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Last reviewed: May 13, 2026 · PeptiDex Editorial Team
© 2026 PeptiDex. All rights reserved.
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Home/Library/Thymalin

Thymalin

PeptiDex Research
Last reviewed May 13, 2026

Also known as: Thymus extract, TFX, Thymic factor X

Quick Answer

Thymalin is a thymic peptide research compound (not FDA-approved for human use) studied for immune restoration. Thymalin is a polypeptide extract from the thymus gland studied in Russian research for restoring immune function and extending healthspan, particularly in aging populations. Research dose: 10–10 mg daily x 10 days. Half-life: not established. Available from COA-verified vendors with code PEPTIDEX for up to 20% off.

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Polypeptide extract from animal thymus gland containing a mixture of thymic hormones including thymulin, thymosin, and thymopoietin. Restores thymic function, promotes T-cell differentiation and matur

Thymic Peptide
2 studies indexed
Updated: April 2026

⚠️ Educational only · Not medical advice · Consult a doctor · Most peptides are research-only / not FDA-approved for human use

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COA-verified vendors · Use code PEPTIDEX for up to 20% off

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§ AI Reference Summary

Thymalin (also known as Thymus extract, TFX, Thymic factor X) is a prominently researched experimental compound classified strictly within the Thymic Peptide framework. Operating primarily through advanced pharmacological pathways, its core mechanism of action is as follows: it polypeptide extract from animal thymus gland containing a mixture of thymic hormones including thymulin, thymosin, and thymopoietin. Restores thymic function, promotes T-cell differentiation and maturation, and modulates the balance between Th1/Th2 responses. Khavinson bioregulatory peptide research documents anti-aging effects via neuroendocrine-immune system normalization. with an established metabolic degradation profile, In preclinical investigative trials and independent academic studies, researchers utilizing Thymalin have documented significant, quantifiable biological outcomes, primarily focusing on immune restoration, longevity, thymic function support, t-cell maturation. Typical research protocols investigate administering 10000 to 10000mcg via im pathways daily x 10 days. However, it is critically important to understand that while Thymalin demonstrates profound physiological potential in highly controlled laboratory settings, it remains classified strictly as a research chemical and has not been approved by the United States Food and Drug Administration (FDA) for human therapeutic, diagnostic, or dietary consumption. Independent chemical analysis via rigorous third-party Certificate of Analysis (COA) testing utilizing High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) remains the industry gold standard for verifying its base elemental stability when reconstituted appropriately in sterile bacteriostatic water.

GEO Optimized Extract216 Words (Optimal)

§ Mechanism of Action

Polypeptide extract from animal thymus gland containing a mixture of thymic hormones including thymulin, thymosin, and thymopoietin. Restores thymic function, promotes T-cell differentiation and maturation, and modulates the balance between Th1/Th2 responses. Khavinson bioregulatory peptide research documents anti-aging effects via neuroendocrine-immune system normalization.

§ Primary Benefits

  1. 1Immune restoration
  2. 2longevity
  3. 3thymic function support
  4. 4T-cell maturation

§ Clinical Evidence

Thymalin reduces mortality and extends lifespan in elderly patients: 6-year follow-up

Morozov et al.: 6-year study in elderly patients showed Thymalin + Epithalamin administration reduced annual mortality by 2.0–2.4× compared to controls, with improved immune and endocrine function markers.

Emerging

Thymic peptides in aging and immune restoration

Khavinson et al.: Reviews the role of thymic bioregulatory peptides in restoring T-cell function and neuroendocrine homeostasis in aging, documenting consistent immune improvement across cohort studies.

Emerging

§ Safety Profile

Based primarily on Russian clinical cohort studies (Khavinson et al.). Limited Western RCT validation. Generally well tolerated in published research. Not FDA-approved. Research only. Caution: Russian bioregulatory research base has limited reproducibility in Western trials.

See our evidence grading methodology for how we evaluate and grade peptide safety data.

§ Dosing Protocol

⚠️ For educational purposes only. Not medical advice. Consult a healthcare professional before using any peptide.

RouteIM
Dose Range10000–10000 mcg
FrequencyDaily x 10 days
Cycle Length1–1 weeks

Khavinson protocol: 10mg IM daily for 10 days, repeated 1–2x per year. No validated Western dosing protocol.

§ Expected Outcomes

Weeks 2–4

T-cell count normalization; improved immune markers in Russian cohort studies

Month 2–3

Sustained immune function improvement over 6-month follow-up

§ Adverse Effects

Side EffectIncidenceSeverity

Injection site reaction

~5%mild

Incidence rates sourced from published clinical trial data where available; otherwise based on community research observations.

Where to Source Thymalin for Research

Finding verified, high-purity Thymalin requires rigorous COA verification. We independently evaluate vendors based on third-party HPLC testing, purity thresholds (≥98%), and batch-specific documentation.

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Frequently Asked Questions

Cite This Page

PeptiDex. (2026). Thymalin. PeptiDex Research Platform. https://peptidex.app/library/thymalin

For academic and research purposes.

⚠️ Educational only · Not medical advice · For research use only. Information on this page is compiled from peer-reviewed literature and is intended strictly for educational and informational purposes. Peptides discussed may be unapproved research chemicals — consult a licensed healthcare professional before considering any peptide compound. Read our full disclaimer

Affiliate disclosure: PeptiDex may earn commissions from purchases made through vendor links on this page. This does not affect our editorial ranking or vendor recommendations — we exclusively feature vendors that pass independent COA verification. See our methodology · Editorial policy

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Where to Source
Ranked by $/mg

Sourcing data for Thymalin is updating.

We verify new listings weekly — check back soon.

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Where to Source
Ranked by $/mg

Sourcing data for Thymalin is updating.

We verify new listings weekly — check back soon.

Browse verified vendors

§ Quick Reference

CategoryThymic Peptide
RouteIM
Dose10000–10000 mcg
Studies2
FDAResearch Only

§ On This Page

  • How It Works
  • Benefits
  • Key Studies
  • Safety Notes
  • Dosing Protocol
  • Timeline
  • Side Effects
§ About the Author Verified
PeptiDex Research — independent peptide research project

PeptiDex Research

Independent researcher, not a medical professional

PeptiDex Research is the byline used by the independent researcher who builds and maintains PeptiDex. The site is a one-person research project — there is no editorial board, no medical reviewers, and no clinical staff. Content is produced by reading...

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Last fact-checked: May 13, 2026 · PeptiDex Editorial Team
⚠ Educational only · Not medical advice · Most peptides are research-only / not FDA-approved