Description
.stl-pdp{
–c-logo:#062021;
–c-deep:#081c17;
–c-forest:#0a3721;
–c-green:#0ea43c;
–c-lime:#91c72e;
–c-grey:#e0e0e0;
–c-white:#ffffff;
–c-ink:#0d2a22;
–c-mut:#52635c;
–c-line:#e3e9e6;
–c-line-d:rgba(255,255,255,.14);
–c-mut-d:#aebfb7;
max-width:1000px;margin:0 auto;color:var(–c-ink);
font-family:”Helvetica Neue”,Arial,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
line-height:1.6;-webkit-font-smoothing:antialiased;
}
.stl-pdp *{box-sizing:border-box}
.stl-pdp h2,.stl-pdp h3{letter-spacing:-.02em;line-height:1.15;color:var(–c-logo)}
.stl-pdp h2{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:800;margin:0 0 .5rem}
.stl-pdp h3{font-size:1.18rem;font-weight:800;margin:0 0 .35rem}
.stl-pdp p{margin:0 0 1rem}
.stl-pdp .eyebrow{display:inline-block;font-size:.74rem;font-weight:800;letter-spacing:.14em;
text-transform:uppercase;color:var(–c-green);margin-bottom:.7rem}
.stl-pdp .eyebrow–lime{color:var(–c-lime)}
.stl-pdp a{color:var(–c-green);text-decoration:underline;text-underline-offset:2px;font-weight:600}
.stl-pdp section{padding:46px 4px}
.stl-pdp section + section{border-top:1px solid var(–c-line)}
.stl-pdp .stl-btn{display:inline-block;background:var(–c-green);color:#fff;text-decoration:none;font-weight:800;
font-size:.95rem;padding:13px 24px;border-radius:11px;transition:transform .15s,background .18s;border:0;cursor:pointer}
.stl-pdp .stl-btn:hover{background:#0bbf45;color:#fff;transform:translateY(-1px)}
.stl-grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stl-chip{background:var(–c-white);border:1px solid var(–c-line);border-radius:14px;padding:20px 18px}
.stl-chip svg{width:26px;height:26px;color:var(–c-green);margin-bottom:10px}
.stl-chip b{display:block;color:var(–c-logo);font-size:.98rem;margin-bottom:3px}
.stl-chip span{font-size:.86rem;color:var(–c-mut)}
.stl-spec{background:#fff;border:1px solid var(–c-line);border-radius:18px;overflow:hidden;color:var(–c-ink);
box-shadow:0 1px 2px rgba(6,32,33,.04),0 14px 40px rgba(10,55,33,.08)}
.stl-spec__tabs{display:flex;gap:4px;background:#f1f6f3;padding:7px;flex-wrap:wrap;border-bottom:1px solid var(–c-line)}
.stl-spec__tab{appearance:none;border:0;background:transparent;cursor:pointer;font:inherit;font-weight:700;
font-size:.92rem;color:var(–c-mut);padding:11px 18px;border-radius:10px;transition:background .18s,color .18s;
flex:1 1 auto;min-width:120px;text-align:center}
.stl-spec__tab:hover{color:var(–c-logo)}
.stl-spec__tab[aria-selected=”true”]{background:var(–c-forest);color:#fff;box-shadow:0 3px 12px rgba(10,55,33,.28)}
.stl-spec__tab:focus-visible{outline:3px solid var(–c-green);outline-offset:2px}
.stl-spec__panel{padding:28px clamp(20px,3vw,34px) 34px}
.stl-spec__panel[hidden]{display:none}
.stl-spec__table{width:100%;border-collapse:collapse;font-size:.95rem}
.stl-spec__table caption{text-align:left;font-weight:800;color:var(–c-logo);font-size:1.06rem;padding-bottom:16px}
.stl-spec__table th,.stl-spec__table td{text-align:left;padding:13px 4px;border-bottom:1px solid var(–c-line);vertical-align:top}
.stl-spec__table tr:last-child th,.stl-spec__table tr:last-child td{border-bottom:0}
.stl-spec__table th{width:38%;font-weight:700;color:var(–c-ink)}
.stl-spec__table td{color:var(–c-mut)}
.stl-spec__table tbody tr:hover{background:#f6faf8}
.stl-spec__table sub{font-size:.72em}
.stl-seq{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;word-break:break-word;line-height:1.5}
.stl-copy{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}
.stl-copy__btn{appearance:none;border:1px solid var(–c-line);background:#fff;border-radius:7px;
cursor:pointer;font:inherit;font-size:.74rem;font-weight:700;color:var(–c-green);padding:3px 9px;transition:background .15s,border-color .15s}
.stl-copy__btn:hover{background:#f1f6f3;border-color:var(–c-green)}
.stl-copy__btn:focus-visible{outline:2px solid var(–c-green);outline-offset:1px}
.stl-copy__btn[data-copied=”1″]{color:#fff;background:var(–c-green);border-color:var(–c-green)}
.stl-trust{display:grid;gap:13px}
