New — Free Peptide Starter Guide (2026): 13 chapters, 34 cited studies

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Thymagen

Also known as: Glu-Asp, Khavinson thymus peptide, Thymic dipeptide bioregulator

Thymagen is a dipeptide bioregulator (Glu-Asp) developed by Professor Vladimir Khavinson, tissue-specific for the thymus gland. It supports T-lymphocyte maturation, thymic function, and immune system normalization. As the thymus involutes with age (thymic atrophy), immune competence declines. Thymagen is used to support immune restoration, particularly in aging, post-illness recovery, and immunodeficiency states.

Half-Life

Short (minutes); sustained gene-regulatory effects

Route

SubQ, Oral

Category

Immune Support

Studies

50 references

Key Benefits

  • Supports thymic epithelial cell function and T-cell maturation
  • May partially restore thymic output reduced by age-related atrophy
  • Normalizes T-lymphocyte subpopulation balance
  • Supports immune recovery after illness, surgery, or chemotherapy
  • Anti-aging effects on thymic tissue
  • Complementary to Thymosin Alpha-1 and Thymalin in immune protocols
  • May improve vaccine responsiveness in older individuals

Mechanism of Action

Thymagen's dipeptide Glu-Asp interacts with chromatin in thymic epithelial cells and thymocytes, modulating expression of thymic hormones and T-cell differentiation factors. It promotes normalization of T-lymphocyte development and may partially restore thymic output in age-related thymic atrophy. This supports a more youthful immune profile with better T-cell diversity and responsiveness to novel antigens.

Dosing Protocols

Standard Khavinson Protocol

Dose
10 mg per day
Frequency
Daily for 10–30 days
Timing
Subcutaneous injection or oral (enteric-coated)
Cycle
10–30 day course, repeated 2–4x per year

Often stacked with Epithalon and Vilon in comprehensive immune-longevity protocols. Research use only.

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Side Effects

  • Generally well tolerated
  • Mild injection site reactions
  • No significant immunological adverse events reported

Contraindications

Not FDA approved. Caution in autoimmune conditions where T-cell activation may worsen disease. Medical oversight recommended.

Storage

Store at 2–8°C. Protect from moisture and light.

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  2. 2.
    Environmental Contributions to Proton Sharing in Protein Low-Barrier Hydrogen Bonds

    Lin J, Gerlits O, Kneller DW, Weiss KL, Coates L, Clarke JL et al. · Biochemistry · 2026PubMed Verified

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    Precision Labeling of Native Antibodies with Lock Coupling

    Liu Y, Nadig I, Mehta AS, Chuo SW, Ho YH, Tyler J et al. · Journal of the American Chemical Society · 2026PubMed Verified

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    Recombinant Expression and Characterization of a New Endogenous and Halophilic GH13_5 Subfamily α-Amylase from Paenibacillus pabuli

    Dos Reis KL, Barbosa-Tessmann IP · Applied biochemistry and biotechnology · 2026PubMed Verified

  6. 6.
    Side Reaction Analysis in Solid-Phase Peptide Synthesis: A Case Study in the Glu-Asp-Tyr Motif

    Monti A, Caporale A, Ruvo M, Doti N · Journal of peptide science : an official publication of the European Peptide Society · 2026PubMed Verified

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    Environmental Contributions to Proton Sharing in Protein Low-Barrier Hydrogen Bonds

    Lin J, Gerlits O, Kneller DW, Weiss KL, Coates L, Hix MA et al. · bioRxiv : the preprint server for biology · 2025PubMed Verified

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    AI-designed PNA-peptide chimera overcomes suboptimal binding for dual inhibition of viral RdRp

    Shehzadi K, Kalsoom I, Irfan M, Yu MJ, Meng Z, Liang JH · European journal of medicinal chemistry · 2026PubMed Verified

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    Modulation of flavour perception under sodium-reduced conditions: A sensory-metabolic interaction framework driven by Debaryomyces hansenii SH4 and KCl

