TB-500: the complete guide.

The short version.

If you read nothing else, read this. The whole guide in a handful of bullets.

Quick reference.

What is TB-500?

TB-500 is a short peptide, which simply means a small chain of amino acids, the same building blocks that make up the proteins in your body. It is a synthetic copy of the active region of a natural protein called Thymosin Beta-4, which your body already produces.

Thymosin Beta-4 plays a role in cell repair and movement. It is found in high concentrations in wound fluid and in tissues that are actively healing. Researchers isolated the part of the molecule that seems responsible for that repair activity, and TB-500 is the lab-made version of that piece.

The version sold by vendors arrives as a freeze-dried white powder in a small sealed vial. It is not a steroid, not a hormone, and not a stimulant. People reach for it because it is studied for one theme above all: helping the body recover and move better, especially after the kind of injuries that normally heal slowly.

Worth saying plainly: TB-500 is not an approved medicine anywhere. It is sold strictly for research use only, and the strongest human evidence is actually on the full-length Thymosin Beta-4 protein in topical and eye formulations, not this injectable fragment. We get into what that means further down.

How it works in the body.

You do not need a biology degree to follow this. Here is the simple picture, then a little more for the curious.

The core idea is that TB-500 works with the body's own repair machinery, and unlike a local-acting peptide it travels through the bloodstream and acts body-wide. It does this through a few overlapping mechanisms that show up repeatedly in the research.

• Actin regulation. Thymosin Beta-4 binds actin, the protein that lets cells build their internal scaffolding and migrate. By helping cells move to where they are needed, it is studied for speeding the repair of damaged tissue.
• New blood flow (angiogenesis). It is studied for encouraging the growth of tiny new blood vessels into an area, which brings more oxygen, nutrients, and repair signals to tissue that is trying to heal.
• Calmer inflammation. It appears to help dial down excess inflammation, which is part of why people associate it with faster recovery and better range of motion after hard training or an injury.

How to take it: routes of administration.

TB-500 is an injectable peptide. Unlike BPC-157, it is not a meaningful oral option, so the real choice is just where you inject. Here is the honest comparison.

Where to inject.

If you go this route, these are the sites people use. Rotate so no single area gets sore.

The easiest spots are the belly (about 2 inches either side of the navel), the love handles, the front of the thigh, and the back of the upper arms. Rotate every injection.

So which should a beginner pick? For almost everyone, subcutaneous is the answer: absorption is reliable, the needle is tiny, and because TB-500 works through the whole body, you do not need to inject at the injury to benefit. Intramuscular is an option if you specifically want to target an area, but it is not necessary.

Reconstitution: mixing it.

TB-500 arrives as a dry powder, so before you can inject it you reconstitute it, which just means adding liquid to turn the powder into something you can draw into a syringe. It sounds technical but takes about a minute.

Once it is mixed, the only real question is how many units to draw. That depends on your vial size, your water amount, and your target dose, and it is easy to get wrong by hand.

• Use bacteriostatic water, often called BAC water. The small amount of preservative keeps the mixed vial usable for weeks.
• Add the water slowly, down the inside wall of the vial. A common mix is a 10 mg vial plus 2 mL of BAC water, which gives a concentration of 5 mg/mL.
• Swirl, do not shake. Gently roll the vial until the powder dissolves. Shaking can damage the peptide.
• Store it in the fridge once mixed, and keep it out of direct light.

Open the dosage calculator to turn your vial and dose into an exact number of units. As a worked example: a 10 mg vial mixed with 2 mL of BAC water gives 5 mg/mL, so a 2.5 mg dose is 0.5 mL, which is 50 units on a U-100 insulin syringe, and that vial holds about 4 doses.

Dosing by goal.

There is no single official dose for TB-500, because it is not an approved medicine. What follows is the range people commonly run, organized by phase. The defining feature of TB-500 dosing is the loading-then-maintenance pattern.

Loading phase

The most common starting pattern is about 2.5 mg twice a week, for roughly six weeks. The idea is to build the peptide up while you are actively working through an injury or a hard training block.

Maintenance phase

After the loading weeks, people typically drop to about 2.5 mg once a week to maintain the effect, rather than continuing at the higher frequency. Some stop entirely once they feel recovered.

Stacked with BPC-157

TB-500 is very often run alongside BPC-157, the so-called Wolverine pairing. The TB-500 schedule stays the same; BPC-157 is dosed daily in mcg, so the two are on different rhythms but run in the same block.

Cycling and timing.

A cycle just means a defined run of time on the peptide, followed by a break. For TB-500 the common pattern is a loading phase of roughly six weeks, then a lighter weekly maintenance dose, then time off, rather than running it indefinitely.

Why not just run it forever? Mostly because the long-term human safety data does not exist yet. The cautious and widely followed approach is to run a focused block while you are recovering, then stop.

• Hold the schedule through your loading weeks, twice a week, at roughly even spacing.
• Step down, do not just quit cold if you want to maintain, moving to once weekly after the loading phase.
• Take a real break after a cycle before considering another. If symptoms return, that is a conversation for a licensed provider.

Stacking TB-500.

TB-500 is rarely run alone. It is one half of the most popular recovery pairing in the whole peptide world.

See full recipes, dosing, and how people run them on the stacks page.

Side effects and safety.

In the reports we see, TB-500 is generally described as well tolerated, with side effects that tend to be mild and temporary when they show up at all. The ones people mention most often are:

• Fatigue or tiredness, sometimes reported in the first days of a cycle.
• Head rush or lightheadedness shortly after a dose.
• Injection-site irritation, a little redness or a small bump, which is why rotating sites matters.
• Temporary flu-like feeling that some people describe early on.

Who should be cautious.

Some people have clear reasons to be extra careful, or to avoid TB-500 entirely until they have spoken with a licensed provider.

• Pregnant or breastfeeding. There is no safety data here, so this is a hard avoid.
• A history of cancer, or active cancer. Because TB-500 is studied for promoting new blood vessel growth, which tumors also rely on, caution is widely advised. This is a conversation for an oncologist, not a forum.
• Competing athletes. TB-500 is banned by WADA and will show up as a prohibited substance.
• Anyone on other medications. If you take prescription drugs or manage a chronic condition, talk to your provider first.

And the universal one: whoever you are, talk to a licensed healthcare provider before starting TB-500. This guide is educational, not a substitute for personalized medical advice.

Where to buy it safely.

This is where a lot of beginners get burned, because peptide quality varies wildly between vendors and the cheapest vial is not always the real deal. Our honest take: do not shop on price alone, shop on price plus independent lab data.

• Compare vendors side by side. Price ranges are wide, and the difference between the lowest and highest listing can be large for the exact same compound.
• Look for recent third-party lab tests. The gold standard the community looks for is a recent Janoshik certificate of analysis showing purity for the batch you are actually buying.
• Favor recent COAs. An old lab result on a different batch tells you little. The fresher the test, the more it means.
• Be skeptical of suspiciously cheap listings with no testing behind them.

That is exactly the comparison we put together. On our TB-500 product page you can compare vendor prices, see which batches have public lab data, and view the grades we assign from that data. From there you can head to the buy page to line up your options.

Questions, answered straight.