.stl-trust__row{display:flex;gap:13px;align-items:flex-start;padding:15px 17px;background:#f4f8f5;border-radius:12px}
.stl-trust__ic{flex:0 0 auto;width:22px;height:22px;color:var(–c-green);margin-top:1px}
.stl-trust__row b{color:var(–c-logo)}
.stl-trust__row p{margin:4px 0 0;font-size:.9rem;color:var(–c-mut)}
.stl-pill{display:inline-block;background:var(–c-lime);color:#062021;font-size:.76rem;font-weight:800;padding:3px 11px;border-radius:999px;margin-left:8px;vertical-align:middle}
.stl-spec h3{color:var(–c-logo)}
.stl-spec .stl-sub{color:var(–c-mut);font-size:.92rem;margin:0 0 18px}
.stl-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.stl-list li{display:flex;gap:12px;align-items:flex-start;font-size:.94rem;color:var(–c-ink)}
.stl-list li b{color:var(–c-logo)}
.stl-list svg{flex:0 0 auto;width:18px;height:18px;color:var(–c-green);margin-top:3px}
.stl-spec a.stl-btn{margin-top:20px}
.stl-coa{margin:6px 0 24px}
.stl-coa img{display:block;width:100%;height:auto;border:1px solid var(–c-line);border-radius:12px;background:#fff}
.stl-coa figcaption{font-size:.84rem;color:var(–c-mut);margin-top:8px}
.stl-coa-head{display:flex;align-items:center;flex-wrap:wrap;margin:26px 0 10px}
.stl-coa-head h3{margin:0}
.stl-feat{display:grid;grid-template-columns:1fr 1fr;gap:14px 30px;margin-top:8px}
.stl-feat div{display:flex;gap:11px;align-items:flex-start}
.stl-feat svg{flex:0 0 auto;width:19px;height:19px;color:var(–c-green);margin-top:3px}
.stl-feat b{color:var(–c-logo)}
.stl-feat p{margin:2px 0 0;font-size:.9rem;color:var(–c-mut)}
.stl-reg{background:var(–c-deep);color:#fff;border-radius:18px;padding:clamp(26px,4vw,40px)}
.stl-reg h2{color:#fff}
.stl-reg .eyebrow{color:var(–c-lime)}
.stl-reg__grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.stl-reg__card{background:rgba(255,255,255,.05);border:1px solid var(–c-line-d);border-radius:12px;padding:18px 20px}
.stl-reg__card b{color:var(–c-lime);display:block;margin-bottom:5px;font-size:.95rem}
.stl-reg__card p{margin:0;font-size:.9rem;color:var(–c-grey)}
.stl-refs{font-size:.84rem;color:var(–c-mut);counter-reset:r;list-style:none;padding:0;margin:0;display:grid;gap:9px}
.stl-refs li{padding-left:30px;position:relative}
.stl-refs li::before{counter-increment:r;content:counter(r);position:absolute;left:0;top:0;
width:21px;height:21px;background:var(–c-forest);color:var(–c-lime);border-radius:6px;
font-size:.72rem;font-weight:800;display:flex;align-items:center;justify-content:center}
.stl-note{margin-top:8px;padding:16px 18px;border-left:4px solid var(–c-green);background:#f2f7f4;
border-radius:0 10px 10px 0;font-size:.85rem;color:var(–c-mut)}
.stl-note b{color:var(–c-logo)}
.stl-pdp–nojs .stl-spec__tabs{display:none}
.stl-pdp–nojs .stl-spec__panel[hidden]{display:block}
.stl-pdp–nojs .stl-spec__panel + .stl-spec__panel{border-top:1px solid var(–c-line)}
@media (max-width:760px){
.stl-grid4{grid-template-columns:1fr 1fr}
.stl-feat,.stl-reg__grid{grid-template-columns:1fr}
.stl-spec__table th{width:46%}
}
@media (max-width:440px){.stl-grid4{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){.stl-pdp *{transition:none!important}}
.stl-pdp{font-size:16px}
.stl-pdp p,.stl-pdp li,.stl-pdp td,.stl-pdp th,.stl-pdp .stl-spec__table{font-size:16px;line-height:1.65}
.stl-pdp .stl-chip span,.stl-pdp .stl-sub,.stl-pdp .stl-feat p,.stl-pdp .stl-reg__card p,.stl-pdp .stl-trust__row p,.stl-pdp .stl-refs li,.stl-pdp .stl-note,.stl-pdp .stl-copy__btn,.stl-pdp .stl-btn,.stl-pdp .stl-spec__tab{font-size:16px}
.stl-pdp h3{font-size:1.4rem}
.stl-pdp h2{font-size:clamp(2rem,3vw,2.5rem)}
.stl-pdp .eyebrow,.stl-pdp .eyebrow–lime{font-size:14px}
.stl-pdp .stl-pill{font-size:14px}
.stl-pdp .stl-coa figcaption{font-size:14px}
.stl-pdp .stl-refs li::before{font-size:14px}
.stl-pdp .stl-spec__table sub{font-size:14px}
.stl-pdp .stl-spec__table caption{font-size:18px}
.stl-pdp .stl-seq{font-size:13px}
Key highlights
5 mg lyophilized vialFreeze-dried peptide in a sterile, UV-resistant glass vial.
