Thymosin beta-4 has a smaller fragment from parts 17-23
TB-500, from thymosin beta-4, hasn't proved human healing
This fragment has seven of a larger protein's forty-three parts. Here you'll read what healing and heart tests found. The animals mostly received the larger protein. Those tests can't show whether the fragment helps your injury.
An evidence-intensity heatmap of the TB-500 and thymosin β4 literature — every finding graded by how hot the data actually run, the cardiac signal read first, and where compounded access truly stands.
Animal healing isn't proof for your injury
TB-500 is the fragment taken from parts 17–23 of thymosin beta-4. Your cells make the larger protein, thymosin beta-4, to help them work. The TB-500 fragment contains a part involved when cells move during repair. Here you can follow the tests, while TB-500's human benefit remains unproved.
Rat wounds given thymosin beta-4 grew 42% more new skin at 4 days and up to 61% more at 7 days than the wounds receiving salt-water treatment [3]. Mice also had better heart function after a vessel was tied shut [2]. These were animal changes, so they don't tell you how your injury would heal.
An X-ray study showed thymosin beta-4 holding another protein involved as cells move. Each held one partner, a pairing written as 1:1 [1]. The X-ray showed detail at 2 Å, a tiny length measured in angstroms. The joined proteins explain movement, without establishing whether treatment helps you safely.
The human safety test used the larger protein. Healthy people received thymosin beta-4 through a vein, up to 1260 milligrams [6]. In this Phase 1 early safety test, harm didn't force researchers to halt larger amounts. The findings don't settle whether the fragment works or is safe.
TB-500 is only one section of thymosin beta-4
The TB-500 fragment is one substance made in a lab. Thymosin beta-4 is the bigger protein from which the fragment is taken. Labs weigh the fragment at about 889 daltons, units too tiny for everyday scales. That weight describes size and can't settle your treatment benefit.
The substance names matter more than the weights. TB-500 refers to the small fragment in sales and sports testing. Its weight is about 889 daltons; the larger thymosin beta-4 weighs about 4963 daltons [5]. Healing studies mostly gave the bigger protein, and those gains remain unproved for the fragment [11].
A finding about thymosin beta-4 belongs to that larger protein. The fragment shares a part used in cell movement. One shared part can't establish that you get every full-protein effect from the fragment. You can't judge your likely benefit from the names alone.
TB-500 contains a section of the larger protein
Labs make TB-500 using parts 17–23 of thymosin beta-4. The full protein contains forty-three parts joined in a chain. The fragment's weight is about 889 daltons, tiny units used for lab weights. You're reading about one small fragment, with no proof that size predicts benefit.
The TB-500 name isn't a dose or strength
Thymosin beta is what the letters TB stand for. TB-500 names the lab-made thymosin beta-4 fragment for researchers and people treating animals. The full protein with forty-three parts has a different name. You can't use the name to work out strength or amount.
TB-500 healing work mainly tests animals and lab cells
Researchers study TB-500 and whole thymosin beta-4 with animals or with cells growing in laboratory dishes [5]. The studies look at wounds, injured hearts and brains, and new blood vessels. Cell movement matters because cells must reach an injured area for repair. These findings haven't led to an approved treatment for you.
Thymosin beta-4 has parts that the beta-4 fragment TB-500 lacks
Thymosin beta-4 is a protein with forty-three linked parts throughout your body, in almost all cells. Blood cells release thymosin beta-4 around an injury. The protein holds onto another protein used while a cell reshapes itself or moves. Each holds one partner, written as 1:1, which explains a step in cell movement [1].
A 2012 review gathered findings about repair [5]. Cells moved more, while scarring and inflammation were reduced in the studies. The researchers also saw more growth of blood vessels. The findings led to further work on eyes, wounds, hearts and brains, but don't establish your benefit.
Most repair findings concern whole thymosin beta-4. TB-500 contains the section used to hold another protein during cell movement. The whole protein can also release a different fragment that may affect scarring and vessel growth. TB-500 can't release that other fragment because the needed section is missing, leaving those actions unproved for you.
Mouse heart findings led to more repair studies
Mouse hearts showed changes after treatment with whole thymosin beta-4. Cells on the heart's surface became active and helped new vessels grow [7]. The protein also helped blood vessels form as mouse hearts developed [8]. You can read the gains and the failed tests on the TB-500 heart research page.
Healing and safety questions go beyond the heart. The TB-500 research page covers wounds, brain injuries, cancer concerns and BPC-157. The TB-500 study amounts page explains both the amounts tested and the unknown time in the body. For your TB-500 pharmacy questions, the TB-500 legal status page explains rules for pharmacies preparing your medicine and bans on sports drugs.
Personal reports can't show what caused a change
People discussing their own research use have reported changes. Those reports aren't accounts from a trial comparing treatments. The reported effects page covers both welcome changes and problems people described. Those experiences establish neither a treatment benefit nor an amount known to be safe.