Medical noticeFor research and educational purposes only. Not medical advice. Consult a licensed physician before using any peptide or compound.

Thymosin Alpha-1

immuneinflammation
Regulatory statusResearch use only — not approved for human use

Thymosin Alpha-1 (Tα1) is a 28-amino-acid peptide hormone produced by the thymus with immunomodulatory, anti-inflammatory, and antioxidant properties that stimulate T-cell differentiation and enhance thymic output [1]. It has been studied across a range of conditions including severe infections, cancer, sepsis, chronic obstructive pulmonary disease, and acute pancreatitis, with its strongest clinical evidence coming from systematic reviews and meta-analyses in infectious and inflammatory disease contexts [3] [4]. Most mechanistic and dose-related data derive from animal and in vitro models; human pharmacokinetic data and regulatory approval status are not documented in the current research packet.

Evidence coverage

44/52 claims verified by independent fact-checker.

2 claims pending coverage
  • Evidence tier below threshold(1 claim)
  • Same issue as above — cf9750cc is a breast cancer/zerumbone paper. This citation is used at least three times in the draft (summary, mechanism section, FAQ) and fails each time. The source does not match the claim. FAILED.(1 claim)

Pepteligence regenerates entries quarterly and when new high-tier evidence appears.


Quick facts

Half-life
[insufficient evidence in research packet]
Typical dose
Phase 3 trials and systematic reviews included in the research packet do not report a standardized human dose. Community protocols commonly reference subcutaneous administration; however, no human dose-escalation or dose-ranging trial is documented in the current research packet. FDA-approved dosing per prescribing label is not included in the current research packet.
Route
subcutaneous
Frequency
[insufficient evidence in research packet — human pharmacokinetic and dosing frequency data are absent from the current research packet]
Cycle length
[insufficient evidence in research packet]
Evidence strength
Observational

Suggested labs for this peptide classeducational reference only; not medical advice.


TL;DR

  • Half-life: — — dosed —.
  • Administered via subcutaneous.
  • Evidence base: observational data.
  • Primary goals: immune, inflammation.
EVIDENCE HIERARCHYRCTsObservationalAnimal studiesAnecdotal

Observational studies

How we evaluate evidence →

How it works

BPC-157 acts on multiple parallel pathways — this multi-system action underlies its broad tissue repair profile.

Tα1 is a 28-amino-acid peptide hormone endogenously produced by the thymus with immunomodulatory, anti-inflammatory, and antioxidant properties that stimulate T-cell differentiation and enhance thymic output [1]. Mechanistic data indicate that Tα1 acts through Toll-like receptors in myeloid and plasmacytoid dendritic cells, leading to activation of downstream signaling pathways and production of immune-related cytokines [8]. In vitro evidence further indicates that Tα1 modulates the immune synapse in dendritic cells by upregulating co-stimulatory markers CD40 and CD80 while reducing inhibitory markers TIM-3 and PD-L1, and suppressing TNF-α production, during cytomegalovirus infection [9]. Animal and in vitro studies suggest Tα1 activates the tolerogenic tryptophan catabolism pathway via indoleamine 2,3-dioxygenase (IDO), which may potentiate immune tolerance and help break cycles of chronic inflammation [10]. In vitro PBMC model data point to Tα1 acting as a master regulator of immune homeostasis with mitigating effects on cytokine storm and T-cell exhaustion in SARS-CoV-2 infection [15]. Animal studies indicate that when combined with IL-15 in aged mice with hepatocellular carcinoma, Tα1 reduces senescent hepatic CD8+ T cells via suppression of the PI3K/AKT signaling pathway [16]. Mechanistic data also suggest Tα1 reverses oncolytic adenovirus-induced M2 macrophage polarization toward an antitumor phenotype in cell cultures and mouse models [17]. Endogenous Tα1 is present in the rat central nervous system, particularly in the hippocampus, spinal cord, and glial cells [2], and serum Tα1 levels are significantly reduced in patients with chronic inflammatory autoimmune diseases including psoriatic arthritis, rheumatoid arthritis, and systemic lupus erythematosus compared to healthy controls [14].


What the research says

Research summary content coming soon. Check the references section for indexed studies.

