April 4, 2026
TB-500 Dosing Protocol: The Complete Guide to Thymosin Beta-4
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before using any peptide or research compound.
TB-500 is one of the most versatile recovery peptides available — but if you search for a TB-500 dosing protocol online, you'll find numbers all over the map. 2 mg, 5 mg, weekly, twice weekly, loading phase, no loading phase. The variation is frustrating, and it matters. This guide gives you the actual numbers used in clinical research and reported consistently by experienced users, along with the full injection protocol, the BPC-157 stack breakdown, and a realistic timeline for what to expect.
What Is TB-500 (Thymosin Beta-4)?
TB-500 is the synthetic form of Thymosin Beta-4 (Tβ4), a naturally occurring 43-amino-acid peptide found in virtually every cell of the human body. Its role in tissue repair has been documented in research going back decades.
What makes TB-500 peptide useful to biohackers:
- Actin upregulation: TB-500 sequesters actin monomers, regulating the actin cytoskeleton. Cell migration — how repair cells reach damaged tissue — is actin-dependent. More available actin means faster migration to injury sites.
- Cell migration and differentiation: Promotes movement of endothelial cells, keratinocytes, and fibroblasts into damaged tissue — the building blocks of new tissue.
- Systemic anti-inflammatory: TB-500 downregulates inflammatory cytokines and reduces oxidative stress. It operates systemically — not just locally — which is why it's used for chronic inflammation even without an acute injury.
- Angiogenesis: Promotes new blood vessel formation into damaged or ischemic tissue, improving the blood flow that rate-limits recovery.
TB-500 Dosing Protocol
The standard TB-500 dosing protocol follows a two-phase structure: a loading phase to build therapeutic concentration, followed by maintenance to sustain the effect.
| Phase | Dose | Frequency | Duration |
|---|---|---|---|
| Loading | 2–2.5 mg | Twice per week | 4–6 weeks |
| Maintenance | 2–2.5 mg | Once/week or once/2 weeks | 4–8 weeks |
Loading phase (weeks 1–6): 2–2.5 mg injected twice per week, spaced 3–4 days apart (e.g., Monday/Thursday). This builds tissue saturation faster. Most people start at 2 mg and only increase if response seems blunted.
Maintenance phase (week 7+): Drop to 2–2.5 mg once weekly or once every two weeks. At this point you're sustaining the effect, not building it.
Note on individual variation:
Individual response varies with TB-500 more than with many peptides. Body weight, injury severity, and baseline inflammation level all affect optimal Thymosin Beta-4 dosage. Start at 2 mg and adjust based on response — there's no benefit to pushing higher without clear reason.
Injection Protocol
SubQ vs. IM
| Method | Notes | Best For |
|---|---|---|
| SubQ | Into fatty tissue just below the skin | Standard — easier to self-administer |
| IM | Directly into muscle belly | Preferred by some for faster absorption |
SubQ is the standard recommendation. TB-500 works systemically — you don't need to inject near the injury — so SubQ into the abdomen or thigh covers it. Use a 27–29 gauge insulin syringe.
Reconstitution
TB-500 ships as lyophilized (freeze-dried) powder. Use bacteriostatic water (BAC water) to reconstitute — not sterile water. BAC water contains 0.9% benzyl alcohol, which prevents contamination and extends refrigerated shelf life.
Standard reconstitution (5 mg vial):
- Draw 2 mL of BAC water into a syringe
- Inject BAC water slowly against the inside wall of the vial (don't aim directly at the powder)
- Swirl gently — do not shake (shaking degrades the peptide)
- Result: 2,500 mcg/mL — a 2 mg dose = 0.8 mL; a 2.5 mg dose = 1.0 mL
- Store refrigerated at 2–8°C; use within 30 days
Step-by-Step SubQ Administration
- 1Wash hands thoroughly
- 2Clean injection site (abdomen or thigh) with an alcohol swab
- 3Pinch a fold of skin and fatty tissue
- 4Insert the needle at a 45-degree angle, bevel up
- 5Inject slowly and steadily
- 6Withdraw needle and apply light pressure with a clean swab
- 7Rotate sites to avoid tissue buildup
BPC-157 + TB-500 Stack ("The Wolverine Stack")
The BPC-157 TB-500 stack is one of the most consistently discussed protocols in the biohacking and recovery community. The two peptides work through complementary mechanisms — together they cover more repair pathways than either does alone.
