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Thymalin (Thymic Peptide Complex)
Also known as: Thymaline, Thymic Factor, Timalin
Confidence
Updated 2026-03-18
Thymalin is a polypeptide complex extracted from calf thymus glands, developed at the St. Petersburg Institute of Bioregulation and Gerontology by Dr. Vladimir Khavinson. It is approved in Russia as an immunomodulator and is part of Khavinson's broader bioregulatory peptide research program (alongside Epithalon). It is theorized to restore thymic function and immune competence, particularly in aging and immunocompromised patients.
Class
Immune Modulator (Thymic Peptide)
Routes
Intramuscular, Subcutaneous
Half-Life
Not formally established (complex mixture).
Thymalin contains a mixture of thymic peptides that regulate T-cell maturation and differentiation. It promotes CD4+/CD8+ T-cell balance, enhances natural killer cell activity, modulates cytokine production (increasing IL-2, IFN-gamma while regulating TNF-alpha), and supports thymic involution reversal in aging. It is proposed to restore neuroimmune-endocrine axis function through thymic peptide signaling.
Half-Life
Not formally established (complex mixture).
Bioavailability
IM: assumed high for peptide mixture. Not orally bioavailable.
Approved (Russia): Secondary immunodeficiency, adjunct in chronic infections, post-surgical immune recovery, radiation/chemotherapy immune support. Research: aging-related immune decline, immune optimization.
Published clinical data primarily in Russian medical literature. Khavinson's longitudinal study (20+ years) in elderly patients reported improved immune markers and reduced mortality. Russian clinical guidelines include thymalin for immune support. Western peer-reviewed data is very limited. A few studies in European journals show improved T-cell subsets in elderly patients. Overall evidence quality by Western standards is low — primarily observational with limited placebo-controlled data.
Human Studies
20
Animal Studies
30
Reported as well-tolerated in Russian clinical practice. Injection site reactions. Rare allergic reactions (animal-derived product). Theoretical risk of prion contamination from bovine thymus tissue — modern manufacturing includes purification steps. Immunostimulation caution in autoimmune disease.
Approved in Russia. Not approved by FDA, EMA, or other Western agencies. Part of the Khavinson bioregulatory peptide program alongside Epithalon. Available through Russian pharmacies and international peptide suppliers.
Drug Interactions: Caution with immunosuppressants (may counteract effects). May enhance immune checkpoint inhibitor activity (theoretical). Monitoring: Immune cell panels (CD4, CD8, NK cells), immune function markers. Research Gaps: No Western RCTs. Animal-derived product purity concerns. Mechanism of individual active peptides not characterized. Khavinson research needs independent Western replication.
Intramuscular (Russian protocol)
Common Range
5–10 mg/day
Timing
Any time
Frequency
Daily for 3–10 days
Cycling
3–10 day courses, repeated 1–6 months apart as needed
Reconstitution
Reconstitute lyophilized powder with 1–2 mL saline
Storage
Refrigerated
Important Note
NOT FDA-approved. Approved in Russia. Animal-derived product. Russian dosing protocols. Research context only for Western use.
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Immune Modulator
Thymosin alpha-1 is a 28-amino acid peptide originally isolated from thymic tissue. It is approved in over 35 countries (not the US) under the brand name Zadaxin for immune modulation in hepatitis B and as an adjunct to chemotherapy. It represents a unique case in peptide regulation — internationally validated but caught in US regulatory limbo.
Anti-Aging
Epitalon is a synthetic tetrapeptide (Ala-Glu-Asp-Gly) studied primarily by Russian researcher Professor Vladimir Khavinson for its potential telomerase-activating and anti-aging properties. It is one of the more speculative peptides in the longevity space, with most data coming from Russian research institutions.
Disclaimer: This content is for educational and informational purposes only and does not constitute medical advice. Always consult with a licensed healthcare provider before starting, stopping, or modifying any peptide therapy. PeptideSupplierMatch does not prescribe, sell, or distribute peptides.
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