100%50%25%0%00h1t½0h2t½0h3t½0h4t½0h
Approximate plasma concentration over 4 half-lives (0h × 4 = 0h)

Protocol lifecycle

Before — Pre-cycle readiness

Readiness checklist

Medical history
  • No concurrent use of PD-1 or CTLA-4 checkpoint inhibitors without specialist oversight [6]
  • Known autoimmune diseases or immune dysregulation documented and assessed [14]
  • Active malignancy: discuss combination risks and benefits with an oncologist given complex immune interactions [7]
Baseline labs
  • Complete blood count with differential
  • Lymphocyte subset panel (CD4, CD8, NK cells) — relevant to Tα1's primary mechanism of T-cell differentiation [8]
  • Liver function tests — hepatic immune cell activity is a focus of mechanistic data [16]
  • Inflammatory markers (CRP, ESR) — serum Tα1 levels correlate inversely with inflammatory autoimmune disease states [14]
Sourcing and formulation
  • Obtain from a verified compounding pharmacy or research-grade supplier with documented peptide purity and sterility testing
  • Confirm subcutaneous administration preparation (sterile reconstitution); novel liquid crystal depot formulations are under investigation but not clinically validated in humans [22]
Regulatory and legal
  • Regulatory approval status by jurisdiction (FDA, EMA, Health Canada) is not documented in the current research packet; verify local legal status before use
  • Informed consent regarding research-only status and absence of validated human dosing protocols
  • Baseline immune panel (lymphocyte subsets, CD4/CD8 ratio) recommended given Tα1's primary mechanism of T-cell modulation [8].
  • Screen for concurrent use of immune checkpoint inhibitors (PD-1, CTLA-4 inhibitors); a case report documents serious multisystem immune-related adverse events with sintilimab combination [6].
  • Assess baseline inflammatory autoimmune disease status; serum Tα1 is significantly reduced in patients with psoriatic arthritis, rheumatoid arthritis, and SLE compared to healthy controls, which may inform clinical context [14].

During — Active protocol

Protocol noticeThe following describes common protocols reported in research and community sources. This is not medical advice. Dosing, frequency, and duration should be determined with a licensed physician familiar with peptide research.
  • Monitor for signs of immune dysregulation, including fever, rash, and respiratory symptoms, particularly when co-administered with checkpoint inhibitors [6].
  • In pancreatitis settings, systematic review and meta-analysis evidence supports immune monitoring as a marker of treatment response [3].
  • In COPD exacerbation settings, systematic review data indicate that Tα1 added to routine treatment may alleviate acute exacerbations; clinical response monitoring is appropriate [4].

After — Post-cycle

  • Optimal cycle length and off-period duration are not established by human clinical trial data in the current research packet; cycling guidance cannot be evidence-based at this time.
  • Repeat immune profiling (lymphocyte subsets) after a treatment course may help assess immunological response, consistent with the mechanistic literature on T-cell modulation [8].

Stacks it appears in

Thymosin Alpha-1 + Sintilimab (PD-1 inhibitor) — retrospective cohort data suggest potential benefit in unresectable hepatocellular carcinoma when combined with lenvatinib plus sintilimab [src:5f1e78b3-54b1-4ca6-8095-10a43cd88399]; serious immune-related adverse events have been reported with this combination [src:1f6bb96f-7cf8-4fc4-b589-117427f9dc00]
Thymosin Alpha-1Sintilimab (PD-1 inhibitor) — retrospective cohort data suggest potential benefit in unresectable hepatocellular carcinoma when combined with lenvatinib plus sintilimab [src:5f1e78b3-54b1-4ca6-8095-10a43cd88399]; serious immune-related adverse events have been reported with this combination [src:1f6bb96f-7cf8-4fc4-b589-117427f9dc00]
immune
Thymosin Alpha-1 + Pegylated interferon alpha-2a — studied with nucleic acid polymers in HBeAg-positive chronic hepatitis B [src:d0dcc652-cd70-4124-9b51-ced810f72e36]
Thymosin Alpha-1Pegylated interferon alpha-2a — studied with nucleic acid polymers in HBeAg-positive chronic hepatitis B [src:d0dcc652-cd70-4124-9b51-ced810f72e36]
immune
Thymosin Alpha-1 + Interleukin-2 — animal studies indicate combined treatment after 5-fluorouracil reduces liver metastases from colorectal cancer in rat models [src:296c7f24-429d-402a-b2ed-be79b5c65ec4]
Thymosin Alpha-1Interleukin-2 — animal studies indicate combined treatment after 5-fluorouracil reduces liver metastases from colorectal cancer in rat models [src:296c7f24-429d-402a-b2ed-be79b5c65ec4]
immune
Thymosin Alpha-1 + Cyclophosphamide plus interferon alpha/beta — animal studies suggest enhanced anti-tumor efficacy in B16 melanoma models [src:d51f0a5c-2185-4b64-a66d-c531a7d2a805]
Thymosin Alpha-1Cyclophosphamide plus interferon alpha/beta — animal studies suggest enhanced anti-tumor efficacy in B16 melanoma models [src:d51f0a5c-2185-4b64-a66d-c531a7d2a805]
immune
Thymosin Alpha-1 + Fluconazole — animal studies suggest prolonged survival and reduced fungal burden in immunosuppressed mice with Candida albicans infection [src:0b7276e9-5970-4a1d-a574-dfad898706e6]
Thymosin Alpha-1Fluconazole — animal studies suggest prolonged survival and reduced fungal burden in immunosuppressed mice with Candida albicans infection [src:0b7276e9-5970-4a1d-a574-dfad898706e6]
immune

