Repair & Regeneration

TB-500 Dosage: Loading, Maintenance, and Timing (2026)

What the reported protocols say, what the science actually supports, and why the source of your peptide matters more than the number on the vial.

By the pru team · Updated July 9, 2026 · 7-minute read

Fit adult in their 30s doing calm mobility work on a mat, easing a healing shoulder through a slow stretch in bright home light — Image: pru

TB-500 has no FDA-approved dose. In the protocols people share online, it's usually run in two stages: a loading phase of about 4 to 6 mg per week, split into two subcutaneous shots for 4 to 6 weeks, then a maintenance phase of roughly 2 to 2.5 mg once a week.

TB-500 is a synthetic version of the active region of thymosin beta-4, a protein your body makes that binds actin and helps repair cells migrate into damaged tissue, which is why it's studied for recovery. It's a research peptide, so the source of your vial matters as much as the number on it. Read the safety and sourcing notes below.

What is a typical TB-500 dosage?

There's no official TB-500 dose, because no health agency has approved it. The protocols shared in athlete and biohacker circles follow a two-stage pattern: a higher loading phase to build tissue levels, then a lower maintenance phase to hold them. A common template is 4 to 6 mg per week during loading, split into two shots, then 2 to 2.5 mg once weekly to maintain.

How popular is TB-500?People search for TB-500 about 12,000 times a month in the US, a steadily searched peptide, and search interest is climbing fast (2026 search data). See the Peptide Popularity Report for the full ranking.

These figures come from animal research and shared experience. The table below describes what people report.

Phase	Weekly amount	How often	Duration
Loading	4 to 6 mg	2 shots per week	4 to 6 weeks
Maintenance	2 to 2.5 mg	Once per week	4 to 6 weeks
Low-dose upkeep	About 2 mg	Every 1 to 2 weeks	Ongoing in some protocols

Commonly reported TB-500 protocols (community and preclinical sources, not clinical guidance).

Read firstThymosin beta-4, the protein TB-500 is based on, is studied for tissue repair: it binds actin, supports the cell migration that closes wounds, and helps new blood vessels form. TB-500 carries the active region of that protein in an injectable form.

How does the TB-500 loading phase work?

The loading phase front-loads the dose to raise tissue levels faster. Reported protocols use about 4 to 6 mg per week, split into two subcutaneous injections of 2 to 3 mg each, run for 4 to 6 weeks.

The logic behind splitting the weekly amount is TB-500's short time in the bloodstream. Its plasma half-life is measured in hours, though its effects inside cells may last longer. Two smaller doses aim to keep levels steadier than one large weekly shot.

Typical loading: 2 to 3 mg per shot, twice a week
Total: roughly 4 to 6 mg per week
Length: 4 to 6 weeks before dropping to maintenance
Route: subcutaneous, into fatty tissue like the abdomen

What is the TB-500 maintenance dose?

After loading, reported protocols drop to a maintenance dose of about 2 to 2.5 mg once per week. The idea is to hold the tissue levels built during loading without the higher weekly total. Some long-run protocols go even lower, around 2 mg every one to two weeks.

Maintenance usually runs another 4 to 6 weeks, which makes a full reported cycle about 8 to 12 weeks.

How is TB-500 reconstituted and measured?

TB-500 ships as a freeze-dried powder that has to be mixed with bacteriostatic water before use. How much water you add sets the concentration, which changes how many units on the syringe equal your dose. Getting this math wrong is the most common dosing error.

Water added	Concentration	2 mg dose equals
1 mL	5,000 mcg/mL	0.4 mL (40 units)
2 mL	2,500 mcg/mL	0.8 mL (80 units)
2.5 mL	2,000 mcg/mL	1.0 mL (100 units)

Example concentrations for a 5 mg TB-500 vial. Bacteriostatic water only; store mixed vials refrigerated.

StorageOnce mixed, reconstituted peptide is generally reported stable for about 28 to 30 days refrigerated. A licensed pharmacy assigns a real beyond-use date. A grey-market vial gives you a guess.

How is TB-500 injected?

In reported protocols, TB-500 is injected subcutaneously, into the fatty layer just under the skin, using a small insulin syringe (about 28 to 31 gauge). The abdomen is the most common site. A few people use intramuscular injection near the injured area, but subcutaneous is the standard method people describe.

Syringe: insulin syringe, 28 to 31 gauge
Site: abdomen or other fatty area, rotated each time
Timing: shots are spread across the week, not clustered
Systemic idea: TB-500 is thought to circulate body-wide, so site is less critical than with some peptides

How long is a TB-500 cycle?

A full reported TB-500 cycle runs about 8 to 12 weeks: the loading phase followed by maintenance. Many protocols then call for a break of around 4 weeks before considering another cycle.

These windows are carried over from how people structure other peptide and hormone protocols. Longer or repeated cycles have not been studied for safety in people.

Athletic woman in her 30s easing back into a light jog on a park path at golden hour, relaxed and mid-recovery — Image: pru

What does the science actually support?

TB-500 is a synthetic peptide built around the active, actin-binding region of thymosin beta-4, a natural 43-amino-acid protein your body makes. Thymosin beta-4 has been studied for wound healing, blood-vessel growth, and calming inflammation. That's the source of TB-500's reputation for recovery.

Thymosin beta-4 has been studied in animal and lab models of wound healing, along with early human trials of the protein itself. In animal wound studies, it sped up skin repair meaningfully, acting through actin binding that moves repair cells into damaged tissue.

~15+

years of animal tissue-repair studies

Phase 2

stage reached by some thymosin beta-4 wound trials

FDA-approved human doses for TB-500

Pru estimates; no official count.

