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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.
Franco. F J FJ; Diaz. C C; Barcia. M M; Arias. P P; Gomez-Marquez. J J; Soriano. F F; Mendez. E E; F...
Scientists found that a protein called prothymosin alpha, which includes the short peptide thymosin‑alpha‑1 at its start, is naturally made and released by thymus cells in calves and rats. Bigger thymus cells make more of it, but all cell types release similar amounts.
Christenson. L L; Aebischer. P P; Galletti. P M PM
Scientists grew mouse thymus cells, put them inside a special filter that lets hormones out but blocks immune attacks, and showed they kept making the immune‑boosting peptide thymosin‑alpha‑1 for several days. This hints that a tiny implant could someday help people with weak immune systems, but it’s far from a DIY supplement or treatment you can use now.
Giraud. F F; Fabien. N N; Auger. C C; Girod. C C; Loire. R R; Monier. J C JC
The study examined thymic tumor tissue and found that thymosin‑alpha‑1 is present in most of these tumors, but the patterns of other markers were mixed and didn’t line up with traditional tumor classifications, making the findings mostly academic and not useful for everyday health hacks.
Schuurman. H J HJ; Krone. W J WJ; Broekhuizen. R R; van Baarlen. J J; van Veen. P P; Golstein. A L A...
The study looked at thymus tissue from AIDS patients and found it was severely shrunken, just like in other immune disorders, and only a few HIV proteins were present. It also showed that some HIV antibodies stick to thymosin‑alpha‑1, but this doesn’t fully explain the findings, and there’s no clear link to how the peptide works in the body.
Hiramine. C C; Hojo. K K; Koseto. M M; Nakagawa. T T; Mukasa. A A
Scientists created a mouse thymus cell line that makes thymosin‑alpha‑1 and can form special nurse‑cell structures while also causing certain thymus cells to die, but the work is purely laboratory‑based and doesn’t give any guidance on using the peptide in people.
Zaidi. S A SA; Kendall. M D MD; Gillham. B B; Jones. M T MT
A lab study found that fluids taken from rat thymus glands can make the pituitary release the hormone LH, but the specific peptide thymosin‑alpha‑1 did not have this effect. The LH boost depended on potassium and calcium and only worked with young or enlarged thymus tissue, not with older thymus.
Nicolas. J F JF; Auger. C C; Dardenne. M M; Thivolet. J J
The study shows that human and mouse skin cells don’t naturally make the thymic hormones thymosin‑alpha‑1, thymopoietin, or FTS/thymulin, meaning any boost from these peptides has to come from outside the body, not from the skin itself.
Zatz. M M MM; Oliver. J J; Sztein. M B MB; Skotnicki. A B AB; Goldstein. A L AL
The study found that a thymus extract (TF5) can boost a key immune signal (IL‑2) in lab‑grown human blood cells, but this boost isn’t caused by the well‑known peptide thymosin‑alpha‑1. The real active ingredient is still unknown, so the result doesn’t give a clear way to use thymosin‑alpha‑1 for health benefits.
Wilson. G B GB; Paddock. G V GV; Floyd. E E; Newell. R T RT; Dopson. M H MH
The paper shows that a peptide called thymosin‑alpha‑1, found in certain leukocyte extracts, can help T‑cells rebuild a specific surface receptor and may boost immune activity in a couple of patients with immune deficiency, but the work is early‑stage lab work, not a clinical protocol.
Monroe. W E WE; Roth. J A JA; Grier. R L RL; Arp. L H LH; Naylor. P H PH
A study in adult dogs found that giving bovine growth hormone helped the thymus (an immune organ) look more like that of a young dog, but it didn’t change white‑blood‑cell counts and actually lowered the blood level of the peptide thymosin‑alpha‑1. The control dogs got some thymus regeneration too, and there was no difference in thymosin‑alpha‑1 between groups.
Bayard. P P; Monjour. L L
The study shows that the malaria parasite Plasmodium falciparum has proteins that look a lot like some human immune proteins, including thymosin‑alpha‑1, which could help the parasite hide from the immune system. This is a basic science finding and doesn’t give any direct advice on how to use thymosin‑alpha‑1 for health or performance.
