Thymalin
Thymic Peptide Bioregulator · Immune Modulator
Natural peptide bioregulator from calf thymus gland, developed in the Soviet Union during the 1970s. Its mixture of thymic peptides supports immune restoration, anti-aging, and tissue regeneration. Decades of research have shown significant geroprotective effects: mortality rates fell up to 2-fold in studies, and 4-fold in combination with Epithalamin.
Overview
Natural peptide bioregulator from calf thymus gland, developed in the Soviet Union during the 1970s. Its mixture of thymic peptides supports immune restoration, anti-aging, and tissue regeneration. Decades of research have shown significant geroprotective effects: mortality rates fell up to 2-fold in studies, and 4-fold in combination with Epithalamin.
Behind the immunoprotective action are short peptides — KE, EW, EDP — that bind specifically to double-stranded DNA and to histone proteins, and so regulate gene expression. Differentiation and activity of T-lymphocytes are stimulated, CD4+ and CD8+ cells above all; cytokine regulation is promoted, antigen response enhanced, stem cell differentiation stimulated. Gerontogene activity and protein synthesis in the immune system are affected as well.
Research indications
What the compound has been studied for, grouped by body system. Effect size is the reported magnitude where it was measured — not a recommendation.
Differentiation and activity of T-lymphocytes are stimulated, restoring the immune system comprehensively.
Lymphocyte populations recover faster: CD4+ cells, CD3+HLA-DR+ cells, B-cells, NK-cells.
Incidence of acute respiratory disease among elderly patients falls 2.0–2.4 fold.
Across 6–8 years, mortality among treated elderly fell 2.0–2.1 fold in clinical studies.
Basic body functions are normalized; the cardiovascular, endocrine, immune and nervous systems improve.
Paired with Epithalamin across 6 years, mortality dropped 4.1 times against control.
Lymphopenia reverses faster in severe COVID-19 patients, as does recovery of immune markers.
Sarcoma studies observed arrest of tumor growth, and regression, in over half the animals.
Thymus function is normalized as aging proceeds.
- Class
- Polypeptide mixture
- Research status
- Well studied
- Typical dose
- 10 mg per injection
- Frequency
- Daily for 5–10 days, then break
- Cycle length
- 5–10 day cycles (short bioregulator protocol)
- Storage
- Reconstituted: 2-8°C refrigerated
Molecular data
- Type
- Polypeptide mixture
Dosing reference
Doses reported in the literature and by suppliers. These are a record of what has been used in research — reference, never instruction.
| Context | Route | Amount | Frequency |
|---|---|---|---|
| Immune restoration | IM or SubQ | 10 mg | Daily |
| Standard cycle | IM or SubQ | 10 mg | Daily for 5-10 days |
| Maintenance | IM or SubQ | 10 mg | 1-2x yearly cycles |
| With Epithalamin | IM or SubQ | 10 mg each | Annual cycles |
Interactions
Mortality reduction reached 4.1-fold in combination, against 2.0-fold for Thymalin on its own.
A frequent pairing, for systemic recovery and immune support alike.
Thymic origin is shared; the differing mechanisms can complement.
No negative interactions known; the mechanisms are separate.
What to expect
Safety
Mechanistic flags — properties of the pathway, not observed adverse events.
- Mild reactions where injected
- Side effects reported: practically none
- Signs of allergic reaction
- Unusual immune responses
- Pregnancy or breastfeeding
- Known hypersensitivity
- Autoimmune disease — caution warranted
- Recipients of an organ transplant, who need immunosuppression
Quality checklist
What to confirm before trusting a batch of research material. A verification aid — not an endorsement of any supplier.
- Third-party Certificate of AnalysisIndependent lab · dated · lot-matched.
- HPLC purity ≥ 98%Reverse-phase trace included.
- Mass-spec identity confirmedMALDI-TOF or ESI-MS.
- Counterion stated (acetate ≫ TFA)TFA salts can confound bioassays.
- Endotoxin / sterility statementRelevant once reconstituted.
- Lyophilised · cold-chain shippedStored −20 °C, shipped on ice.
- Labelled “research use only”No therapeutic or dosing claims.
Recorded signals for this compound · 7
- ✓Lyophilized powder, white to off-white
- ✓Solution clear once reconstituted
- ✓Vacuum seal intact
- !Slight clumping, dissolving readily
- ×Powder discolored
- ×Solution cloudy or with particles
- ×Seal broken
FAQ
How large is the mortality effect, and how solid is the human evidence?
Mortality fell 2.0–2.1 fold across 6–8 years of clinical study in elderly patients. Adding Epithalamin took that to 4.1 fold, which ranks among the most significant longevity effects on record for peptide bioregulators — though the design was observational rather than randomized.
Is severe COVID-19 prevented or reduced by Thymalin?
In severe COVID-19 patients, lymphopenia (low lymphocyte counts) reversed faster and recovery of CD4+, CD3+HLA-DR+, B-cells and NK-cells improved. It is no cure; immune recovery may be accelerated in immunocompromised COVID patients, which makes it relevant during severe cases.
Does 'Thymalin' name one preparation, or do formulations differ?
Thymalin is the standardized peptide extract mixture from calf thymus, its short peptides (KE, EW, EDP) working synergistically. Composition may vary slightly between manufacturers, but these core immunoactive peptide components appear in similar ratios in all authentic Thymalin.
What does Thymalin offer against a synthetic, more standardized Thymosin Alpha-1?
Thymalin is a natural extract, several synergistic peptide components in it; Thymosin Alpha-1 is one synthetic peptide on its own. That broader spectrum may yield geroprotective and antitumor effects, past the immune focus Thymosin Alpha-1 keeps to. Compatibility holds, and combining the two may enhance outcomes within comprehensive protocols.