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    Mapping the Subtype-Specific PARP1 ADP-ribosylated Proteome in Breast Cancer Cells

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    Current mechanistic insights into biochemical properties and cellular functions of human Caf1 deadenylases

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    Integration of metagenomics and targeted metabolomics reveals the flavor metabolism network of the microbial community in traditional watermelon soybean paste

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    Modeling myocardial physiological growth using human pluripotent stem cell derived cardiomyocytes and 3D cardiac microtissues

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    Lysine-Histidine Transporter 4 (AtLHT4) facilitates the uptake of narciclasine, a bioactive alkaloid, in Arabidopsis

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    Characterization and bioaccessibility of Fe(2+)-oat bran peptide chelate

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    The Inhibitory Effect and Adsorption Properties of Testagen Peptide on Copper Surfaces in Saline Environments: An Experimental and Computational Study

    Dobriţescu A, Samide A, Cioateră N, Mic OC, Ionescu C, Dăbuleanu I et al. · Molecules (Basel, Switzerland) · 2025PubMed Verified

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    One single hydrogen bond guarantees conformational stability and activity in coproheme decarboxylase from Corynebacterium diphtheriae

    Patil G, Frasko P, Lier B, Gabler T, Furtmüller PG, Oostenbrink C et al. · Journal of inorganic biochemistry · 2025PubMed Verified

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    Fabrication of Site-Specific 3D Structures via Macroscopic Supramolecular Assembly for Spatially Controlled Alignment of Multiple Cells

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    Self-cross-linked carboxymethyl chitosan/polyethylene glycol hydrogel containing bioactive peptide accelerates bacterial-infected wound healing

    Ren C, Wang Y, Zhang S, Xu X, Sheng W, Li P et al. · International journal of biological macromolecules · 2025PubMed Verified

  22. 22.
    The Antioxidant Tetrapeptide Epitalon Enhances Delayed Wound Healing in an in Vitro Model of Diabetic Retinopathy

    Gatta M, Dovizio M, Milillo C, Ruggieri AG, Sallese M, Antonucci I et al. · Stem cell reviews and reports · 2025PubMed Verified

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    Bioprosthetic heart valves with zwitterionic copolymer grafting to improve the properties of endothelialization and anti-calcification

    Zhu D, Luo Y, Huang S, Ma L · Biomedical materials (Bristol, England) · 2025PubMed Verified

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    Flecainide sensitizes conduction to hyponatremia through an ephaptic mechanism

    Adams WP, Hoeker GS, Poelzing S · Heart rhythm · 2025PubMed Verified

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    Analyzing the Effect of Dried Shrimp on the Flavor of Sheep Bone Soup Through Sensory Evaluation Combined with Untargeted Approaches

    Zhu Q, Zhang L, Sun X, Sun B, Zhang Y · Foods (Basel, Switzerland) · 2025PubMed Verified

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    Binding of potential antitumor Casiopeínas® to small proteins

    Pisanu F, Sciortino G, Maseras F, Ugone V, Sanna D, Garribba E · Dalton transactions (Cambridge, England : 2003) · 2025PubMed Verified

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    Molecular structure and enzymatic mechanism of the human collagen hydroxylysine galactosyltransferase GLT25D1/COLGALT1

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    Overview of Epitalon-Highly Bioactive Pineal Tetrapeptide with Promising Properties

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    A self-sacrificing anti-inflammatory coating promotes simultaneous cardiovascular repair and reendothelialization of implanted devices

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    Disruption of G3BP1 granules promotes mammalian CNS and PNS axon regeneration

    Sahoo PK, Agrawal M, Hanovice N, Ward PJ, Desai M, Smith TP et al. · Proceedings of the National Academy of Sciences of the United States of America · 2025PubMed Verified

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    Ubiquitin is directly linked via an ester to protein-conjugated mono-ADP-ribose

    Bejan DS, Lacoursiere RE, Pruneda JN, Cohen MS · The EMBO journal · 2025PubMed Verified