≥99% purityEach lot analyzed by an accredited US third-party lab via HPLC and mass spectrometry.
Cold-chain peptideRefrigerate after reconstitution. Diluent and lab supplies not included.
Research use onlySupplied exclusively for laboratory investigation and development.
Product specifications
| Compound Class | Synthetic Polypeptide · Analog of thymosin beta-4 (Tβ4) |
|---|---|
| Form | Lyophilized powder in sterile glass vial |
| Quantity | 5 mg per vial |
| CAS Number | 77591-33-4 |
| Chemical Formula | C212H350N56O78S |
| Molecular Weight | 4963.49 g/mol |
| Residues | 43-amino-acid peptide |
| Amino Acid Sequence | Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Gln-Glu-Lys-Asn-Pro-Leu-Pro-Ser-Lys-Glu-Thr-Ile-Glu-Gln-Glu-Lys-Gln-Ala-Gly-Glu-Ser-OH |
| Synonyms | TB-500, Thymosin Beta-4, Tβ4, Thymosin β4 |
| Verified Purity | Batch-tested to 99.42% (HPLC) |
For laboratory research use only. Not for human or animal consumption.
Independently verified
This peptide is analyzed by an accredited US third-party laboratory before it ships.
Identity and purity confirmed by MZ Biolabs (Tucson, AZ), a US DEA-licensed analytical facility, via HPLC purity analysis and mass-spectrometry identity confirmation under GLP standards.
Our third-party certificates of analysis are published on our website — no login required.
TB-500 (Thymosin Beta-4)99.42% pure
Storage & handling
Peptides are photo- and temperature-sensitive; handle per standard laboratory practice.
- Lyophilized storage: Keep the sealed vial cool, dry, and protected from light. For longer-term storage, freezing is standard practice for lyophilized peptides.
- After reconstitution: Refrigerate (approximately 2–8 °C) and follow your institution’s SOPs for aliquoting, handling, and disposal. Avoid repeated freeze–thaw cycles.
- Diluent not included: A suitable laboratory diluent and reconstitution supplies are not provided with this product.
- UV-resistant glass vial to help protect photo-labile peptides during storage.
- Tamper-evident seal to support chain-of-custody and inventory controls.
Why source TB-500 from Sports Technology Labs
Quality control across the research-peptide industry is inconsistent, and many suppliers do not publish third-party testing for their products. Independent verification of identity and purity is essential for reproducible research.
Verified by MZ Biolabs (Tucson, AZ), an accredited US laboratory, via HPLC and mass spectrometry, with batch-linked COAs.
Freeze-dried into sterile, UV-resistant glass vials and packaged in the USA.
Supports chain-of-custody, label transparency, and batch-linked traceability.
Transparent business, standard payment methods, no misrepresentation.
What is TB-500?
TB-500 is a synthetic peptide corresponding to the full sequence of thymosin beta-4 (Tβ4), a naturally occurring 43-amino-acid polypeptide found widely across mammalian tissues. Tβ4 belongs to the beta-thymosin family of small, acidic, actin-binding peptides.
Mechanistically, thymosin beta-4 is characterized in the biochemical literature as a major intracellular G-actin–sequestering peptide, meaning it binds monomeric actin and participates in cytoskeletal dynamics. It is studied as a research chemical to investigate Tβ4-related biology in experimental models.
TB-500 is an experimental research chemical, supplied strictly for laboratory research. Sports Technology Labs makes no claims regarding its effects, and nothing in this listing should be interpreted as describing outcomes in humans or animals.
Important regulatory information
TB-500 is an investigational research peptide. It is not approved by the FDA and is not a drug, food, dietary supplement, cosmetic, or peptide-therapy product. Marketing it for human use is unlawful.
Thymosin beta-4 and related substances are prohibited by the World Anti-Doping Agency at all times under S2 (Peptide Hormones, Growth Factors, Related Substances and Mimetics) (ref. 3).
In the United States, TB-500 is not a controlled substance and may be legally purchased and possessed for laboratory research use.
Sports Technology Labs are chemical suppliers, not medical providers. We do not condone or encourage consumer use of research compounds.
Scientific references
- Huff T, Müller CSG, Otto AM, Netzker R, Hannappel E. β-Thymosins, small acidic peptides with multiple functions. Int J Biochem Cell Biol. 2001;33(3):205–220.
- National Center for Biotechnology Information. PubChem Compound Summary for Thymosin β4 / TB-500 (CAS 77591-33-4): sequence, molecular formula, and molecular weight. PubChem, National Library of Medicine.
- WADA Prohibited List (2025), Section S2: Peptide Hormones, Growth Factors, Related Substances and Mimetics. WADA.org.
Research use only. All products on this website are intended exclusively for laboratory research and development. They are not for human or animal consumption. These statements have not been evaluated by the U.S. Food and Drug Administration, and these products are not intended to diagnose, treat, cure, or prevent any disease.
