TB-500 Dosage Guide
Loading, maintenance, and cycling protocols for Thymosin Beta-4 fragment — reconstitution, injection technique, stacking with BPC-157, dosage by goal, and safety.
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TB-500
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What Is TB-500?
TB-500 is a synthetic peptide fragment of Thymosin Beta-4 (Tβ4), a naturally occurring 43-amino-acid protein found in nearly all human and animal cells. TB-500 corresponds to the active region of Tβ4 — specifically the actin-binding domain (amino acids 17–23) responsible for the protein's tissue repair and anti-inflammatory properties. By upregulating actin, TB-500 promotes cell migration, blood vessel formation (angiogenesis), and wound healing at an accelerated rate.
TB-500's primary appeal is its ability to support recovery from soft tissue injuries — tendons, ligaments, muscles, and skin. Unlike peptides that must be injected locally, TB-500 is a systemic peptide with a low molecular weight that distributes throughout the body after subcutaneous injection. This means a single injection in the abdomen can support healing in the shoulder, knee, or anywhere else. This guide covers loading and maintenance dosing, reconstitution, injection protocols, stacking with BPC-157, cycling, and safety considerations.
Use our Peptide Dosage to calculate your exact dose volume after reconstitution.
Key Characteristics:
- Thymosin Beta-4 fragment — synthetic peptide corresponding to the active region (amino acids 17–23) of the full 43-amino-acid Tβ4 protein
- Actin upregulation — promotes cell migration, proliferation, and differentiation by increasing the pool of available actin monomers for cytoskeletal remodeling
- Systemic distribution — low molecular weight allows body-wide distribution from a single injection site — no need to inject near the injury
- Anti-inflammatory — downregulates pro-inflammatory cytokines and modulates the inflammatory response at injury sites
- Angiogenesis — promotes the formation of new blood vessels, improving nutrient and oxygen delivery to damaged tissues
- Research peptide — sold for research purposes only; not FDA-approved for human use; banned by WADA and most professional sports organizations
For a complete overview of its mechanism and research, see our full TB-500 profile. New to peptides? Start with the Beginner's Guide to Peptides.
How TB-500 Dosage Is Determined
TB-500 dosing protocols are derived from animal studies on wound healing and tissue repair, veterinary use (particularly in equine medicine), and community experience from human self-experimentation. Unlike pharmaceutical drugs with FDA-established dosing, TB-500 dosing relies on a combination of preclinical research, veterinary protocols, and decades of anecdotal reports from the research peptide community.
Preclinical Research
The foundational research on Thymosin Beta-4 comes from studies on wound healing, cardiac repair, and neurological recovery in animal models. Researchers demonstrated that Tβ4 accelerates dermal wound closure, promotes cardiomyocyte survival after myocardial infarction, and supports axonal regrowth following central nervous system injury. These studies established the dose-dependent relationship between Tβ4 concentration and tissue repair outcomes.
Veterinary Protocols
TB-500 has been used extensively in equine veterinary medicine for soft tissue injuries, tendon repair, and muscle recovery in racehorses. Equine dosing protocols — scaled down by body weight — informed the loading/maintenance approach that is now standard in human research use. The two-phase protocol (high-frequency loading followed by lower-frequency maintenance) originates from these veterinary applications.
Community Experience & Practitioner Protocols
Over the past decade, the research peptide community has converged on a standard dosing range of 2–2.5 mg per injection, administered twice weekly during the loading phase and once weekly or biweekly during maintenance. This range was refined through extensive self-experimentation and shared reports across forums, practitioners, and clinics offering peptide protocols.
Standard TB-500 Dosage Ranges
TB-500 uses a two-phase dosing protocol: a loading phase at higher frequency to saturate tissue levels, followed by a maintenance phase at reduced frequency to sustain the effect. Dosing is in milligrams (mg) per injection.