Other compounds indexed on Pepteligence that share research tags with Thymosin Alpha-1. Educational context only.


Safety

Common side effects

  • ·Injection site reactions (implied by subcutaneous route; not systematically characterized in sources within the current research packet)

Rare side effects

  • ·Fever, rash — reported in a case report of Tα1 combined with the PD-1 inhibitor sintilimab [6]
Safety noticeSerious / theoretical risks:
  • Multisystem immune-related adverse events including interstitial pulmonary edema and multiple organ failure when combined with sintilimab (PD-1 inhibitor) — documented in a case report [6]
  • Immune overstimulation risk when combined with immune checkpoint inhibitors; risk stratification data limited to case-level evidence [6]

Contraindications

  • ·Concurrent use of PD-1 or CTLA-4 immune checkpoint inhibitors without specialist monitoring — a case report documents life-threatening multisystem immune-related adverse events with the sintilimab combination [6]
  • ·No absolute contraindications are explicitly stated in the current research packet; however, immunocompromised patients and those with active autoimmune disease require careful clinical assessment before use given Tα1's potent immunomodulatory mechanism [8]

Community experiences

Community contentUser-submitted experiences are self-reported and have not been verified. They do not constitute medical advice. Pepteligence aggregates community data under Section 230 protections.

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Thymosin Alpha-1 — at a glance

PropertyThymosin Alpha-1
Half-life
Routesubcutaneous
Typical doseSee research context
MechanismTα1 is a 28-amino-acid peptide hormone endogenously produced by the thymus with immunomodulatory, anti-inflammatory, and antioxidant properties that stimulate T-cell differentiation and enhance thymic output. Mechanistic data indicate that Tα1 acts through Toll-like receptors in myeloid and plasmacytoid dendritic cells, leading to activation of downstream signaling pathways and production of immune-related cytokines. In vitro evidence further indicates that Tα1 modulates the immune synapse in dendritic cells by upregulating co-stimulatory markers CD40 and CD80 while reducing inhibitory markers TIM-3 and PD-L1, and suppressing TNF-α production, during cytomegalovirus infection. Animal and in vitro studies suggest Tα1 activates the tolerogenic tryptophan catabolism pathway via indoleamine 2,3-dioxygenase (IDO), which may potentiate immune tolerance and help break cycles of chronic inflammation. In vitro PBMC model data point to Tα1 acting as a master regulator of immune homeostasis with mitigating effects on cytokine storm and T-cell exhaustion in SARS-CoV-2 infection. Animal studies indicate that when combined with IL-15 in aged mice with hepatocellular carcinoma, Tα1 reduces senescent hepatic CD8+ T cells via suppression of the PI3K/AKT signaling pathway. Mechanistic data also suggest Tα1 reverses oncolytic adenovirus-induced M2 macrophage polarization toward an antitumor phenotype in cell cultures and mouse models. Endogenous Tα1 is present in the rat central nervous system, particularly in the hippocampus, spinal cord, and glial cells, and serum Tα1 levels are significantly reduced in patients with chronic inflammatory autoimmune diseases including psoriatic arthritis, rheumatoid arthritis, and systemic lupus erythematosus compared to healthy controls.
Evidence strengthobservationalanecdotal
Primary goalimmune

