What is Thymalin sold for here?

This product is sold exclusively as a laboratory chemical for research, not as a medicinal product, and is not intended for use in humans or animals. In Russia and some CIS states, Thymalin has been used as an immune modulator; it holds no marketing authorization in the EU or internationally.

What exactly is Thymalin?

Thymalin is a peptide complex originally obtained through mild acid extraction from calf thymus. The later synthetically manufactured active component is the dipeptide Glu-Trp (L-glutamic acid-L-tryptophan), a very small peptide with preclinically reported immunomodulatory effects.

How are Thymalin's identity and purity confirmed?

Identity is verified by mass spectrometry (Glu-Trp), together with an HPLC purity result on the batch certificate. The report comes from Janoshik and is submitted by the manufacturer; current batch values are listed on our CoA page.

What is a "Bioregulator" according to Khavinson?

Bioregulatory peptides, according to Vladimir Khavinson's theory, are short peptides isolated from specific organs or manufactured synthetically that are thought to support the function of those organs. Thymalin is the bioregulator of the thymus, Epithalamin that of the pineal gland. The underlying epigenetic hypothesis originates from Khavinson's work and has not been broadly confirmed outside this group.

Is there independent confirmation of the longevity effects?

The existing long-term and mortality data come predominantly from Khavinson's own research group. Large-scale, independent international replications are largely lacking, which is why these effects should be regarded as preliminary.

How does Thymalin differ from Thymosin Alpha-1?

Thymosin Alpha-1 is a 28-amino-acid peptide from the thymus that is approved as an immune stimulant in some countries. Thymalin is based on the dipeptide Glu-Trp and belongs to the bioregulation hypothesis. They are different molecules with different regulatory status.

What dosages have been used in research?

In Khavinson's studies, Thymalin was administered cyclically, typically 10 mg daily over 5-10 days followed by breaks. In unvalidated community reports, similar magnitudes (around 5-10 mg per cycle day) are mentioned; these figures are self-reported and not a recommendation. There is no EU-approved treatment regimen for humans.

What side effects have been reported in research?

Systematic, independent international long-term safety data on Thymalin are not available, and no dedicated safety data exist for the research-grade material sold here; any statement about tolerability should be treated as preliminary.

How is Thymalin stored?

The lyophilized powder is stored at -20 °C. After reconstitution, it is kept refrigerated at 2-8 °C and protected from light. Without a batch-specific stability study, no fixed shelf life after reconstitution can be guaranteed; laboratory practice follows general discard conventions.

What is Thymalin reconstituted with?

Laboratory practice uses bacteriostatic water or physiological saline; swirl gently, do not shake. This does not constitute validated compatibility or stability with Thymalin; the protocol should specify a suitable, validated solvent.

Can Thymalin be combined with other peptides?

In Khavinson's research, Thymalin was frequently combined with Epithalamin; a defined added benefit of combination over the individual substances has not been independently confirmed outside this group. Other peptides address different endpoints and can be studied as a complement in research protocols.

Is Thymalin an approved medication?

Thymalin holds no marketing authorization as a medicinal product in the EU or internationally. In Russia and some CIS states, it has been used clinically. Here, it is sold exclusively as a research chemical.

Is buying Thymalin for research legal in the EU?

There is no uniform EU-wide category for research peptides; the legal situation depends on presentation, intended use, and the national law of the respective member state. We sell exclusively for laboratory research and not for human consumption. Check the rules with your national competent authority and your institution, seek qualified legal advice if needed, and treat this as general information, not legal advice.

How quickly is Thymalin delivered?

Shipping is from the EU with tracking, typically taking one to two business days within Germany and up to four business days in the rest of the EU. Current transit times, countries, and conditions are listed on our shipping page.

Buy Thymalin: Thymus Peptide for Longevity Research

Q: What did the 2003 Khavinson-Morozov study show?

This long-term observational study (Neuroendocrinology Letters 2003) reported mortality roughly half that of the control group in 266 elderly individuals over 6-8 years (the authors report a 2.0-2.1-fold reduction for Thymalin), along with improvements in immune and cardiovascular parameters. Important: the results come from Khavinson's own research group and have not been independently replicated internationally.

Q: What did the animal study by Anisimov et al. show?

Anisimov et al. (2001) examined synthetic thymic and pineal peptides in female CBA mice and reported, among other findings, a reduced spontaneous tumor incidence. These are preclinical findings from an animal model and not evidence of an effect in humans.

Thymalin is a peptide that has been studied for decades in Russian bioregulation research. Developed in the 1970s by Vladimir Khavinson at the Saint Petersburg Institute of Bioregulation and Gerontology, it has been investigated for decades for immune modulation and aging. Part of the data comes from clinical observational studies spanning 6-8 years, predominantly from Khavinson's own research group; independent international replications are largely lacking.

Thymalinlongevity

Thymus-derived immune peptide developed by Prof. Khavinson. Restores T-cell function and thymic activity that naturally decline with age. Over 40 years of clinical use in Russia for immune support and anti-aging research.

What is Thymalin?

