Thymulin dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
Thymulin is a thymus hormone that needs zinc to work. It is studied for immune ageing, swelling and pain, mostly in the lab and in animals.
Evidence grade for Thymulin: Animal or lab only. The rule: only animal or lab studies on this page. No study in people yet. The sum on this page: 1 animal study, no human study. A grade counts how much has been done to people, not whether it works.
- People given it
- 0
- Human studies
- 0
- Found nothing
- 0
Dose
No human dose established
No published study on this page has given this compound to people and reported a result.
1 animal study, no human study
1 effects reported, 1 unwanted, by people using it, not a trial
Goal pages: Injury, healing and recovery, Immune system and inflammation, Bone and joints, Gut health
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.
Thymulin is a hormone from the thymus that only works when zinc is attached. Low zinc and ageing both lower its activity. With zinc, it helps T cells mature. It is studied for immune ageing, swelling and pain. It is not approved.
What people take it for
- Support for an ageing immune system.
- Less pain and swelling.
What studies in people showed
There are no human studies on this page. Since nobody can patent it, nobody is likely to pay for one. In rats, a thymulin copy called PAT cut pain and swelling caused by a bacterial toxin, more so at higher doses.
What people report
Reports, not study results
The good
- We have not collected user reports on this one yet.
The bad
- There are no human studies on this page, so its side effects in people are not known here.
Where these come from: There are no user reports or human studies on this page to draw from.
My bottom line
The zinc link is the useful part. If you worry about your immune system as you age, check your zinc in blood work before you chase a peptide.
An opinion, not a finding. I am a coach, not a doctor.
What it has been measured to do
Animal and lab work, not yet tested in people
Real results, but from animals or cells, not people. What works in a mouse often does not work the same way in a person. Nobody can patent this, so nobody would ever earn back the cost of a study in people. That is usually why there is none.
- Inflammation1 animal or lab study
34 of the 36 indexed goals have no study of any kind behind Thymulin
No study in people, animals or cells on this page reports a result for these. That does not prove Thymulin does nothing for them. It does mean anything you have heard about Thymulin and one of these did not come from a study cited here.
Show full evidence
What is Thymulin?
Thymulin is a thymus hormone that needs zinc to work. It is studied for immune ageing, swelling and pain, mostly in the lab and in animals.
Thymulin is a thymus hormone nine building blocks long. It only works when zinc is attached. Without zinc it does nothing. That is why low zinc and ageing lower its activity, and why people study it in immune ageing. With zinc attached, it helps T cells mature and work better. It has also been studied for pain and swelling. There are no human studies on this page. In rats, a thymulin copy called PAT cut pain and swelling caused by a bacterial toxin, more so at higher doses. Human evidence for treatment is limited, and it is not FDA-approved.
How does Thymulin work?
With zinc attached, it helps T cells mature and calms swelling signals.
The evidence, in charts
Fig. 1a · how many people
0people have taken this in any study cited here
0 people · 0 studies in people
What this page cites instead is 1 animal study and 2 reviews. None of them gave the compound to a person.
Counted from the list of sources on this page. We draw this chart only when a study in people is cited. An empty one is the answer, not a gap in the page.
Fig. 1b · evidence mix
None of the 3 sources here are studies in people.
- Animal study · done in animals133%
- Review of studies · sums up other studies267%
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, 1989 to 2014, counted from the list of sources on this page. The newest source on file is from 2014, 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
- 857.9 Da
- Half-life
- Stated in words, not a numbersee the exact wording below
- Chain length
- None on file
No amino acid sequence is on file for Thymulin, so none is drawn rather than guessed from a name.
The studies we cite
- Review of studies1989Thymulin, a zinc-dependent hormone
A review. Thymulin only works with zinc attached. It helps T cells mature and makes some groups of T cells work better.
Thymulin's activity and antigenicity depend on bound zinc; it induces T-cell differentiation and enhances T-cell subset functions.
- Review of studies2014Physiology and therapeutic potential of the thymic peptide thymulin
A review of how the brain and hormone system control thymulin, and of the pain and swelling relief seen with it and its copy.
Reviews thymulin's neuroendocrine regulation and the anti-inflammatory and analgesic effects of thymulin and its analogue.
- Animal study2002Potent analgesic and anti-inflammatory actions of a novel thymulin-related peptide in the rat
In rats. A thymulin copy called PAT cut pain and swelling caused by a bacterial toxin, more so at higher doses.