Roth. J A JA; Kaeberle. M L ML; Grier. R L RL; Hopper. J G JG; Spiegel. H E HE; McAllister. H A HA
In a study on dwarf dogs with a weak immune system, giving them growth hormone for a month helped them look healthier and made the thymus (an immune organ) bigger, but it didn’t change the levels of thymosin‑alpha‑1 in their blood or improve how their immune cells responded to tests. The dogs already had normal thymosin‑alpha‑1 levels before treatment.
Socinski. M A MA; Ershler. W B WB; Frankel. J P JP; Albertini. R J RJ; Ciongoli. A K AK; Krawitt. E...
A rare case showed a patient with both red‑blood‑cell failure and muscle weakness linked to a thymus tumor, and this patient also had higher levels of thymosin‑alpha‑1 in the blood. The study is just a single report and doesn’t give any new ways to use the peptide for health improvement.
Reuben. J M JM; Hersh. E M EM; Mansell. P W PW; Newell. G G; Rios. A A; Rossen. R R; Goldstein. A L...
The study measured a natural protein called thymosin‑alpha‑1 in a group of young men who had many sexual partners, infections, and drug use. These men showed weaker immune responses and higher levels of thymosin‑alpha‑1 compared to heterosexual men, and those who also had Kaposi’s sarcoma were even more immunodeficient. The research suggests the protein rises when the immune system is already compromised, but it doesn’t test giving the peptide as a treatment.
Haynes. B F BF; Warren. R W RW; Buckley. R H RH; McClure. J E JE; Goldstein. A L AL; Henderson. F W...
The paper examined thymus tissue from children with severe immune disorders and found that the surface markers on thymic cells are abnormal, but the peptide thymosin‑alpha‑1 is still present in these tissues. It doesn’t test taking the peptide as a supplement, so there’s no new guidance for using it to boost health or performance.
Nicolas. J F JF; Dardenne. M M; Faure. M M; Gaucherand. M M; Gagneraut. M C MC; Thivolet. J J; Bach....
Scientists found that human skin cells release a substance that helps immature T‑cells mature, but this substance is not the same as the well‑known peptide thymosin‑alpha‑1. The activity peaks when the skin cells start to form layers, and it works independently of certain prostaglandins.
Kreiss. J K JK; Lawrence. D N DN; Kasper. C K CK; Goldstein. A L AL; Naylor. P H PH; McLane. M F MF;...
Researchers measured immune markers in people with hemophilia and their spouses. They found that a few hemophiliacs had antibodies to a virus linked to AIDS, their beta‑2‑microglobulin levels were higher than normal, but thymosin‑alpha‑1 levels were mostly normal with a few high outliers. It’s unclear if any of these numbers predict later disease.
Zielasek. J J; Burkart. V V; Naylor. P P; Goldstein. A A; Kiesel. U U; Kolb. H H
In a study on diabetes‑prone rats, giving the immune protein IL‑2 helped prevent diabetes in one rat strain but made it worse in another. The strain that got worse had higher natural levels of thymosin‑alpha‑1, while the strain that improved had lower levels. This hints that thymosin‑alpha‑1 might affect how the immune system influences diabetes, but the work is in rats and not directly usable for people.
Ho. A D AD; Stehle. B B; Birr. C C; Heinzel. W W; Nebe. T C TC
Scientists tested short pieces of the peptide thymosin‑alpha‑1 on newborn (cord blood) T‑cells and found that one fragment (amino acids 13‑19) works about as well as the whole peptide, changing an enzyme (5'NT) and a surface marker (OKT4). This is early lab work and doesn’t translate into a clear human dosing or health protocol.
Wang. Lin L; Guo. Cheng-shan CS; Hou. Ming M; Li. Li-zhen LZ; Zhang. Chun-qing CQ; Chen. Feng F; Qin...
Adding the peptide thymosin‑alpha‑1 to a short high‑dose dexamethasone course helped more patients with newly diagnosed immune thrombocytopenia reach a full response and stay in remission longer than dexamethasone alone, with changes in immune‑signalling proteins that suggest a shift toward a more balanced immune response.