Thymosin Alpha-1

Buy Thymosin Alpha-1 Research Peptide | Trusted Immune Research Peptide | PrimaLab Peptide

Thymosin Alpha-1 (Tα1) is one of the most extensively studied immunomodulatory peptides in modern peptide science, with a research history spanning more than five decades since its original isolation from thymosin fraction 5 in the 1970s. Researchers who buy Thymosin Alpha-1 research peptide use it to investigate T-cell biology, dendritic cell function, natural killer (NK) cell activity, cytokine regulation, and broader immune system modulation in both in vitro and in vivo research models. PrimaLab Peptide supplies research-grade Thymosin Alpha-1 at 99.36% purity, independently verified by Janoshik Analytical via HPLC and mass spectrometry, with a full batch-specific Certificate of Analysis included with every order.

What Is Thymosin Alpha-1 (Tα1)?

Thymosin Alpha-1 is a 28-amino acid synthetic peptide that matches the endogenous N-terminal fragment of prothymosin alpha, originally isolated from thymosin fraction 5 — a calf thymus extract. It is one of the most characterised peptides in immunology research, with its complete sequence, structure, and synthetic reproducibility well established in the scientific literature. A comprehensive overview of Thymosin Alpha-1 research history and mechanisms is available through the published PubMed literature on Tα1.

The full amino acid sequence of Thymosin Alpha-1 is:

Ac-Ser-Asp-Ala-Ala-Val-Asp-Thr-Ser-Ser-Glu-Ile-Thr-Thr-Lys-Asp-Leu-Lys-Glu-Lys-Lys-Glu-Val-Val-Glu-Glu-Ala-Glu-Asn-OH

A key structural feature is its N-terminal acetylation (Ac-), which confers resistance to aminopeptidase degradation and is essential for biological activity. The molecular formula is C₁₂₉H₂₁₅N₃₃O₅₅ with a molecular weight of 3108.3 g/mol (CAS: 62304-98-7). Not all commercial sources of Thymosin Alpha-1 are equal — synthesis quality, acetylation efficiency, and post-synthesis purification significantly affect purity and research utility, which is why independent third-party verification through Janoshik Analytical is a non-negotiable standard at PrimaLab Peptide.

Thymosin Alpha-1 Research Applications

Thymosin Alpha-1 has one of the broadest and most well-documented research profiles of any immunomodulatory peptide. Published research available on PubMed has examined Tα1 across the following research contexts:

• T-cell maturation and activation research: Thymosin Alpha-1 is studied for its role in promoting T-cell differentiation in the thymus and activating peripheral T-cell populations — fundamental mechanisms in adaptive immune research
• Dendritic cell biology: Research has examined Tα1’s effects on dendritic cell maturation, antigen presentation efficiency, and downstream T-cell priming — key processes in innate-to-adaptive immune transition research
• Natural killer (NK) cell activity: Studies have investigated Thymosin Alpha-1’s modulation of NK cell cytotoxic activity, relevant to innate immune defence research models
• Cytokine regulation research: Tα1 has been studied for its effects on interferon production (IFN-α, IFN-γ), interleukin pathways (IL-2, IL-6, IL-12), and TNF-α regulation in inflammatory and immune research models
• Antiviral immune pathway research: Thymosin Alpha-1 has been extensively studied in antiviral immunity research contexts, with published literature examining its effects on viral clearance mechanisms in preclinical models
• Antibacterial immune response research: Research has explored Tα1’s role in enhancing phagocytic activity and bacterial clearance mechanisms in immune dysfunction research models
• Toll-like receptor (TLR) pathway research: Recent research has examined Tα1’s interaction with TLR signalling pathways, particularly TLR-9, in innate immune activation research — see NIH-published research on Thymosin Alpha-1 and TLR pathways

Thymosin Alpha-1 is frequently studied alongside complementary immune and healing research peptides. Researchers investigating comprehensive immune modulation and tissue protection protocols often explore Tα1 alongside KPV Peptide (melanocortin receptor anti-inflammatory), SS-31 (Elamipretide) (mitochondrial protection), BPC-157 (multi-system tissue repair), and TB-500 (Thymosin Beta-4) (actin-mediated tissue regeneration). Browse our complete Healing & Repair Peptides category for the full range of related compounds.