Loading Phase
| Protocol | Dose per Injection | Frequency | Weekly Total | Duration |
|---|---|---|---|---|
| Conservative | 2 mg | 2x per week | 4 mg | 4–6 weeks |
| Standard | 2.5 mg | 2x per week | 5 mg | 4–6 weeks |
| Aggressive | 2.5 mg | 3x per week | 7.5 mg | 4 weeks |
Maintenance Phase
| Protocol | Dose per Injection | Frequency | Duration | Notes |
|---|---|---|---|---|
| Standard Maintenance | 2 mg | 1x per week | 4–8 weeks | Most common approach post-loading |
| Low-Frequency Maintenance | 2 mg | Every 2 weeks | 4–8 weeks | Suitable once injury has significantly improved |
| Extended Maintenance | 2.5 mg | 1x per week | 6–8 weeks | For chronic or slow-healing injuries |
Weight-Based Reference
| Body Weight | Loading Dose | Maintenance Dose | Notes |
|---|---|---|---|
| Under 150 lbs (68 kg) | 2 mg 2x/week | 2 mg 1x/week | Lower end of standard range |
| 150–200 lbs (68–90 kg) | 2.5 mg 2x/week | 2 mg 1x/week | Standard protocol for most users |
| Over 200 lbs (90 kg) | 2.5 mg 2x/week | 2.5 mg 1x/week | Upper end; some use 3x/week loading |
Calculate Your TB-500 Dose
After reconstituting your TB-500 vial, you need to calculate how much liquid to draw in your syringe for each dose. This depends on two things: the amount of peptide in the vial and the amount of water you added.
Worked Example:
- Vial size: 5 mg of TB-500 (lyophilized powder)
- Bacteriostatic water added: 2 mL
- Concentration: 5 mg ÷ 2 mL = 2.5 mg/mL
- For a 2.5 mg dose: draw 1 mL (100 units on an insulin syringe)
- For a 2 mg dose: draw 0.8 mL (80 units on an insulin syringe)
Second Example (10 mg Vial):
- Vial size: 10 mg of TB-500
- Bacteriostatic water added: 2 mL
- Concentration: 10 mg ÷ 2 mL = 5 mg/mL
- For a 2.5 mg dose: draw 0.5 mL (50 units)
- For a 2 mg dose: draw 0.4 mL (40 units)
Quick Reference Table
| Vial Size | BAC Water | Concentration | 2 mg Dose | 2.5 mg Dose |
|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 0.4 mL (40 units) | 0.5 mL (50 units) |
| 5 mg | 2 mL | 2.5 mg/mL | 0.8 mL (80 units) | 1.0 mL (100 units) |
| 10 mg | 2 mL | 5 mg/mL | 0.4 mL (40 units) | 0.5 mL (50 units) |
| 10 mg | 4 mL | 2.5 mg/mL | 0.8 mL (80 units) | 1.0 mL (100 units) |
Skip the Math — Use Our
Enter your vial size, water volume, and desired dose — get instant calculations with zero manual math.
TB-500 Reconstitution Guide
TB-500 arrives as a lyophilized (freeze-dried) powder that must be reconstituted with bacteriostatic water before injection. This process is simple but must be done correctly to preserve the peptide's integrity.
Supplies Needed:
- TB-500 vial (5 mg or 10 mg lyophilized powder)
- Bacteriostatic water (BAC water) — contains 0.9% benzyl alcohol to prevent microbial growth
- Insulin syringes (1 mL / 100 unit, 29–31 gauge)
- Alcohol swabs (70% isopropyl)
- Clean, flat workspace
Steps
Gather Supplies
You need: TB-500 vial (lyophilized powder), bacteriostatic water (BAC water), alcohol swabs, and an insulin syringe (1 mL / 100 units).
Wipe Vial Tops
Swab the rubber stopper of both the TB-500 vial and the BAC water vial with an alcohol pad. Let dry for 10 seconds.
Draw Bacteriostatic Water
Draw your chosen volume of BAC water into the syringe. For a 5 mg vial, 2 mL is a common choice (giving 2.5 mg/mL concentration). For a 10 mg vial, 2 mL gives 5 mg/mL.
Add Water to the Peptide Calculator Vial
Insert the needle through the rubber stopper and aim the stream of water down the inside wall of the vial — do not spray directly onto the powder. Let the water drip gently down the glass.
Swirl Gently — Never Shake
Roll the vial gently between your palms for 30–60 seconds until the powder is fully dissolved. The solution should be clear and colorless. Do not shake, as this can damage the peptide.
Label & Store
Label the vial with the date, peptide name, and concentration (e.g., “TB-500 — 2.5 mg/mL — Feb 20”). Store upright in the refrigerator (2–8°C). Use within 3–4 weeks.
