Ac-SDKP dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
Ac-SDKP is the first four building blocks of thymosin beta-4. It is a natural peptide that fights scarring inside organs. The enzyme ACE breaks it down, which is why ACE-inhibitor blood pressure pills raise it. There are animal data and human measurements. It is sold as capsules that probably do not survive digestion.
Evidence grade for Ac-SDKP: 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
2 effects reported, 2 unwanted, by people using it, not a trial
Goal pages: Injury, healing and recovery, Immune system and inflammation, 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.
Ac-SDKP is a small peptide your body already makes. It helps limit scarring inside organs. Blood pressure pills called ACE inhibitors raise your own levels. It is sold as a capsule, which probably does not survive your stomach.
What people take it for
- Reducing scarring in the heart, kidneys or lungs.
- Recovery, as a thymosin beta-4 fragment.
What studies in people showed
Nobody has been given the peptide in a study. In people, ACE-inhibitor blood pressure pills raise its blood levels. In animal models, it fought scarring in the heart, kidney and lung. In rats, it cut inflammation after brain injury. Once in the blood, it is cleared within minutes.
What people report
Reports, not study results
The good
- We have not collected user reports on this one yet.
The bad
- No evidence it survives digestion.
- It is cleared from the blood within minutes.
Where these come from: The findings come from the reviews and rat study on this page. We have no user reports.
My bottom line
A capsule of this probably never reaches your blood. If you want more of it, an ACE inhibitor does it, and that is a doctor's call.
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
35 of the 36 indexed goals have no study of any kind behind Ac-SDKP
No study in people, animals or cells on this page reports a result for these. That does not prove Ac-SDKP does nothing for them. It does mean anything you have heard about Ac-SDKP and one of these did not come from a study cited here.
Show full evidence
What is Ac-SDKP?
Ac-SDKP is the first four building blocks of thymosin beta-4. It is a natural peptide that fights scarring inside organs. The enzyme ACE breaks it down, which is why ACE-inhibitor blood pressure pills raise it. There are animal data and human measurements. It is sold as capsules that probably do not survive digestion.
Ac-SDKP is made in your body and limits scarring in heart, kidney and lung models. People taking ACE-inhibitor blood pressure pills have more of it in their blood, which is well documented. Animal studies support effects against scarring and inflammation. As a product, it is sold as a swallowed TB-4 fragment capsule. But ACE clears it from the blood within minutes, and there is no evidence it is absorbed when swallowed.
How does Ac-SDKP work?
It slows the cells that lay down scar tissue and cuts collagen build-up. The blood pressure enzyme ACE breaks it down.
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, 2015 to 2021, counted from the list of sources on this page.
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
- 487.5 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 Ac-SDKP, so none is drawn rather than guessed from a name.
The studies we cite
- Review of studies2021Investigating the antifibrotic potential of N-acetyl seryl-aspartyl-lysyl-proline sequence peptides
A review of animal studies. It fought organ scarring consistently in animal models.
Consistent anti-fibrotic effects in animal models.
- Review of studies2015Effect of ACE inhibitors on Ac-SDKP levels: systematic review and meta-analysis
A review that pooled human studies. ACE-inhibitor blood pressure pills raise Ac-SDKP in the blood. Nobody was given the peptide itself.
ACE inhibition raises circulating Ac-SDKP in humans.
- Animal study2017Ac-SDKP in traumatic brain injury model
In rats. It cut inflammation after brain injury.
Reduced inflammation after injury in rats.
Where to buy Ac-SDKP
No seller we track lists Ac-SDKP 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 Ac-SDKP been tested in people?
Not in any study cited here. Ac-SDKP is the first four building blocks of thymosin beta-4. It is a natural peptide that fights scarring inside organs. The enzyme ACE breaks it down, which is why ACE-inhibitor blood pressure pills raise it. There are animal data and human measurements. It is sold as capsules that probably do not survive digestion.
What is the Ac-SDKP 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 Ac-SDKP FDA-approved?
Not approved
Does an Ac-SDKP capsule work?
There is no evidence the peptide survives digestion. And once in the blood, ACE clears it within minutes.