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Thymosin alpha-1 was discovered in 1977. Since then, people have claimed it could help with health conditions ranging from infections to cancer and even psoriatic arthritis (PsA).
Although thymosin alpha-1 may affect immune function and inflammation, there’s no solid evidence that it can help PsA symptoms.
Here’s what you should know about thymosin alpha-1 if you’re considering it for PsA.
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Thymosin alpha-1 is a peptide (a short chain of amino acids) your body makes naturally. It’s made of 28 amino acids, which are the building blocks of proteins. Peptides can bind to cells and tell them to do specific things.
Your thymus gland makes thymosin alpha-1. The thymus is part of your lymphatic system. It produces T cells (a type of white blood cell), which play a crucial role in defending you against infection and other diseases. Thymosin alpha-1 is recognized for its role in immune function and inflammation.
Thymosin alpha-1 has shown promise for HIV and other infections. It’s also been studied to slow tumor growth in some types of cancer, such as lung and liver cancers. Researchers have studied thymosin alpha-1 in several types of studies, but the evidence is still limited or uncertain for many conditions.
The synthetic form of the naturally occurring peptide thymosin alpha-1, thymalfasin (Zadaxin), is approved in several countries, mainly for chronic hepatitis B. Other approved uses vary by country.
In the United States, the U.S. Food and Drug Administration (FDA) has not approved either thymalfasin or thymosin alpha-1 to treat any condition. It received FDA orphan drug designations, which are given to drugs being developed to treat rare diseases, for several conditions between 1991 and 2006.
Scientists have studied thymosin alpha-1 in connection with a variety of immune conditions, infections, and cancers, including:
Research on PsA hasn’t tested thymosin alpha-1 as a potential treatment. It has only measured how much thymosin alpha-1 people with PsA naturally have.
Researchers don’t fully understand how thymosin alpha-1 works. Studies have observed its ability to stimulate the immune system and T cells. T cells are white blood cells that help your body fight infection and cancer.
Thymosin alpha-1 can affect immune system activity by interacting with myeloid cells, a group of cells that develop from stem cells in the bone marrow. Thymosin alpha-1 can also influence T-cell activity, helping regulate the immune response.
Thymosin alpha-1 also interacts with dendritic cells. Dendritic cells are found all over the body. They can stimulate an immune response by showing antigens (foreign substances) to T cells and other immune cells. Thymosin alpha-1 can stimulate this response, which can help your body fight infectious diseases.
Thymosin alpha-1 changes the production of certain cytokines (signaling proteins) that can enhance the immune response. Some studies suggest it may reduce inflammation by affecting certain cytokines, such as interleukin-1 beta (IL-1 beta) and tumor necrosis factor-alpha (TNF-alpha), which promote inflammation. This may be beneficial for people who are immunocompromised.
To date, no clinical trials have studied thymosin alpha-1 therapy as a treatment for PsA. Researchers think thymosin alpha-1 may benefit people with PsA because of the role it plays in stimulating the immune system and controlling inflammation. However, there’s no information on how taking thymosin alpha-1 might affect PsA symptoms.
One study compared serum levels of thymosin alpha-1 in healthy people and those with PsA. The researchers found that people with PsA had significantly lower levels of thymosin alpha-1 than those without the disease.
In the same study, PsA treatment was linked to higher thymosin alpha-1 levels when researchers looked at all people with autoimmune diseases together. However, they did not find a treatment-related difference specifically among people with PsA. This means the study did not show that PsA treatment raised thymosin alpha-1 levels.
Thymosin alpha-1 has been shown to alter levels of the inflammatory cytokines TNF-alpha and interleukins in lab experiments. These are some of the same molecules that cause inflammation in people with PsA.
Many common biologic treatments for PsA work by blocking TNF-alpha, IL-17, or IL-23 to reduce inflammation. Thymosin alpha-1’s effects on immune signaling suggest it might help reduce inflammation in PsA, but this has not been tested in clinical trials.
There’s no standard or approved dose of thymosin alpha-1 for treating PsA. In some studies, thymosin alpha-1 is given as a solution twice a week by subcutaneous (under-the-skin) injection.
For countries where thymalfasin is used, dosing recommendations may vary. In the U.S., thymosin alpha-1 is not FDA-approved for any condition, but it has been studied in clinical trials. However, there are currently no clinical trials recruiting people with PsA to use thymosin alpha-1.
Some compounding pharmacies may prepare thymosin alpha-1, but compounded products are not FDA-approved. The FDA has raised concerns that these products could cause immune reactions, contain impurities, or be difficult to test for safety and quality. Whether a pharmacy can legally compound thymosin alpha-1 also depends on federal compounding requirements.
Thymosin alpha-1 has generally been well tolerated in clinical studies for other conditions, but its safety in people with PsA hasn’t been established.
Some studies have reported the following health problems in people receiving thymosin alpha-1, but it’s not always clear whether the drug caused them:
At this time, there’s not enough clinical evidence to support the use of thymosin alpha-1 for PsA. More research is needed to confirm whether this drug is safe and effective in treating PsA. Talk to your doctor or rheumatologist to learn more about thymosin alpha-1 therapy and future research.
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Thank you for the article. Near the end you mentioned people who are immunosuppressed should not take TA1, can you elaborate as to why not?
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Great insights on Thymosin Alpha-1 and its role in immune system peptide research. SunGod Labs provides high-purity compounds for reliable and consistent scientific studies.
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