Is TB-500 dosing safe, and where's the real risk?

Reported side effects are usually mild: injection-site irritation, temporary tiredness, or head-rush type feelings. Longer-term risks and immune reactions in people have not been well studied.

The bigger risk today isn't the dose, it's the vial. Right now, TB-500 sold online is research-grade or grey-market: no prescriber checking whether it fits you, and no licensed pharmacy verifying what's actually inside or assigning a real expiration date. If you're weighing sourcing, start with where to buy TB-500 safely and the side effects guide before any number on a protocol.

The real cautionA community-sourced dose from an unverified vial stacks two unknowns. A physician and a licensed pharmacy remove one of them entirely: you at least know what's in the syringe.

How does pru handle TB-500?

pru is a telehealth platform for peptides. A licensed physician reviews fit, an FDA-regulated 503A pharmacy compounds and fills, and peptides are priced at cost with membership around $50 a month, itemized with no markup. You select the peptide with our guidance; the physician confirms it's appropriate.

pru does not offer TB-500 today. On April 15, 2026 the FDA removed TB-500 (and BPC-157) from the 503A Category 2 list, and the Pharmacy Compounding Advisory Committee reviews it on July 23 to 24, 2026 to weigh whether it can be compounded through 503A pharmacies. Removal from that list is not FDA approval, and TB-500 is not on the authorized 503A list yet. pru is preparing to offer TB-500 the right way, physician-prescribed and pharmacy-compounded, if and when that pathway opens.

For recovery support you can access today, pru's live GHK-Cu cream is a copper peptide studied for skin and tissue repair, available now. You can also browse the repair and regeneration catalog or read the best peptides for injury recovery. Being proactive about how you heal is a smart move, and pru exists to make that informed choice the accessible one: licensed physicians, pharmacy-grade medicine, and at-cost pricing. Take the next step whenever you're ready.

Ready when the pathway opens: see the live GHK-Cu cream and how pru membership works.

Common questions

What is the standard TB-500 dosage?

There isn't an official one, since TB-500 has no FDA-approved dose. The most commonly shared protocol uses a loading phase of about 4 to 6 mg per week, split into two shots for 4 to 6 weeks, then a maintenance dose of roughly 2 to 2.5 mg once weekly. These come from community practice and animal research.

How much TB-500 is in a loading dose?

Reported loading protocols use 4 to 6 mg per week, divided into two subcutaneous injections of about 2 to 3 mg each, run for 4 to 6 weeks before dropping to maintenance.

How often do you inject TB-500?

During loading, most protocols use two shots per week. During maintenance, it drops to once a week, sometimes once every two weeks. The split loading schedule reflects TB-500's short time in the bloodstream, its plasma half-life is measured in hours.

How do you reconstitute TB-500?

Mix the freeze-dried powder with bacteriostatic water. For a 5 mg vial, adding 1 mL gives 5,000 mcg/mL, 2 mL gives 2,500 mcg/mL, and 2.5 mL gives 2,000 mcg/mL. The amount of water sets your syringe units per dose, so the math matters. Mixed vials are generally kept refrigerated.

How long is a TB-500 cycle?

A full reported cycle runs about 8 to 12 weeks, loading plus maintenance, often followed by a break of around 4 weeks. These windows are carried over from how people structure other peptide protocols.

Is TB-500 dosing backed by clinical trials?

Most of the evidence comes from animal and lab studies of thymosin beta-4, the protein TB-500 is based on, plus early human trials of that protein. Thymosin beta-4 binds actin and supports the cell migration and blood-vessel growth that repair tissue, which is what it's studied for. TB-500 carries that active region in an injectable form, and it does not yet have FDA-approved human dosing.

Does pru offer TB-500?

Not today. The FDA removed TB-500 from the 503A Category 2 list on April 15, 2026, and the Pharmacy Compounding Advisory Committee reviews it on July 23 to 24, 2026. pru is preparing to offer it the right way, physician-prescribed and pharmacy-compounded, if and when that pathway opens. Its GHK-Cu cream for recovery is available now.

What's the real risk with TB-500 right now?

The dose uncertainty is real, but the bigger risk is the source. TB-500 sold online is research-grade or grey-market, with no prescriber and no licensed pharmacy verifying what's in the vial or assigning a true expiration date. A physician and a 503A pharmacy remove that unknown.

How does pru keep peptides affordable?

pru runs on an at-cost model. You pay one flat membership, and the medication is passed through at the pharmacy's price with no member markup. Because pru never marks the medication up, we have every reason to push its price down, not up. As pru grows and orders more, we negotiate lower pricing with our partner pharmacies, and those savings go straight to you. Healthcare pricing is usually hidden and inflated; pru is built to sit on your side of it: transparent, at cost, and fighting to make peptides more affordable as we scale.

Do the savings add up if I take more than one peptide?

Yes, and this is where pru's at-cost pricing saves you the most. Because pru never marks the medication up, every vial is priced at cost, so each peptide you add avoids the markup a typical provider builds in. If a physician has you on more than one peptide, or on a stack, that saving repeats on every vial, all under one flat $50 membership instead of a marked-up price on each. The more your protocol includes, the more the difference adds up, which makes doing it the right way a financially responsible choice, not an expensive one.

Sources & further reading

TB-500 Dosage: Loading, Maintenance, and Timing (2026)

What is a typical TB-500 dosage?

How does the TB-500 loading phase work?

What is the TB-500 maintenance dose?

How is TB-500 reconstituted and measured?

How is TB-500 injected?

How long is a TB-500 cycle?

What does the science actually support?

Is TB-500 dosing safe, and where's the real risk?

How does pru handle TB-500?

Related reading

Common questions

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