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Thymosin-alpha-1

Thymalfasin, Zadaxin, Thymosin α1

A synthetic 28-amino acid peptide that enhances immune function by modulating T-cell activity, used for viral infections and immunodeficiencies.

Quick Stats
Studies 759
Trials 63
Formula C129H215N33O55
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Utility 2
pubmed 1986

Phase I/II trial of thymosin fraction 5 and thymosin alpha one in HTLV-III seropositive subjects.

Schulof. R S RS; Simon. G L GL; Sztein. M B MB; Parenti. D M DM; DiGioia. R A RA; Courtless. J W JW;...

In a small early‑stage trial, daily injections of a thymosin mixture (TF5) at 60 mg helped restore a specific immune test (MLR) in a few people with advanced HIV‑like infection, without serious side effects except occasional skin irritation. The single‑dose thymosin‑alpha‑1 didn’t show benefits, and overall the treatment didn’t change key virus‑related markers or prevent disease in most participants.

Utility 2
pubmed 2009

[Effect of continuous blood purification and thymosin alpha1 on the cellular immunity in patients with severe sepsis: a prospective, randomized, controlled clinical trial].

Li. Yi-nan YN; Zhou. Li-xin LX; Qiang. Xin-hua XH; Yu. Tie-ou TO; Mao. Ke-jiang KJ; Feng. Bin B; Wen...

In a small ICU trial, giving the immune‑boosting peptide thymosin‑alpha‑1 (1.6 mg under the skin each day for a week) helped improve immune cell numbers and reduced severity scores in patients with severe sepsis, especially when combined with continuous blood‑purification treatments.

Utility 2
pubmed Feb 28, 2019

The effect of thymopentin add-on in hepatitis B e antigen positive chronic hepatitis B after virus suppression by peginterferon plus entecavir therapy.

Ma. Yanpin Y; Bao. Xuli X; Xiong. Fang F; Wang. Jinhuan J; Gu. Na N; Guo. Jia J; Wu. Huili H; Lu. Ju...

Adding the peptide thymopentin (TP5) to the usual hepatitis B drugs (entecavir and pegylated interferon) was safe and seemed to speed up the drop in the hepatitis B surface antigen in some patients, especially those who already had low levels of the antigen. In lab cells, TP5 worked together with interferon to cut down the virus's hidden DNA form.

Utility 2
pubmed 2008

Efficacy of triple therapy with thymalfasin, peginterferon alpha-2a, and ribavirin for the treatment of hispanic chronic HCV nonresponders.

Poo. Jorge L JL; Sánchez Avila. Francisco F; Kershenobich. David D; García Samper. Xochitl...

In a small open‑label trial, adding the peptide thymosin‑alpha‑1 (thymalfasin) to the standard hepatitis C drugs peginterferon‑alpha‑2a and ribavirin helped about half of the participants clear the virus during treatment, and roughly one‑fifth kept the virus cleared after 24 weeks off therapy. The peptide was well tolerated and didn’t need dose cuts.

Utility 2
pubmed 2004

Combination transcatheter hepatic arterial chemoembolization with thymosin alpha1 on recurrence prevention of hepatocellular carcinoma.

Shuqun. Cheng C; Mengchao. Wu W; Han. Chen C; Feng. Shen S; Jiahe. Yang Y; Wenming. Cong C; Peiun. W...

Adding the immune‑boosting peptide thymosin‑alpha‑1 after liver cancer surgery, together with a standard chemo‑embolization treatment, didn’t cut the chance of the cancer coming back, but it seemed to push the relapse back by a few months and helped patients live a bit longer.

Utility 2
pubmed 1989

[Electron microscopic study of internalization stages of cellular receptors for insulin and alpha-1-thymosin].

Marinova. Ts Ts; Nenov. V V

The study used electron microscopy to watch how the receptors for insulin and the peptide thymosin‑alpha‑1 first attach to their cells and start to be pulled inside. It found that the very early steps look a lot alike for both hormones, but there are some subtle differences in how the receptor spots group together and begin internalizing.

Utility 2
pubmed 1983

Thymosin peptides and lymphokines do not directly stimulate adrenal corticosteroid production in vitro.