Thymalin is a peptide complex originally obtained through mild acid extraction from calf thymus. The active component, later produced synthetically, is the dipeptide Glu-Trp (L-glutamic acid-L-tryptophan), a very small peptide with preclinically reported immunomodulatory effects.

The thymus is the central gland of the adaptive immune system. It is responsible for the maturation and selection of T lymphocytes. As we age, the thymus shrinks (thymic involution), a process that already begins during puberty and is linked to age-related immune decline (immunosenescence). Thymalin is studied preclinically in relation to this process.

The idea behind Khavinson's bioregulation theory: peptides isolated from specific organs are thought to support the function of those organs, among other things through a postulated effect on gene expression. This epigenetic hypothesis originates from Khavinson's work and has not been broadly confirmed outside this group.

Why is Thymalin studied?

Key studies

Khavinson and Morozov (2003, Neuroendocrinology Letters 24(3-4):233-240): This long-term observational study examined the geroprotective effects of Thymalin and Epithalamin (pineal gland peptide) in 266 elderly individuals over 6-8 years; the peptides were administered during the first 2-3 years. The authors reported mortality roughly half that of the control group (the authors report a 2.0-2.1-fold reduction for Thymalin), along with improvements in immune, endocrine, and cardiovascular parameters. Important: these results come from Khavinson's own research group and have not been independently replicated internationally.

Anisimov et al. (2001, Mechanisms of Ageing and Development 122(1):41-68): This animal study examined the effect of synthetic thymic and pineal peptides on biomarkers of aging, survival rates, and spontaneous tumor incidence in female CBA mice, and reported, among other findings, a reduced spontaneous tumor incidence. Such preclinical lifespan findings come from animal models and are not evidence of an effect in humans.

Khavinson et al. (1998, Journal of Neuroimmunology): This article described the isolation of the immunomodulatory dipeptide Glu-Trp from Thymalin using RP-HPLC and its action as an immune corrector in pharmaceutical practice.

Mechanisms of action

Several immunological mechanisms have been described in preclinical investigations:

T-cell differentiation: In cell and animal models, Thymalin was associated with promoted maturation and differentiation of T lymphocytes in the thymus, including the CD4+ (T-helper) and CD8+ (cytotoxic T-cell) populations.
Postulated epigenetic effect: According to Khavinson's bioregulation theory, Thymalin is thought to act at the chromatin level and influence the expression of age-dependently regulated genes. This is a hypothesis originating from this research group and has not been broadly confirmed outside it.
Cytokine modulation: In animal models, Thymalin influenced the balance of pro- and anti-inflammatory cytokines. In aged organisms, this balance typically shifts toward chronic inflammation ("inflammaging"); in animal models, this shift was partially attenuated.
Thymus function: Effects on markers of thymus function and involution have been reported in animal models; this does not constitute evidence of a clinical effect.
Pineal-thymus axis: Khavinson's work describes a connection between the thymus and the pineal gland. In the (not independently replicated) long-term studies, the combination of Thymalin and Epithalamin was reported to have a stronger effect than the individual peptides.

Quality criteria when buying

HPLC purity: The purity value for the respective batch is stated on the Certificate of Analysis (see CoA page).
Mass spectrometry: Confirmation of Glu-Trp identity.
Batch certificate: Every batch at PeptidesDirect comes with a Janoshik lab report (submitted by the manufacturer).
Synthetic vs. natural: Research-grade Thymalin is manufactured synthetically rather than extracted from animal tissue, which makes for more consistent batch quality.

Dosages in the research literature

Clinical studies (Khavinson): In the long-term studies, Thymalin was administered in cycles, typically 10 mg daily over 5-10 days, followed by breaks of several months. This cyclic approach is characteristic of bioregulation therapy.

Animal models: Anisimov et al. used various dosing schedules in mice, including long-term cycles spanning months.

Community reports: In unvalidated anecdotal reports, amounts on the order of 5-10 mg over short cycles of 5-10 days are mentioned; these figures are self-reported and not a recommendation.

The study figures come from the published literature; the community figures are unvalidated self-reports. None of these figures constitutes a dosing recommendation, and there is no EU-approved treatment regimen for humans.

Storage

Thymalin is supplied as a lyophilized powder:

Before reconstitution: Store at -20 °C.
After reconstitution: Store refrigerated at 2-8 °C. Without a batch-specific stability study, no fixed shelf life can be guaranteed; laboratory practice follows general discard conventions.
Reconstitution: Laboratory practice uses bacteriostatic water or physiological saline; swirl gently. This does not constitute validated compatibility, and the protocol should specify a suitable solvent.
Handling: Store protected from light; avoid repeated freeze-thaw cycles.

Why buy Thymalin from PeptidesDirect?

Batch certificate: Janoshik lab report (submitted by the manufacturer) for every batch.
Synthetic quality: consistent batch quality through synthetic manufacturing.
EU shipping: No customs or import fees on deliveries within the EU customs territory; delivery typically takes one to two business days within Germany and up to four business days in the rest of the EU, with tracking.
Current price: see product card above.