TB-500 Dosage: Protocols, Units, Cycle Length

TB-500 Dosage: What the Protocols Actually Say

Nearly every TB-500 dosing scheme you will encounter follows the same two-phase shape. A loading phase first: somewhere between 2 and 2.5 mg injected subcutaneously twice a week, kept up for four to six weeks. Then a maintenance phase: a similar injection once a week, once every two weeks, or once a month, continued for as long as the user intends to keep going. Some versions scale the loading dose to body weight, quoting 2 mg for smaller users and 2.5 mg or more for larger ones. Others compress the schedule into a single larger weekly injection.

It is worth being precise about what these numbers are. They are circulating research protocols: conventions that formed on bodybuilding forums and gray-market vendor pages over roughly fifteen years, passed along until repetition made them look authoritative. No clinical trial produced the 2.5 mg figure. No published study compared twice-weekly loading against any alternative. The pattern survives because it is what everyone else quotes, which is a mechanism for consistency, not for correctness. This page describes those protocols so you can recognize them for what they are, not because PeRx endorses or prescribes them.

Why There Is No Official TB-500 Dose

TB-500 is the compounding name for synthetic thymosin beta-4, a 43-amino-acid peptide your body already produces in platelets, white blood cells, and wound fluid. Its day job is holding a reserve pool of actin, the protein cells use to build internal scaffolding and crawl toward injury sites, which is why the research interest centers on tissue repair. The TB-500 pillar guide Read nextTB-500 Peptide: What It Is and How It WorksTB-500 is a lab-made fragment of thymosin beta-4, a protein nearly every cell in your body uses to move repair machinery to where damage is. This guide covers what TB-500 actually is, the actin mechanism behind it, what the research does and does not show, side effects, and why it reaches patients only inside prescribed combination vials.Read article covers that biology in full; what matters here is the shape of the human evidence, because it explains the dosing vacuum.

Goldstein AL, Hannappel E, Kleinman HK. "Thymosin beta4: actin-sequestering protein moonlights to repair injured tissues." Trends in Molecular Medicine. 2005;11(9):421-429. View study

Every human trial in this space studied full-length thymosin beta-4 in development programs aimed at specific medical indications, mostly eye surface repair and cardiac protection, using routes and quantities that have nothing in common with a subcutaneous recovery protocol. The clearest example is the phase 1 safety study by Ruff and colleagues: healthy volunteers received intravenous synthetic thymosin beta-4 at 42, 140, 420, or 1260 mg, first as a single dose and then daily for 14 days. The drug was well tolerated across that entire range, which is genuinely useful safety information, and completely useless for choosing a milligram figure at the syringe. An IV dose of 42 mg is not a data point about 2 mg under the skin, and 1260 mg is five hundred times the forum loading dose.

Ruff D, Crockford D, Girardi G, Zhang Y. "A randomized, placebo-controlled, single and multiple dose study of intravenous thymosin beta4 in healthy volunteers." Annals of the New York Academy of Sciences. 2010;1194:223-229. View study

The efficacy programs never reached a completed confirmatory trial, so no dose was ever validated for any indication, let alone for tendon or muscle recovery in healthy adults. That is the whole story behind the missing number. Dose-finding is a formal process: escalating cohorts, predefined endpoints, a published curve relating dose to response. TB-500 skipped it entirely and went from animal studies to gray-market convention. When a prescribing clinic sets a dose anyway, it is exercising clinical judgment inside that evidence gap, which is exactly why the label, not a forum thread, has to be the number you follow.

How PeRx Doses TB-500: Inside the Combo

PeRx does not dispense TB-500 as a standalone vial. It ships inside a combination product with BPC-157 Explore PeRxBPC-157The Body Protection CompoundView peptide , because the two peptides are studied for complementary sides of the same repair process: BPC-157 for local signaling at the injury site, TB-500 for cell migration and inflammation regulation body-wide. The reasoning behind the pairing has its own guide Read nextWhy We Pair BPC-157 With TB-500BPC-157 and TB-500 are both repair peptides, but they cover different ground. BPC-157 works fast and focal, strongest at a specific injury and in the gut. TB-500 works broad and systemic, moving repair cells across the whole body. The pairing is not automatic. Here is how a provider decides whether you need both, or whether BPC-157 on its own does the job.Read article , and BPC-157 vs TB-500 Read nextBPC-157 vs TB-500: What Is the Difference?Both are recovery peptides. Both are popular. But they work through completely different biological mechanisms. BPC-157 sends the repair signals. TB-500 moves the construction crew into position. Understanding the difference tells you which one you actually need, and whether combining them is worth it.Read article walks through how the molecules differ. The dosing consequence is simple: the prescribed TB-500 dose at PeRx is defined by the blend.