A thymulin analogue (PAT) dose-dependently reduced endotoxin-induced hyperalgesia and inflammation in rats.
Where to buy Thymulin
16 sellers list Thymulin in our latest read. They are ranked by trust score, then by archive rating, then by certificate tier, then by the lowest price per milligram. Archive evidence is counted before source-backed. Each path is out of 4, and the two are not added. A higher price does not raise the score. The letter is the certificate chip. 0 of them have a published certificate that names Thymulin.
Some seller links may pay this site when you buy through them. A payment never changes a seller's tier or rank, and no seller has a say in any page.
| Seller | Trust score | Vial sizes | From, per mg | Certificate for Thymulin | Seller link |
|---|---|---|---|---|---|
| BioLongevity Labs | 85 StrongSource-backed 4 of 4. Archive evidence 3 of 4.A | 10 mg | $6.50 | None found for Thymulin | View |
| Peptide Plugs | 65 FairSource-backed 4 of 4. Archive evidence 2 of 4.A | 20 mg | $2.00 | None found for Thymulin | View |
| PeptidePlugs | 65 FairSource-backed 4 of 4. Archive evidence 2 of 4.A | 20 mg | $2.00 | None found for Thymulin | View |
| Supernova Sciences | 65 FairSource-backed 3 of 4. Archive evidence 2 of 4.A | 10 mg | $6.00 | None found for Thymulin | View |
| Limitless Bio-Tech | 52 FairSource-backed 1 of 4. Archive evidence 1 of 4.C | 10 mg | $3.75 | None found for Thymulin | View |
| True Lab Peptides | 49 WeakSource-backed 3 of 4. Archive evidence 2 of 4.A | 10 mg, 20 mg | $2.95 | None found for Thymulin | View |
| Luxe Peptides | 49 WeakSource-backed 3 of 4. Archive evidence 2 of 4.A | 10 mg | $4.00 | None found for Thymulin | View |
| Peptify Labs | 49 WeakSource-backed 3 of 4. Archive evidence 2 of 4.A | 10 mg | $5.20 | None found for Thymulin | View |
| Limitless Biotech Peptides | 43 WeakSource-backed 1 of 4. Archive evidence 1 of 4.C | 10 mg | $1.90 | None found for Thymulin | View |
| Oath Research | 40 WeakSource-backed 1 of 4. Archive evidence 1 of 4.C | 5 mg, 10 mg | $6.50 | None found for Thymulin | View |
| Canlab International | 37 WeakSource-backed 1 of 4. Archive evidence 1 of 4.C | 20 mg | $5.50 | None found for Thymulin | View |
| Limitless Biotech ST | 36 WeakSource-backed 1 of 4. Archive evidence 1 of 4.C | 10 mg | $2.00 | None found for Thymulin | View |
| Southern Aminos | 29 InsufficientSource-backed 4 of 4. Archive evidence 1 of 4.Letter withheld | 10 mg | $10.0 | None found for Thymulin | View |
| AMC Essentials | 16 InsufficientSource-backed 1 of 4. Archive evidence 0 of 4.Letter withheld | 10 mg | $4.00 | None found for Thymulin | View |
| Tydes | 15 InsufficientSource-backed 1 of 4. Archive evidence 0 of 4.Letter withheld | 10 mg | $5.50 | None found for Thymulin | View |
| Skye Peptides | 0 InsufficientSource-backed 3 of 4. Archive evidence 1 of 4.Letter withheld | 10 mg | $5.90 | None found for Thymulin | View |
- LC Lab-confirmed: the issuing laboratory echoed this certificate back
- A Current certificate, independent laboratory named, laboratory not yet checked
- B Certificate published, but no laboratory link, older than a year, or the laboratory did not recognise the published lookup
- C No certificate could be read
Every listing and vial size for Thymulin · How the trust score is counted
Sellers named on the price pages are ranked by certificate tier, then price, and any affiliate income is disclosed there. Naming a seller is not a recommendation to buy or use anything.
Common questions
Has Thymulin been tested in people?
Not in any study cited here. Thymulin is a thymus hormone that needs zinc to work. It is studied for immune ageing, swelling and pain, mostly in the lab and in animals.
What is the Thymulin dosage?
No human dose established. No published study on this page has given this compound to people and reported a result. 1 animal study, no human study
Is Thymulin FDA-approved?
Not FDA-approved
Why is thymulin linked to zinc?
Thymulin only works when zinc is attached. Low zinc or ageing lowers its activity, which is part of why it is studied in immune ageing.