Thymopentin dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
Thymopentin is a five-part piece of a thymus hormone, used in some countries to tune the immune system.
Evidence grade for Thymopentin: Moderate. The rule: at least one finished study in people, and at least 100 people who took it. The sum on this page: 3 completed trials, 306 people given it. A grade counts how much has been done to people, not whether it works.
- People given it
- 306
- Human studies
- 3
- Found nothing
- 1
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
3 completed trials, 306 people given it
3 effects reported, 1 unwanted, 2 wanted, by people using it, not a trial
Goal pages: Immune system and inflammation
In plain English
In plain English, from Aaron
This is how I would explain it to a friend. The evidence, with the numbers, is further down the page.
Thymopentin is a lab-made copy of the active part of a thymus hormone. It is five building blocks long. It helps T cells develop and tunes the immune system. Some countries have used it for weak immunity and autoimmune disease. It is not approved in the US.
What people take it for
- Calming eczema.
- Keeping immune cells up.
- Preventing infections after surgery.
What studies in people showed
The biggest study had 206 people having cancer surgery. Infections afterwards hit 17.5 percent on the drug and 24.3 percent without it. That gap is small enough to be chance, so it did not work for that. In older patients only, it kept immune cell counts from dropping after surgery. In 100 people with eczema, six weeks of daily shots cut how much skin was affected and how bad it was, compared with a dummy shot. In adults with HIV and no symptoms, people on it kept a higher share of CD4 immune cells over 24 weeks. That is a blood marker, and it was before modern HIV drugs.
What people report
Reports, not study results
The good
- In 100 people with eczema, the skin got better than on a dummy shot.
- People with HIV on it kept more of their CD4 immune cells.
The bad
- It did not clearly prevent infections after cancer surgery.
- The studies on this page do not list side effects, and we have not collected user reports on this one yet.
Where these come from: Everything here is from the three human studies on this page. We have not collected forum or user reports for this one yet.
My bottom line
It has one real win in eczema and one clear miss in surgery. Neither is a reason to take it for general health.
An opinion, not a finding. I am a coach, not a doctor.
What it has been measured to do
Measured in people
Goals Thymopentin has been tested for in people, biggest studies first. We count only what the studies on this page say, so the real numbers may be higher.
- Immune function206 people · 2 studies · 1 found nothing
35 of the 36 indexed goals have no study of any kind behind Thymopentin
No study in people, animals or cells on this page reports a result for these. That does not prove Thymopentin does nothing for them. It does mean anything you have heard about Thymopentin and one of these did not come from a study cited here.
Show full evidence
What is Thymopentin?
Thymopentin is a five-part piece of a thymus hormone, used in some countries to tune the immune system.
Thymopentin is a lab-made peptide five building blocks long. It copies the active part of thymopoietin, a thymus hormone. It helps T cells develop and tunes the immune system. It has been used in some countries for weak immunity, autoimmune diseases and to boost other treatments. The biggest study had 206 people having cancer surgery. Infections after surgery were 17.5% on thymopentin and 24.3% without it, a gap small enough to be chance. In 100 people with eczema, six weeks of daily shots cut how much skin was affected and how bad it was, compared with a dummy shot. In adults with HIV and no symptoms, people on it kept a higher share of CD4 immune cells over 24 weeks. It is not FDA-approved, but its medical history is clearer than that of many research peptides.
How does Thymopentin work?
It copies the active part of thymopoietin. That helps T cells mature and keeps the immune system in balance.
The evidence, in charts
Fig. 1a · how many people
306people, across 2 studies in people cited here
| Study | People | Share |
|---|---|---|
| British Journal of Surgery 1994 | 206 | 67% |
| Journal of Allergy and Clinical Immunology 1990 | 100 | 33% |
One study holds 67% of these people, so the total rests more on one study than its size suggests. Counts are the number of people each study on this page says it signed up. That includes studies that only watched people and gave nobody the compound. 1 more study in people gives no headcount and is not counted here. Studies still signing people up are left out, and only studies cited on this page are counted.
Fig. 1b · evidence mix
All 3 sources here are studies in people.