Storage After Reconstitution
- Unreconstituted (powder): Refrigerate (2–8°C) for up to 12 months; freezer for longer storage
- Reconstituted (liquid): Refrigerate (2–8°C) and use within 3–4 weeks
- Never freeze reconstituted solution — ice crystals damage the peptide structure
- Always use bacteriostatic water — sterile water has no preservative and allows bacterial growth, reducing shelf life to 1–2 days
For a complete walkthrough with photos, see our How to Reconstitute Peptides guide.
TB-500 Dosage by Goal
While TB-500's mechanism is consistent across applications — actin upregulation, cell migration, and anti-inflammatory action — different injury types and goals may benefit from adjusted protocols in terms of loading duration, maintenance length, and whether to stack with other peptides.
Tendon & Ligament Injuries
Tendon and ligament injuries are the most common reason users reach for TB-500. These tissues have poor blood supply and heal slowly. TB-500's ability to promote angiogenesis (new blood vessel formation) and cell migration is particularly relevant here, as it helps deliver nutrients and repair cells to tissue that normally receives limited circulation.
- Loading: 2.5 mg twice per week for 6 weeks
- Maintenance: 2 mg once per week for 6–8 weeks
- Stacking: Commonly combined with BPC-157 for complementary healing pathways
- Timeline: Expect initial pain reduction at 2–4 weeks; structural improvement at 6–12 weeks
Muscle Strains & Tears
Muscle tissue has better blood supply than tendons, so TB-500 can work faster here. The peptide promotes satellite cell activation and muscle fiber repair, supporting recovery from strains, partial tears, and exercise-related muscle damage.
- Loading: 2–2.5 mg twice per week for 4 weeks
- Maintenance: 2 mg once per week for 4 weeks
- Stacking: Optional BPC-157 for localized support
- Timeline: Noticeable improvement in 2–3 weeks for mild to moderate strains
Joint Pain & Inflammation
TB-500's anti-inflammatory properties can help with chronic joint pain and synovial inflammation. It does not rebuild cartilage directly, but by reducing inflammation and promoting tissue repair in surrounding structures, it may improve joint comfort and function.
- Loading: 2 mg twice per week for 4–6 weeks
- Maintenance: 2 mg once per week or every 2 weeks for 6–8 weeks
- Stacking: Consider BPC-157 for joint-specific support
- Timeline: Pain reduction often noted within 2–4 weeks; sustained improvement over 8–12 weeks
Post-Surgical Recovery
Some practitioners use TB-500 to support recovery after orthopedic surgery (ACL repair, rotator cuff surgery, etc.). The loading phase is typically started 2–4 weeks after surgery, once initial surgical healing has stabilized. Discuss timing with your surgeon.
- Loading: 2.5 mg twice per week for 4–6 weeks (start 2–4 weeks post-surgery)
- Maintenance: 2 mg once per week for 6–8 weeks
- Stacking: Frequently combined with BPC-157
- Timeline: Results depend on surgical procedure; support is complementary to physical therapy
Hair Growth
TB-500 (via Thymosin Beta-4's mechanism) has been studied for its role in hair follicle stem cell migration and activation. Some users report improvements in hair density and regrowth with extended protocols. This is an off-label use with limited clinical evidence.
- Loading: 2 mg twice per week for 4 weeks
- Maintenance: 2 mg once per week for 3–6 months
- Stacking: Sometimes combined with GHK-Cu (topical) for additional follicular support
- Timeline: Hair growth is slow — expect 3–6 months before evaluating results
TB-500 Injection Guide
Subcutaneous Injection Protocol
TB-500 is administered via subcutaneous (SubQ) injection — meaning into the fat layer just beneath the skin, not into muscle. This is a simple, low-pain injection technique using a short insulin needle.
Wash Hands Thoroughly
Wash with soap and water for at least 20 seconds. Dry with a clean towel.
Prepare the Syringe
Swab the TB-500 vial stopper with an alcohol pad. Draw the calculated dose volume into an insulin syringe (29–31 gauge, 1 mL). Remove air bubbles by tapping the syringe barrel and gently pushing the plunger until a small drop appears at the needle tip.
Select & Clean the Injection Site
Common sites: abdomen (2 inches away from the navel), outer thigh, or the back of the upper arm. Swab the chosen site with an alcohol pad in a circular motion. Allow to dry for 10 seconds.