| Peptide | Primary Mechanism | Best For |
|---|---|---|
| BPC-157 | Angiogenesis, GH receptor upregulation, gut protection | Local tissue repair, gut, tendon/ligament |
| TB-500 | Actin regulation, cell migration, systemic anti-inflammatory | Systemic recovery, muscle, broad inflammation |
Stack Dosing Protocol:
Loading phase (weeks 1–6):
- TB-500: 2–2.5 mg, twice per week (SubQ)
- BPC-157: 250–500 mcg, once daily (SubQ)
Maintenance phase (weeks 7–12):
- TB-500: 2–2.5 mg, once per week or once every 2 weeks
- BPC-157: 250 mcg, once daily
You can inject both in the same session — separate syringes, separate sites. No evidence of interaction requiring spacing.
Cycle Length
- Weeks 1–6: Loading phase (2–2.5 mg, 2x/week)
- Weeks 7–12: Maintenance phase (2–2.5 mg, 1x/week or 1x/2 weeks)
- Weeks 13+: Cycle off for 4–8 weeks before repeating
For acute injuries, some run a shorter 4-week loading phase and assess. For chronic conditions or longevity use, a full 10–12 week cycle is more common. TB-500 is not typically run continuously year-round.
What to Expect
TB-500 is not a painkiller. It accelerates underlying repair — which means the timeline is weeks, not days.
Weeks 1–2
Subtle effects for most users. Some report reduced baseline inflammation and improved sleep quality. Acute injuries may show early reduction in swelling and improved range of motion.
Weeks 3–4
Where most users notice meaningful change. Chronic pain patterns may shift. Training recovery improves. Consistently sore tissue starts to feel more neutral.
Weeks 4–6 (end of loading phase)
The clearest window of effect. If TB-500 is going to work for your specific use case, you should have solid signal by here. Full tissue repair takes longer, but the trajectory should be clear.
Sourcing Notes
TB-500 quality varies significantly between vendors. The peptide research market is unregulated — purity, accurate dosing, and contamination are real concerns.
Non-negotiables when evaluating a source:
- Third-party Certificate of Analysis (COA) — HPLC purity above 98%
- Mass spectrometry verification — confirms the correct peptide sequence
- US-based or reputable international vendors with verifiable testing history
- Avoid pre-mixed vials — reconstitute from powder yourself; pre-mixed peptides degrade before you inject
Ready to Dive Deeper?
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Frequently Asked Questions
What is the standard TB-500 dosing protocol?
The standard TB-500 dosing protocol uses a loading phase of 2–2.5 mg injected subcutaneously twice per week for 4–6 weeks, followed by a maintenance phase of 2–2.5 mg once weekly or once every two weeks. Total cycle length is typically 10–12 weeks.
How long does TB-500 take to work?
Most users notice initial effects — reduced inflammation, improved recovery — within weeks 2–3. The full effect of the loading phase is typically felt by weeks 4–6. Acute injuries may respond faster than chronic conditions.
Can you stack TB-500 with BPC-157?
Yes — the BPC-157 + TB-500 combination (often called the "Wolverine Stack") is one of the most commonly used peptide stacks. They work through complementary mechanisms: BPC-157 targets local tissue repair and angiogenesis; TB-500 targets systemic anti-inflammation and cell migration. Standard stack: TB-500 at 2–2.5 mg 2x/week (loading) + BPC-157 at 250–500 mcg/day.
Is TB-500 injected subcutaneously or intramuscularly?
Both routes are used, but subcutaneous (SubQ) injection is the standard recommendation. TB-500 works systemically, so proximity to the injury is not required. SubQ into the abdomen or thigh with a 27–29 gauge insulin syringe is the most common approach.
What is the difference between TB-500 and BPC-157?
Both are recovery peptides, but they work differently. TB-500 (Thymosin Beta-4 fragment) primarily works through actin regulation and cell migration, producing broad systemic anti-inflammatory and regenerative effects. BPC-157 (Body Protection Compound-157) operates more locally, promoting angiogenesis and growth hormone receptor upregulation — particularly effective for tendon, ligament, and gut healing. They're complementary, which is why they're commonly stacked.
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