Vahouny. G V GV; Kyeyune-Nyombi. E E; McGillis. J P JP; Tare. N S NS; Huang. K Y KY; Tombes. R R; Go...

The study found that thymosin-alpha-1 and related thymosin peptides do NOT directly cause rat adrenal cells to make more steroid hormones in a dish, and they don't boost the cells' response to ACTH. Any steroid increase seen in living animals is probably due to brain signals, not a direct adrenal effect.

Utility 2
pubmed 2000

Changes in thymosin-alpha(1)content in patients with nonspecific gynecologic diseases depending on inflammation type and efficacy of antiinflammatory and immunomodulating therapy.

Shurlygina. A A; Litvinenko. G G; Dergacheva. T T; Trufakin. V V

The study shows that women with inflammatory gynecologic problems have different amounts of the immune‑modulating peptide thymosin‑alpha‑1 in their blood, and those levels change throughout the day. The pattern depends on what kind of inflammation they have and how well their treatment works, suggesting both the amount and timing of thymosin‑alpha‑1 matter for immune regulation.

Utility 2
pubmed 1992

Solid-phase syntheses of two deacetyl-thymosin alpha 1 analogues with substitution at position 21 and their effects on low E-rosette-forming lymphocytes of uremic patients.

Abiko. T T; Sekino. H H

Scientists made two slightly altered versions of the immune‑boosting peptide thymosin‑alpha‑1 and tested them on kidney‑failure patients with weak immune cells. The version that had a fluorine atom added (a fluorinated phenylalanine at position 21) helped the patients' immune cells recover better than the non‑fluorinated version, which performed about the same as the original peptide.

Utility 1
pubmed Sep 29, 2020

Thymosin alpha 1 in the prevention of infected pancreatic necrosis following acute necrotising pancreatitis (TRACE trial): protocol of a multicentre, randomised, double-blind, placebo-controlled, parallel-group trial.

Zhou. Jing J; Mao. Wenjian W; Ke. Lu L; Chen. Tao T; He. Wenhua W; Pan. Xinting X; Chen. Miao M; He....

Researchers are testing whether the immune‑boosting peptide thymosin‑alpha‑1 can lower the chance of infected pancreatic tissue in people with severe pancreatitis, but the study is still just a plan – no results are available yet.

Utility 1
pubmed Aug 19, 2022

Thymosin alpha 1 as an adjuvant to hyperthermic intraperitoneal chemotherapy in an experimental model of peritoneal metastases from colonic carcinoma.

Nevo. Nadav N; Lee Goldstein. Adam A; Bar-David. Shoshi S; Natanson. Maya M; Alon. Gilad G; Lahat. G...

In a mouse study, adding the immune‑boosting peptide thymosin‑alpha‑1 to a heated chemotherapy wash (HIPEC) for colon cancer spread helped the mice live longer, but the peptide didn’t directly kill tumor cells—it worked by turning on a specific type of immune response.

Utility 1
pubmed Sep 3, 2025

Efficacy of thymosin α1 for sepsis: a systematic review and meta-analysis of randomized controlled trials.

Gu. Bin B; Zhou. Yu Y; Nie. Yao Y; Wang. Luhao L; Liang. Liqun L; Liao. Zihuai Z; Wen. Jingyi J; Gua...

Thymosin‑alpha‑1 might lower death rates in people with severe infections (sepsis), but the evidence is mixed and the studies aren’t big enough to be sure. The benefit seems to vary by health condition, and the data aren’t strong enough to change everyday health routines.

Utility 1
pubmed Feb 4, 2025

Hypofractionated radiotherapy combined with a PD-1 inhibitor, granulocyte macrophage-colony stimulating factor, and thymosin-α1 in advanced metastatic solid tumors: a multicenter Phase II clinical trial.

Yu. Jiamin J; Yin. Li L; Guo. Wenjie W; Wang. Qiang Q; Liu. Juying J; Zhang. Lansheng L; Ye. Hongxun...

A small Phase II trial tested a mix of radiation, a PD‑1 cancer drug, GM‑CSF, and the peptide thymosin‑alpha‑1 in people with advanced cancers. About a quarter of patients saw tumor shrinkage and many had disease stabilization, with some showing distant tumor shrinkage (abscopal effect). Side effects were mostly mild to moderate, with a few serious events. The results are promising for cancer treatment but don’t give clear guidance for healthy individuals looking to boost immunity or longevity.

