Recovery ⏱ Half-life: Variable — polypeptide complex with multiple active components. Approved Abroad

Thymalin

Thymalin (Thymus Extract)

Updated March 15, 2026

Evidence at a Glance

Regulatory statusApproved Abroad
Registered for medical use in Russia since the 1980s (Khavinson group); not FDA-approved.
Human evidenceLimited
Animal evidenceModerate

Thymalin is a thymus-extract peptide mixture approved and used in Russia as an immunomodulator, but its human data come almost entirely from small, single-group studies that have not been independently replicated at Western standards.

What the research does not support

  • It is not FDA-approved and has no large, independent Western clinical trials.
  • It is a crude peptide mixture, not a single defined molecule, so composition and potency vary between preparations.
  • It has not been proven to extend human lifespan despite long-term observational claims from its originating group.
  • Evidence for the broad 'anti-aging' or 'rejuvenation' benefits often marketed is weak and largely preclinical.
Half-Life
Variable — polypeptide complex with multiple active components.
Mol. Weight
Complex mixture

What is Thymalin?

Thymalin represents the traditional approach to thymic peptide therapy — a complex of bioactive peptides extracted from thymus tissue that restore and normalize immune function, particularly T-cell mediated immunity.

Research Applications

Immune restoration, age-related immune decline, post-surgical recovery, chronic infection support, and T-cell function normalization.

Dosage Information (Research Use)

Clinical protocols: 5-10 mg intramuscularly daily for 5-10 day courses, repeated 1-4 times annually. Research use only.

Reconstitution & Handling

Reconstitute with provided saline or BAC water.

Half-Life & Pharmacokinetics

Variable — polypeptide complex with multiple active components.

Reported Observations in Literature

Generally well-tolerated. Rare allergic reactions reported (biological extract). Injection site soreness.

Key Research References

  • Khavinson VK, Morozov VG. “Peptides of pineal gland and thymus prolong human life.” Neuro Endocrinol Lett. 2003

How Thymalin Works

Thymalin is a polypeptide complex extracted from calf thymus tissue. It modulates T-lymphocyte maturation, normalizes T-helper/T-suppressor ratios, and enhances cellular immunity. Works by supplementing the declining thymic peptide output that occurs with age-related thymic involution.

Research Findings

Developed at the Saint Petersburg Institute of Biogerontology. Published research spans decades in Russian medical literature. Used clinically in Russia and CIS countries as an immunomodulator.

Dosage & Administration

Clinical protocols: 5-10 mg intramuscularly daily for 5-10 day courses, repeated 1-4 times annually. Research use only.

Safety & Side Effects

Generally well-tolerated. Rare allergic reactions reported (biological extract). Injection site soreness.

Important: All safety information is derived from published research, primarily animal studies. No controlled human clinical trial data exists unless explicitly noted. This compound is sold for research purposes only.

Quick Facts

Sequence Polypeptide complex from bovine thymus
Molecular Weight Complex mixture
Half-Life Variable — polypeptide complex with multiple active components.
Available Sizes 10mg
Storage Lyophilized: -20°C. Reconstituted: 2-8°C.

Key Research References

  • Khavinson VK, Morozov VG. "Peptides of pineal gland and thymus prolong human life." Neuro Endocrinol Lett. 2003

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