Purity & Third-Party Testing

Purity in immunology research is particularly critical — even minor impurities in a peptide sample can trigger non-specific immune responses in cell culture models, completely confounding experimental results. PrimaLab Peptide supplies Thymosin Alpha-1 with independent verification through Janoshik Analytical, a respected independent European analytical laboratory widely used in the research peptide community.

Our current batch of Thymosin Alpha-1 research peptide tests at 99.36% purity, confirmed by:

• HPLC (High-Performance Liquid Chromatography) — quantitative purity determination
• Mass Spectrometry — molecular identity confirmation (MW: 3108.3 g/mol, matching the full 28-residue acetylated sequence)

The Janoshik COA is batch-specific and available on request. Every batch we stock is independently tested — we do not batch-swap without notice, and we do not publish unverified purity claims. Researchers can verify the batch data directly before ordering.

Storage & Reconstitution

Thymosin Alpha-1 from PrimaLab Peptide is supplied as a lyophilized white powder for maximum stability during storage and transit. Correct storage is essential to preserve research utility.

Storage guidelines:

• Long-term storage (sealed, lyophilized): −20°C in a dry environment, away from moisture and light. Use sealed vials with desiccant for optimal protection
• Short-term storage (lyophilized): +4°C for up to 4 weeks if accessing regularly
• After reconstitution: Store at +4°C and use within 7–14 days. Reconstituting with Bacteriostatic Water (BAC Water) — rather than plain sterile water — extends post-reconstitution shelf life at 4°C due to the antimicrobial preservation provided by benzyl alcohol
• Freeze-thaw cycles: Avoid repeated freeze-thaw cycles, which degrade peptide integrity. Aliquot into single-use volumes before freezing if your protocol requires multiple uses from the same batch
• Solubility: Thymosin Alpha-1 is soluble in sterile water or PBS at approximately 1 mg/mL. Add solvent slowly down the inside vial wall and swirl gently — do not shake

Product Specifications

Peptide Name	Thymosin Alpha-1 (Tα1)
CAS Number	62304-98-7
Sequence	Ac-Ser-Asp-Ala-Ala-Val-Asp-Thr-Ser-Ser-Glu-Ile-Thr-Thr-Lys-Asp-Leu-Lys-Glu-Lys-Lys-Glu-Val-Val-Glu-Glu-Ala-Glu-Asn-OH
Sequence Length	28 amino acids
N-Terminal Modification	Acetylated (Ac-)
Molecular Formula	C₁₂₉H₂₁₅N₃₃O₅₅
Molecular Weight	3108.3 g/mol
Purity	99.36% (Janoshik HPLC + Mass Spectrometry verified)
Form	Lyophilized white powder
Available Sizes	3mg, 10mg
Storage (long-term)	−20°C, away from moisture and light
Storage (short-term)	+4°C for up to 4 weeks
Storage (reconstituted)	+4°C, use within 7–14 days
Solubility	Sterile water or PBS at ~1 mg/mL
Reconstitution	Bacteriostatic Water (BAC Water) recommended
Testing Lab	Janoshik Analytical (independent)
COA	Available per batch — Janoshik verified
Intended Use	Laboratory research purposes only

Frequently Asked Questions — Thymosin Alpha-1 Research Peptide

What is Thymosin Alpha-1 used for in research?

Researchers who buy Thymosin Alpha-1 research peptide use it to investigate T-cell maturation and activation, dendritic cell function and antigen presentation, NK cell cytotoxic activity, cytokine regulation (interferons and interleukins), antiviral and antibacterial immune pathway mechanisms, and Toll-like receptor signalling research. With a research history spanning more than 50 years, Tα1 has one of the most comprehensive published profiles of any immunomodulatory research peptide. Explore the full literature base on PubMed.

Why is N-terminal acetylation important in Thymosin Alpha-1?