Inject Subcutaneously
Pinch a fold of skin between your thumb and forefinger. Insert the needle at a 45-degree angle into the skin fold. Push the plunger slowly and steadily. Withdraw the needle and release the skin fold. Do not rub the injection site.
Dispose of the Syringe Safely
Place the used syringe in a sharps container. Never recap a used needle. Never reuse syringes.
Why Systemic Injection Works (No Local Injection Needed)
TB-500 has a molecular weight of approximately 4,963 Da — small enough to distribute systemically through the bloodstream after subcutaneous injection. This is a key advantage: unlike some compounds that must be injected near the injury site, TB-500 reaches the target tissue regardless of where you inject. Studies on Thymosin Beta-4 demonstrate systemic bioavailability after subcutaneous administration.
Injection Timing
- Time of day: No strong evidence for a preferred time; most users inject in the morning or before bed for consistency
- Relative to meals: Can be injected on an empty or full stomach; SubQ absorption is not significantly affected by food
- Spacing: During loading (2x/week), space injections 3–4 days apart (e.g., Monday and Thursday, or Tuesday and Friday)
TB-500 Cycle Duration & Timing
TB-500 is not designed for indefinite continuous use. The standard approach uses a defined loading and maintenance cycle, followed by a break before reassessing whether another cycle is needed.
Loading vs. Maintenance
The loading phase (4–6 weeks, 2x/week) builds tissue saturation rapidly. Think of it like filling a reservoir — you need to bring peptide levels up to a threshold where the repair cascades are actively triggered. The maintenance phase (4–8 weeks, 1x/week or less) keeps levels above that threshold without the cost and frequency of loading. Once tissue repair is well underway, less frequent dosing is sufficient to sustain the effect.
| Protocol | Loading Phase | Maintenance Phase | Total Cycle | Off Period |
|---|---|---|---|---|
| Short Cycle (Acute Injury) | 4 weeks, 2x/week | 4 weeks, 1x/week | 8 weeks | 4–6 weeks off |
| Standard Cycle | 4–6 weeks, 2x/week | 6–8 weeks, 1x/week | 10–14 weeks | 4–8 weeks off |
| Extended Cycle (Chronic Injury) | 6 weeks, 2x/week | 8 weeks, 1x/week | 14 weeks | 6–8 weeks off |
Cycling Protocols
- Repeat cycles: After the off period, reassess the injury. If further healing is needed, run another loading + maintenance cycle
- Stagger with BPC-157: Some users start TB-500 and BPC-157 together during loading, then continue BPC-157 alone during the TB-500 off period for sustained local support
- Seasonal cycling: Athletes sometimes run a TB-500 cycle at the start of a training season or before a competition prep block to address accumulated wear and minor injuries
- Avoid indefinite use: Continuous dosing beyond 14–16 weeks without a break is not recommended. Take at least 4 weeks off between cycles
TB-500 Stacking Protocols
TB-500 is most commonly stacked with other recovery peptides that target complementary healing pathways. Stacking aims to accelerate recovery by addressing tissue repair from multiple angles simultaneously.
TB-500 + BPC-157 — “Wolverine Stack”
The most popular peptide stack for injury recovery. TB-500 provides systemic tissue repair via actin upregulation and anti-inflammatory action, while BPC-157 promotes localized healing through angiogenesis, nitric oxide modulation, and growth factor upregulation. Their mechanisms are complementary, not overlapping, making this a synergistic combination.
TB-500 + GH Secretagogues (Recovery + Growth Hormone Support)
Growth hormone plays a role in tissue repair, collagen synthesis, and recovery. Combining TB-500 with a GH secretagogue (such as CJC-1295/Ipamorelin or MK-677) can provide complementary support: TB-500 directly promotes cell migration and tissue repair, while elevated GH levels enhance overall recovery capacity and collagen turnover.
| Compound | Dose | Frequency | Purpose |
|---|---|---|---|
| TB-500 | 2–2.5 mg | 2x/week (loading), 1x/week (maintenance) | Direct tissue repair, anti-inflammatory |
| CJC-1295 / Ipamorelin | 100–300 mcg each | Daily (typically before bed) | GH secretion, enhanced recovery, collagen synthesis |
This stack is more advanced and involves additional compounds. It is primarily used by experienced peptide users looking to maximize recovery from significant injuries or surgical procedures.