- Study in people · done in people3100%
Counted from the list of sources on this page. It counts only what we cite, so there may be more studies out there. A review counts once, however many studies it sums up.
Fig. 2 · evidence over time
The studies cover 3 different years, 1990 to 1994, counted from the list of sources on this page. The newest source on file is from 1994, more than five years ago. Research on it may have gone quiet.
Fig. 3 · legal status at a glance
US
Not approved
UK
Not approved
AU
Not approved
CA
Not approved
Not approved in any of the four countries shown. This is what the law says, not a verdict on the science. See Legal status below for the full text and any notes.
Fig. 4 · how much does what
Nobody has tested different amounts in people
This chart would show how the effect changes as the amount goes up. For this compound, nobody has measured that in people. So we leave it empty. We will not borrow an animal chart and pretend it works the same in people.
Fig. 5 · what the molecule is
- Kind of compound
- Peptide
- Molecule weight
- 679.8 Da
- Half-life
- About 1 minutesUltra-short, minutes
- Chain length
- None on file
No amino acid sequence is on file for Thymopentin, so none is drawn rather than guessed from a name.
The studies we cite
- Study in people1990Thymopentin therapy reduces the clinical severity of atopic dermatitis
In eczema, this one beat a dummy injection. A hundred people had a daily shot under the skin for six weeks, half of them the drug and half a dummy, and nobody involved knew which. The treated group finished with less skin affected and milder disease. A hundred people over six weeks is a decent first answer, not a final one. Nothing here says what happens if you keep taking it, or how it compares with the creams people actually use.
100-patient double-blind trial: daily subcutaneous thymopentin for 6 weeks reduced disease extent and severity versus placebo.
- Study in people1992Maintenance of CD4+ cells by thymopentin in asymptomatic HIV-infected subjects: results of a double-blind, placebo-controlled study
People kept more of a key immune cell, and that is all this shows. Adults with HIV who had no symptoms were given thymopentin or a dummy injection for about six months, and nobody involved knew which. Those on the drug held on to a higher share of CD4 cells, the cells HIV destroys. That is a blood marker, not how anyone felt or how long they lived. This was done before modern HIV treatment existed.
Thymopentin-treated asymptomatic patients maintained higher CD4+ cell percentages over 24 weeks.
- Study in people1994Impact of thymopentin on the incidence and severity of postoperative infection: a randomized controlled trial
It was tested properly for preventing infections after cancer surgery and it did not work. Two hundred and six patients were split by chance around the time of their operation. Infections happened slightly less often on thymopentin, and the gap was small enough that chance explains it. Infections were no less severe overall either. Among the older patients only, the drug did hold up immune cell counts that otherwise fell after surgery, and their infections were less severe. That is a finding about one group, found after the fact.
206 cancer surgery patients randomised to perioperative thymopentin or control, all receiving antibiotic prophylaxis and postoperative parenteral nutrition. The trial missed on its main question: the postoperative infection rate was 17.5 percent on thymopentin against 24.3 percent on control, not significant, and the mean sepsis score was 6.7 against 9.4, also not significant. In the elderly subgroup thymopentin prevented the postoperative fall in CD3 and CD4 positive T cells seen in controls (p < 0.05) and the sepsis score was lower, 6.9 against 11.3. The authors conclude it did not significantly reduce the infection rate.
Where to buy Thymopentin
No seller we track lists Thymopentin yet. We read sellers’ public product lists every week, and this section fills in as soon as one does. Every seller, graded
Common questions
Has Thymopentin been tested in people?
Yes. 306 people given it across 3 completed trials cited here, 1 of which found nothing. Thymopentin is a five-part piece of a thymus hormone, used in some countries to tune the immune system.
What is the Thymopentin dosage?
No human dose established. Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose. 3 completed trials, 306 people given it
Is Thymopentin FDA-approved?
Not FDA-approved (used in some countries)
Is thymopentin the same as thymosin alpha-1?
No. Both come from thymus research, but they are different molecules from different thymus hormones. Thymosin alpha-1 is approved in more countries.