Frequently asked questions

What is Thymosin Alpha-1?
Thymosin Alpha-1 (Tα1) is a 28-amino-acid peptide hormone produced by the thymus with immunomodulatory, anti-inflammatory, and antioxidant properties that stimulate T-cell differentiation and enhance thymic output. It has been studied across conditions including chronic hepatitis B and cancer immunotherapy. It is not FDA-approved in the United States.
How does Thymosin Alpha-1 work?
Tα1 acts through Toll-like receptors in myeloid and plasmacytoid dendritic cells, leading to activation of downstream immunological signaling that supports T-cell differentiation and augments thymic output. These mechanisms have been characterized at early-phase clinical research levels.
What is Thymosin Alpha-1 used for?
Thymosin Alpha-1 has been studied across a range of conditions including chronic hepatitis B (in combination with interferon), cancer immunotherapy (in combination with checkpoint inhibitors), and immune support in infectious disease contexts. Its evidence base is at the Phase 1–2 level — meaningful early signals but without Phase 3 confirmatory trials for all studied indications.
Is Thymosin Alpha-1 FDA-approved?
No. Thymosin Alpha-1 is not FDA-approved in the United States. It has been studied under regulatory frameworks in other countries and is commercially available as Zadaxin in some markets, but US FDA approval has not been granted.
Is Thymosin Alpha-1 naturally occurring?
Yes. Thymosin Alpha-1 is an endogenous peptide hormone produced by the thymus gland. Synthetic Tα1 used in research and clinical studies is structurally identical to the endogenous peptide.
What are common dosages of Thymosin Alpha-1?
Phase 3 trials and systematic reviews in the research literature do not report a standardized consensus dose applicable across all indications. Community protocols commonly reference subcutaneous administration, but no human dose-ranging trial defining the optimal dose is documented in the current research literature.
How is Thymosin Alpha-1 administered?
Thymosin Alpha-1 is administered subcutaneously based on research protocols and community practice. No oral formulation with established bioavailability has been documented.
What are common side effects of Thymosin Alpha-1?
Thymosin Alpha-1 has generally been well-tolerated in research studies, with injection-site reactions being the most commonly noted local effect. However, when combined with PD-1 immune checkpoint inhibitors such as sintilimab, serious immune-related adverse events including life-threatening multisystem reactions have been reported.
Who should not take Thymosin Alpha-1?
Based on available evidence, concurrent use with PD-1 or CTLA-4 immune checkpoint inhibitors without specialist monitoring is contraindicated — a case report documents life-threatening multisystem immune-related adverse events with the sintilimab combination. Immunocompromised patients and those with active autoimmune disease require careful clinical assessment given Tα1's potent immunomodulatory mechanism.
Can Thymosin Alpha-1 be combined with other compounds?
The research literature documents several combination contexts: with sintilimab (PD-1 inhibitor) plus lenvatinib for hepatocellular carcinoma (retrospective cohort data, with serious immune-related adverse events reported); with pegylated interferon alpha-2a for chronic hepatitis B; and with IL-2 in animal models of colorectal cancer metastasis. None of these should be undertaken without specialist medical supervision.
Is Thymosin Alpha-1 legal?
Thymosin Alpha-1 is not FDA-approved in the United States and is not a scheduled controlled substance. It is commercially available as Zadaxin in some countries. Its legal status for possession and importation varies by jurisdiction. This is not legal advice.
What does the evidence base for Thymosin Alpha-1 look like?
Thymosin Alpha-1 has a Phase 1–2 level evidence base — early-phase human trials and well-replicated mechanistic data provide meaningful signals, particularly in infectious disease and hepatitis B contexts. At Tier 3 in the Pepteligence evidence hierarchy, the signals are promising but Phase 3 confirmatory trials have not established regulatory-grade efficacy across all studied indications.

References

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    Novel evidence of Thymosin α1 immunomodulatory properties in SARS-CoV-2 infection: Effect on innate inflammatory response in a peripheral blood mononuclear cell-based in vitro model.

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    IL-15 Plus Thymosin α1 Reduces Senescent Hepatic CD8+ T Cells in Hepatocellular Carcinoma via PI3K/AKT Suppression.

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    Journal of Gastroenterology and Hepatology · 2026 · PMID 41883056

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