Thymalin
Thymic Peptide · Thymus Extract · Thymalin Injectable
A thymus-derived peptide that restores immune function in ageing — the other half of Khavinson's longevity protocol.
Educational content only. Not medical advice. This compound may be regulated in your jurisdiction. Consult a healthcare professional.
01 What is Thymalin?
Thymalin is a peptide bioregulator extracted from the thymus gland, developed alongside Epithalon by Professor Khavinson in Russia. While Epithalon targets telomeres and the pineal gland, Thymalin targets the immune system — specifically the declining thymic function that is one of the defining features of immunosenescence (immune ageing). Your thymus gland — that weird organ behind your sternum — is responsible for training T-cells, the soldiers of your adaptive immune system. The problem is that your thymus starts shrinking (involuting) from puberty onwards. By age 60, it is mostly fat with minimal functional tissue. This thymic involution is why older people get more infections, respond poorly to vaccines, and develop more cancers. Thymalin aims to partially restore what ageing takes away. The famous Khavinson longevity study combined Thymalin with Epithalon in elderly patients and observed a 46% reduction in mortality over 12 years compared to controls. Whether this was primarily from immune restoration, telomerase activation, or the combination remains debated — but the result is striking enough to warrant attention.
02 How Does It Work?
Thymalin contains peptide fractions that mimic or restore thymic hormone activity. Proposed mechanisms: 1. Promotes T-cell maturation and differentiation — partially compensating for age-related thymic involution. 2. Restores CD4/CD8 T-cell ratios toward youthful patterns. 3. Enhances natural killer (NK) cell activity. 4. Modulates cytokine production — reducing the chronic low-grade inflammation (inflammageing) associated with immune decline. 5. Supports regulatory T-cell function — reducing autoimmune tendency. The net effect is a partial reset of immune parameters toward younger values.
03 What Does The Research Say?
Moderate evidence. Some human data, mostly animal studies.
Russian clinical data (extensive): Multiple studies in elderly populations showing restoration of immune parameters — improved T-cell counts, normalised CD4/CD8 ratios, enhanced vaccine responses, reduced infection rates. The mortality study: Combined Thymalin + Epithalon reduced mortality by 46% over 12 years in elderly patients (n=266, prospective, randomised). Published in Bulletin of Experimental Biology and Medicine, 2003. Western replication: Very limited. Interest is growing given the ageing population, but no major Western trials completed. The concept of thymic restoration is gaining mainstream traction though (regenerative medicine approaches to thymus).
04 Reported Dosages
Research literature dosages only. NOT medical recommendations. Always consult a healthcare professional.
Intramuscular or subcutaneous: 5-10mg daily for 5-10 day courses, repeated 1-2 times yearly. Some protocols use it in combination with Epithalon (alternating cycles or concurrent). Available from peptide suppliers as lyophilised powder. DISCLAIMER: Not approved outside Russia. All dosing based on Russian clinical research. Ensure peptide is third-party tested for purity and sterility.
05 Side Effects & Risks
Well-tolerated in Russian clinical use — minimal reported side effects beyond injection site reactions. Theoretical concerns: immune stimulation could theoretically exacerbate autoimmune conditions (though some evidence suggests it actually helps by restoring Treg function). Avoid in active autoimmune flare without specialist guidance.
06 Legal Status
Unregulated research peptide. Not approved as medication.
Research chemical. Not FDA-approved.
Approved medication in Russia. Research peptide in other EU countries.
Not TGA-approved. Research chemical.
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