Set the weekly arithmetic side by side with the forum pattern and the difference in philosophy shows. A circulating loading protocol at 2.5 mg twice a week puts 5 mg of TB-500 into the body in two large boluses. The PeRx protocol delivers 3 mg per week as five small daily doses, each accompanied by an equal amount of BPC-157, on a schedule that caps total exposure with a hard stop at six weeks. Smaller amounts, spread out, inside a bounded course, with pharmacy-tested material. Anyone who prefers to avoid needles entirely has the capsule form: BPC/TB-500 capsules carry 500 mcg of each peptide, taken as one capsule every morning on an empty stomach. Oral and injected milligrams are not interchangeable, so the two formats are different protocols, not two ways to hit one number.

BPC/TB-500

The vial TB-500 actually ships in at PeRx: 3 mg of TB-500 and 3 mg of BPC-157 per mL, prescribed by a licensed provider after a health screening and compounded at an FDA-registered 503A pharmacy with testing for potency and sterility.

The 5 mL vial ships fully reconstituted and ready to use, with insulin syringes and printed instructions in the box. Nothing is charged until the provider approves the prescription.

TB-500 at PeRx comes as the BPC/TB-500 blend, $299 per vial.

View BPC/TB-500

Units on an Insulin Syringe

The conversion takes one line. A U-100 insulin syringe holds 100 units per mL, so each unit is 0.01 mL. At 3 mg of TB-500 per mL, one unit carries 30 mcg. Divide a milligram dose by 0.03 to get units, or multiply units by 30 to get micrograms. The chart below runs the common figures, including the ones circulating protocols quote, so you can translate any number you have read into volume at this concentration.

Read the lower rows as translations, not as options. They exist so a dose quoted on a forum or another label makes sense in these units; the dose you inject is the one on your prescription, and at PeRx that is 20 units. The fourth column is the part standalone dosing pages leave out: this is a blend at equal concentrations, so every unit of TB-500 you draw brings the same amount of BPC-157 with it. Drawing 83 units to chase a forum loading dose would also quadruple the BPC-157 dose, which is one of several reasons improvising on a combination vial is a bad idea. A full walkthrough of the combined math, per-day and per-week totals included, lives in the BPC-157/TB-500 dosage chart Read nextBPC-157/TB-500 Dosage Chart: Units, mg, CycleThe prescribed BPC-157/TB-500 blend has one concentration and one dose, and every number on this page follows from those two facts. Draw 20 units and you get 0.6 mg of each peptide. Here is the full arithmetic: the dosage chart, units on an insulin syringe, per-day and per-week totals, how the capsules dose differently, and what a month actually costs.Read article . For needle technique and site choice, see where to inject TB-500 Read nextWhere to Inject TB-500: Sites and RotationTB-500 is a subcutaneous injection. One detail catches most people off guard: PeRx does not dispense TB-500 on its own. It comes pre-mixed with BPC-157 in a single ready-to-use vial, so "where to inject TB-500" is really "where to inject the BPC-157/TB-500 combo." The four standard subQ sites all work, and because this is a tissue-repair combination, there is a practical case for injecting near the injury when it makes sense. Here is the guide patients ask for after their first vial arrives.Read article and the general primer on how to take peptides Read nextHow to Take Peptides: Injection, Capsule, or StripMost prescription peptides are injected under the skin, a few are swallowed, and a small category dissolves under the tongue. This is the route-of-administration hub: why the route matters, exactly how a subcutaneous injection works, when each peptide is usually taken, what arrives in a PeRx kit, and a directory of per-peptide injection-site guides.Read article .

Cycle Length

The PeRx label is explicit: six weeks of Monday through Friday injections, then a six-week break before restarting, and never continuous use. At 20 units a day, five days a week, a six-week course is 30 injections and 18 mg of TB-500. A 5 mL vial holds 25 doses, so a full course runs one vial plus part of a second.

The bounded cycle is a direct answer to the evidence gap described above. With no human data defining safe long-term exposure to the compounded peptide, an equal off period keeps cumulative use capped at half the year, and it also matches how the peptide is supposed to be used: pointed at a specific injury with a defined recovery window, not run in the background indefinitely. Circulating protocols that maintain monthly injections for a year have no more evidence behind their duration than behind their dose. How on-off structures work across the catalog, and why some peptides cycle while others do not, is the subject of the peptide cycling guide Read nextPeptide Cycling Chart: When to Pause Each ClassPeptide therapy is rarely meant to run forever. Some peptides need scheduled breaks to keep working. Others can be used continuously. The right cycle depends on the peptide class, your goals, and what is happening at the receptor level. Here is the practical guide to cycling, peptide by peptide.Read article .

If You Miss a Dose

Skip it. Take your next scheduled injection at its normal time and do not draw extra to make up the difference. The protocol works through repeated small exposures across the course, so one missed weekday is a rounding error in a 30-dose cycle, while a doubled injection changes the one variable your prescription fixed. If you have missed several days in a row, message your care team through the contact page rather than improvising a catch-up schedule.

Two practical notes from the label while you are here. Do not take NSAIDs such as ibuprofen, naproxen, or aspirin during the cycle. And a brief lightheaded feeling after an injection can occur; sit or lie down until it passes, and seek medical attention if it lasts beyond 15 to 20 minutes or you faint.

TB-500 Dosage: Common Questions