The N-terminal acetylation (Ac-) of Thymosin Alpha-1 is not a minor structural detail — it is essential for biological activity and research utility. The acetyl group protects the peptide’s N-terminus from aminopeptidase degradation, extending its functional stability in biological research systems. Synthetic Thymosin Alpha-1 without correct N-terminal acetylation produces a structurally distinct compound with different stability and receptor interaction properties. All PrimaLab Peptide Thymosin Alpha-1 batches include mass spectrometry confirmation of the correct MW (3108.3 g/mol), verifying the presence of the N-terminal acetyl modification.

How pure is PrimaLab Peptide’s Thymosin Alpha-1?

Our current batch tests at 99.36% purity, independently verified by Janoshik Analytical using HPLC and mass spectrometry. The batch-specific COA is available on request. Purity at this level is particularly important in immunology research, where peptide impurities can trigger non-specific immune responses that confound experimental results.

How should I reconstitute Thymosin Alpha-1 for research use?

Thymosin Alpha-1 is soluble in sterile water or PBS at approximately 1 mg/mL. For extended post-reconstitution shelf life at +4°C, reconstitute with Bacteriostatic Water (BAC Water) — the benzyl alcohol preservative inhibits microbial contamination and extends usable life compared to plain sterile water. Add solvent slowly down the inside wall of the vial, swirl gently, and allow 2–3 minutes for complete dissolution. Store reconstituted Tα1 at +4°C and use within 7–14 days. Aliquot before freezing if your protocol requires multiple uses.

What peptides are commonly researched alongside Thymosin Alpha-1?

Thymosin Alpha-1 is frequently studied alongside other immune modulation and tissue repair research peptides. Common research combinations include KPV Peptide (melanocortin receptor anti-inflammatory pathway research), BPC-157 (multi-system tissue repair and gastrointestinal research), TB-500 (Thymosin Beta-4) (actin-mediated cellular migration and regeneration), and SS-31 (Elamipretide) (mitochondrial protection and cellular energy research). Browse the full Healing & Repair Peptides category.

Is Thymosin Alpha-1 the same as Thymosin Beta-4 (TB-500)?

No — these are two structurally and mechanistically distinct research peptides despite sharing the “thymosin” name. Thymosin Alpha-1 (Tα1) is a 28-amino acid acetylated peptide derived from thymosin fraction 5, primarily studied in immunomodulatory research contexts including T-cell activation, cytokine regulation, and antiviral immune pathways. TB-500 (Thymosin Beta-4 Acetate) is a separate peptide derived from a different thymosin family protein, primarily studied for its role in actin polymerisation, cellular migration, and tissue repair mechanisms. They are complementary research tools with distinct biological targets.

What are the import regulations for buying Thymosin Alpha-1 research peptide?

Import regulations for research peptides vary significantly by country and jurisdiction. PrimaLab Peptide ships Thymosin Alpha-1 research peptide worldwide for legitimate laboratory research purposes. Researchers are responsible for verifying local import regulations, institutional approvals, and compliance requirements applicable to peptide research compounds in their jurisdiction before placing an order. All shipments are clearly labelled for research use only.

Related Research Peptides

Researchers buying Thymosin Alpha-1 research peptide for immune modulation and cellular health studies frequently explore the following related compounds from PrimaLab Peptide:

• KPV Peptide — C-terminal alpha-MSH tripeptide studied for melanocortin receptor anti-inflammatory mechanisms
• BPC-157 — body protection compound researched for multi-system tissue repair and gastrointestinal protection
• TB-500 (Thymosin Beta-4 Acetate) — actin-regulated cellular migration and tissue regeneration peptide
• GHK-Cu (Copper Peptide) — collagen synthesis, dermal matrix repair, and wound healing research peptide
• SS-31 (Elamipretide) — mitochondria-targeted tetrapeptide studied for cellular protection and energy metabolism

Browse our complete Healing & Repair Peptides category for all related compounds. Bulk researchers and laboratory procurement teams can apply for discounted rates through our Wholesale Portal. Reconstitution supplies including BAC Water are available in our Accessories & Reconstitution Supplies section.

⚠️ For laboratory research use only. Not intended for human or veterinary consumption. Must be handled by qualified research professionals in a controlled laboratory environment in accordance with all applicable institutional, ethical, and regulatory guidelines. Always verify local import regulations before ordering.