thymogen legal to buy, and is it approved for human use?

Is there a D-enantiomer form, and does it behave differently?

Thymogen Reconstitution Guide

Chemical Makeup

What Are the Benefits of Thymogen?

immune support

antiaging research

clinical research areas

What Are the Side Effects of Thymogen?

Who Should Avoid It

Stop Right Away If You Notice

Milder Signs to Watch For

Is Thymogen FDA approved?

Thymogen Cycle Length: How Long Should It Last?

Thymogen Research References

Thymogen Dosage Guide, Benefits & Side Effects

Thymogen Dosage Schedule

What is Thymogen?

Our top-rated vendor

What Does Thymogen Do?

Thymogen Targeted areas

Frequently Asked Questions About Thymogen

What is Thymogen?

How does Thymogen work?

How is Thymogen typically dosed in research protocols?

How should Thymogen be reconstituted and stored?

What side effects are reported with Thymogen?

How is Thymogen different from Thymalin, Thymosin Alpha-1, or Vilon?

Is Thymogen legal to buy, and is it approved for human use?

Is there a D-enantiomer form, and does it behave differently?

Thymogen Reconstitution Guide

Chemical Makeup

What Are the Benefits of Thymogen?

immune support

antiaging research

clinical research areas

What Are the Side Effects of Thymogen?

Who Should Avoid It

Stop Right Away If You Notice

Milder Signs to Watch For

Is Thymogen FDA approved?

Thymogen Cycle Length: How Long Should It Last?

Thymogen Research References

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