Explore more combinations with our Peptide Stack Builder or browse the Top 10 Peptide Stacks guide.
Safety, Side Effects & Contraindications
Reported Side Effects
Common (generally mild and transient):
- Temporary lethargy or fatigue — often reported in the first 1–2 weeks of the loading phase, usually resolves on its own
- Mild headache — more common during the loading phase at higher doses
- Injection site reactions — minor redness, swelling, or itching at the injection site; rotate sites to minimize
Uncommon:
- Temporary head rush or lightheadedness shortly after injection
- Nausea — rare; more commonly associated with higher doses
- Flu-like symptoms — occasional reports during the first few days of use
Contraindications
- Active cancer — Thymosin Beta-4 promotes cell proliferation and angiogenesis. While there is no evidence that TB-500 causes cancer, it could theoretically accelerate the growth of existing tumors. Do not use if you have active or recent cancer
- Pregnancy and breastfeeding — no safety data available; do not use
- Children and adolescents — not studied in minors; not recommended
- Active infection at injection site — do not inject into infected, inflamed, or broken skin
- Immunocompromised individuals — TB-500's immune modulatory effects are not well characterized in immunocompromised populations; consult a physician
Important Considerations
- Not FDA-approved — TB-500 is sold as a research chemical, not a pharmaceutical
- Source quality matters — only purchase from vendors that provide third-party certificates of analysis (COA) with purity testing. Low-quality peptides may contain contaminants, underfilled vials, or degraded product
- WADA banned — TB-500 is prohibited by the World Anti-Doping Agency. Tested athletes should not use this peptide
- Discuss with your doctor — especially if you have a history of cancer, autoimmune conditions, or are taking immunosuppressive medications
Common TB-500 Dosing Mistakes
Even experienced users make dosing and handling errors. Here are the most common mistakes and why they matter:
Frequently Asked Questions
Key Takeaways
- TB-500 is a synthetic fragment of Thymosin Beta-4 — it promotes tissue repair by upregulating actin, enhancing cell migration, and reducing inflammation
- Standard loading dose: 2–2.5 mg twice per week for 4–6 weeks, followed by 2 mg once per week maintenance for 4–8 weeks
- Systemic peptide — inject subcutaneously anywhere (abdomen or thigh), no need to inject near the injury site
- Best for soft tissue injuries — tendons, ligaments, muscles, and post-surgical recovery
- Top stack: TB-500 + BPC-157 (“Wolverine Stack”) for complementary systemic + local tissue repair
- Two-phase protocol is essential — do not skip the loading phase; it builds the tissue saturation needed for TB-500 to work effectively
- Cycle on and off — run 8–14 week cycles with 4–8 week breaks between cycles
- Reconstitute with bacteriostatic water — refrigerate after reconstitution, use within 3–4 weeks
- Results take time — initial improvement in 2–3 weeks, significant results in 4–8 weeks for most injuries
- Contraindicated in active cancer — TB-500 promotes cell proliferation and angiogenesis, which could theoretically support tumor growth
This article is for educational and informational purposes only. See our Disclaimer.
References
- Goldstein AL, et al. “Thymosin β4: a multi-functional regenerative peptide. Basic properties and clinical applications.” Expert Opin Biol Ther. 2012;12(1):37-51. PubMed
- Malinda KM, et al. “Thymosin β4 accelerates wound healing.” J Invest Dermatol. 1999;113(3):364-368. PubMed
- Bock-Marquette I, et al. “Thymosin β4 activates integrin-linked kinase and promotes cardiac cell migration, survival and cardiac repair.” Nature. 2004;432(7016):466-472. PubMed
- Philp D, et al. “Thymosin β4 promotes angiogenesis, wound healing, and hair follicle development.” Ann N Y Acad Sci. 2007;1112:95-103. PubMed
- Smart N, et al. “Thymosin β4 and angiogenesis: modes of action and therapeutic potential.” Angiogenesis. 2007;10(4):229-241. PubMed
- Sosne G, et al. “Thymosin beta 4: a potential novel therapy for neurotrophic keratopathy, dry eye, and ocular surface diseases.” Vitam Horm. 2016;102:267-306. PubMed
Next Steps
Continue your research with these resources.
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