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    Inhibition effect of AGEs formation in vitro by the two novel peptides EDYGA and DLLCIC derived from Pelodiscus sinensis

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    Novel Insights Into Peptide-Calcium Chelates From Lentinula edodes: Preparation and Its Structure, Stability, and Calcium Transport Analysis

    Gu H, Liang L, Wei Y, Wang JH, Ma W, Fu Y et al. · Food science & nutrition · 2025PubMed Verified

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    Prediction of individual total amino acids and free amino acids in Chinese Holstein cows milk using mid-infrared spectroscopy and their phenotypic variability

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    Chiral Amino Acids Mediate Mitochondria-Dependent Apoptosis of Human Proximal Tubular Epithelial Cells Under Oxidative Stress

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    An optical BOD biosensor based on intracellular ATP measurements in genetically modified Saccharomyces cerevisiae

    Kanno Y, Tateno Y, Akimoto T · Analytical sciences : the international journal of the Japan Society for Analytical Chemistry · 2025PubMed Verified

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    Injectable and self-healing carboxymethyl chitosan/carboxymethyl cellulose/marine snail peptide hydrogel for infected wound healing

    Ren C, Zhang S, Zhang Z, Li H, Sheng W, Wang X et al. · International journal of biological macromolecules · 2025PubMed Verified

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    Unraveling Spatiotemporal Metabolic Perturbation of Amino Acids Associated with Ischemia-Reperfusion Injury by MALDI MS Imaging

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    Structural Catalytic Core in Subtilisin-like Proteins and Its Comparison to Trypsin-like Serine Proteases and Alpha/Beta-Hydrolases

    Denesyuk AI, Denessiouk K, Johnson MS, Uversky VN · International journal of molecular sciences · 2024ReviewPubMed Verified

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    Short Peptides Protect Fibroblast-Derived Induced Neurons from Age-Related Changes

    Kraskovskaya N, Linkova N, Sakhenberg E, Krieger D, Polyakova V, Medvedev D et al. · International journal of molecular sciences · 2024PubMed Verified

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    A binuclear metallohydrolase model for RelA/SpoT-Homolog (RSH) hydrolases

    Zhou RW, Manisa B, Wang B · The Journal of biological chemistry · 2024PubMed Verified

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    Lanthanum(III)-amino acid chelate mitigates copper(II) stress in rice (Oryza sativa)

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    Balancing functions of antifouling, nitric oxide release and vascular cell selectivity for enhanced endothelialization of assembled multilayers

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    Structural, Biochemical, and Phylogenetic Analysis of Bacterial and Fungal Carbohydrate Esterase Family 15 Glucuronoyl Esterases in the Rumen

    Gruninger RJ, Kevorkova M, Low KE, Jones DR, Worrall L, McAllister TA et al. · The protein journal · 2024PubMed Verified

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    Polyphenol-Reinforced Glycocalyx-Like Hydrogel Coating Induced Myocardial Regeneration and Immunomodulation

    Wan H, Yang X, Zhang Y, Liu X, Li Y, Qin Y et al. · ACS nano · 2024PubMed Verified

  48. 48.
    Discovery of ester-linked ubiquitylation of PARP10 mono-ADP-ribosylation in cells: a dual post-translational modification on Glu/Asp side chains

    Bejan DS, Lacoursiere RE, Pruneda JN, Cohen MS · bioRxiv : the preprint server for biology · 2024PubMed Verified

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    Cited2 is a key regulator of placental development and plasticity

    Kuna M, Soares MJ · BioEssays : news and reviews in molecular, cellular and developmental biology · 2024ReviewPubMed Verified

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    Disruption of G3BP1 Granules Promotes Mammalian CNS and PNS Axon Regeneration

    Sahoo PK, Agrawal M, Hanovice N, Ward P, Desai M, Smith TP et al. · bioRxiv : the preprint server for biology · 2025PubMed Verified

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice. Many compounds listed are research chemicals not approved for human use. Always consult a qualified healthcare professional before starting any protocol.

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