Compound comparison

BPC-157 vs TB-500

These two are frequently mentioned together, which creates the impression they are variants of the same thing. They are not related at all — different origins, different structures, different described mechanisms.

BPC-157 is a synthetic fragment of a protein found in gastric juice. TB-500 reproduces the actin-binding region of thymosin beta-4, an abundant intracellular protein. They appear together because researchers studying tissue repair often look at both, not because they are chemically similar.

Side by side

	BPC-157	TB-500
Origin	Fragment of a human gastric juice protein	Fragment of thymosin beta-4, an actin-binding protein
Length	15 amino acids	7 amino acids (active region)
Primary described mechanism	Angiogenic signalling, nitric oxide pathway	G-actin sequestration, cell migration
Commonly cited marker	VEGFR2 upregulation	Actin cytoskeleton regulation
Notable stability property	Stable in acidic/gastric conditions	Small fragment, more stable than parent protein
Research literature	Predominantly rodent models	Cell culture and animal models
Available as a blend	Yes	Yes

Choosing between them

Researchers work with BPC-157 when

vascular signalling or gastrointestinal models are the focus. Its stability under acidic conditions is unusual for a peptide of its size and is part of why it became a frequent subject in gut research.

Researchers work with TB-500 when

cell migration is the endpoint being measured. Actin regulation governs how cells change shape and move, so migration assays — endothelial cells, keratinocytes, fibroblasts — are the natural application.

BPC-157 50mg Kit

5mg • 10 Vials

$125.00

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TB-500 100mg Kit

10mg • 10 Vials

$300.00

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Common questions

Are BPC-157 and TB-500 the same kind of compound?

No. They are unrelated peptides with different origins and different described mechanisms. They are studied in overlapping contexts, which is why they are so often discussed together.

Why are they sold as a blend?

Because researchers examining tissue repair frequently want both, and the described mechanisms are distinct rather than overlapping. A combined vial requires one reconstitution instead of two and generally costs less than buying both separately.

What is thymosin beta-4?

A naturally occurring 43-amino-acid protein and one of the most abundant actin-binding proteins in mammalian cells. TB-500 is a synthetic fragment reproducing its active region — shorter, more stable and cheaper to synthesise.

This comparison covers structure, receptor targets and development stage — matters of published record. It does not rank the compounds or claim either produces better outcomes. Much of the supporting literature is preclinical. All products are supplied for laboratory research use only.

See the studies behind both compounds →