Utility 1
pubmed 2020

Pharmacological and Genomic Approaches in Management of Cystic Fibrosis.

Qadir. Muhammad Imran MI; Yameen. Iqra Ali IA

The abstract explains that cystic fibrosis is caused by a faulty CFTR gene, leading to thick mucus and lung problems. Researchers are trying gene therapy and other methods to fix the ion channel issue, and they mention thymosin‑alpha‑1 as a possible molecule that could help correct the defect, but no clear protocol or dosage is given.

Utility 1
pubmed Mar 12, 2023

Adenovirus infection diagnosed by metagenomic next-generation sequencing after haploidentical hematopoietic stem cell transplantation: A multicenter study in China.

Wu. Qiong Q; Wu. Yanjun Y; Zhao. Ye Y; Zhang. Yanming Y; Cao. Junjie J; Wu. Depei D; Zhou. Juying J;...

In a large group of stem‑cell transplant patients, only a few got a serious adenovirus infection that was found using DNA sequencing. The infection hit multiple organs and was usually fatal, even with antiviral drugs and immune‑boosting treatments. One patient also received thymosin‑α1, but it didn’t clearly change the outcome.

Utility 1
pubmed Jun 17, 2022

Immune enhancement in patients with predicted severe acute necrotising pancreatitis: a multicentre double-blind randomised controlled trial.

Ke. Lu L; Zhou. Jing J; Mao. Wenjian W; Chen. Tao T; Zhu. Yin Y; Pan. Xinting X; Mei. Hong H; Singh....

A big study gave patients with severe pancreatitis a drug called thymosin‑alpha‑1 to see if it would lower a dangerous infection in the pancreas. The drug didn’t cut the infection rate or improve other serious complications compared to a placebo, so it didn’t show any real benefit in this setting.

Utility 1
pubmed Mar 6, 2025

The Effect of Ulinastatin on Sepsis Outcomes: An Umbrella Review of Meta-Analysis.

Cao. Sheng S; Han. Ping P

This review looked at studies where a drug called ulinastatin, sometimes mixed with the peptide thymosin‑alpha‑1, was used to treat people with severe infections (sepsis). It pooled results from several meta‑analyses to see if these combos helped patients live longer, need less time on a ventilator, or spend less time in the ICU. The data are mixed and mainly apply to sick hospital patients, not healthy individuals looking to boost longevity or performance.

Utility 1
pubmed Mar 8, 2024

Evaluation of the efficacy and safety of a precise thymalfasin-regulated PRaG regimen for advanced refractory solid tumours: protocol for the open-label, prospective, multicentre study (PRaG5.0 study).

Kong. Yuehong Y; Chen. Rongzheng R; Xu. Meiling M; Zhang. Junjun J; Chen. Guangqiang G; Hong. Zhihui...

This study is a planned clinical trial that will test whether adding thymosin‑alpha‑1 (thymalfasin) to a combo of radiotherapy, a PD‑1/PD‑L1 cancer drug, and GM‑CSF can improve outcomes for people with hard‑to‑treat solid tumors. It’s still just a protocol—no results yet—so it doesn’t give any concrete tips you can use right now.

Utility 1
pubmed May 20, 2022

Hypofractionated Radiation Therapy Combined With Weekly Chemotherapy in Patients With Unresectable or Recurrent Thymic Epithelial Tumor: A Prospective, Single-Arm Phase 2 Study (GASTO-1042).

Chu. Chu C; Liang. Ying Y; Lin. Xiaosheng X; Liu. Yimei Y; Liu. Songran S; Guo. Jinyu J; Wang. Daqua...

This study tested a cancer treatment that combined precise radiation, weekly chemo, and a small dose of the peptide thymosin‑alpha‑1 in patients with hard‑to‑treat thymus tumors. The regimen showed good tumor shrinkage and survival, with very low rates of serious lung inflammation, and the peptide might have helped protect the lungs and keep quality of life stable. However, the findings are specific to cancer patients and not directly useful for everyday health‑hacking or longevity goals.