Compare Peptides Side by Side
Put any two or three of the 79 library entries next to each other on compound class, molecular weight, half-life, origin, mechanism and studied research areas — the attributes that actually distinguish one compound from another.
| Attribute | BPC-157 | TB-500 |
|---|---|---|
| Compound class | Synthetic pentadecapeptide | Actin-binding peptide fragment |
| Research category | Healing & Recovery | Healing & Recovery |
| Length (amino acids) | 15 | 7 |
| Molecular weight | 1419.5 Da | ~4921 Da (full-length thymosin beta-4); ~889 Da for the Ac-LKKTETQ fragment form |
| Half-life | <30 minutes (elimination, reported in rats/dogs) | ~2-3 hours (elimination); tissue effects reported to persist for days |
| Origin | BPC-157 is a synthetic peptide whose sequence corresponds to a partial fragment of human body protection compound (BPC), a protein reported to be present in gastric juice. It does not occur naturally as an isolated peptide and is produced synthetically for research. | TB-500 is a synthetic peptide commonly described as corresponding to the actin-binding domain (a short fragment, often the LKKTETQ region) of Thymosin Beta-4, a naturally occurring 43-amino-acid protein involved in actin regulation. TB-500 is produced synthetically and is not identical to full-length Thymosin Beta-4. |
| Mechanism | In animal and in-vitro studies, BPC-157 has been associated with promotion of angiogenesis and modulation of growth-factor signaling pathways, including effects reported on the VEGFR2 pathway and nitric oxide systems. Researchers have also described interactions with the FAK-paxillin pathway and effects on fibroblast and tendon-cell migration. These mechanisms are characterized primarily in rodent models and cell culture and have not been established in controlled human trials. | Thymosin Beta-4 and its actin-binding fragment are studied for their ability to sequester G-actin and influence actin polymerization, which relates to cell migration. In preclinical models, this activity has been linked to cell migration, angiogenesis and tissue-repair processes. These mechanisms are drawn largely from animal and cell-culture research and are not established in controlled human trials for TB-500 itself. |
| Research areas | Tendon, ligament and muscle healing (animal models) Gastrointestinal mucosal protection and ulcer healing (rodent studies) Angiogenesis and wound healing (preclinical) Nerve and bone injury repair (animal models) Modulation of NSAID-related gastrointestinal injury (rodent studies) | Cell migration and actin cytoskeleton dynamics (in-vitro) Wound healing and tissue repair (animal models) Angiogenesis (preclinical) Cardiac and corneal repair (Thymosin Beta-4 research) Inflammation modulation (preclinical) |
| What sets it apart | Unlike copper-binding cosmetic tripeptides or the actin-modulating TB-500, BPC-157 is a longer synthetic peptide studied primarily for connective-tissue and gastrointestinal repair endpoints in animals. | TB-500 is defined by its actin-binding fragment identity, distinguishing it from BPC-157's growth-factor/angiogenesis focus and from copper tripeptides used cosmetically. |
Reading a peptide comparison
Compound class is the most useful first filter — a GHRH analog and a ghrelin-receptor agonist both sit in growth-axis research, but they act on different receptors and are studied for different reasons. Two compounds in the same category are not interchangeable.
Half-life determines how a compound behaves over time in a study design, and it varies enormously: some research peptides clear in minutes, others persist for days. It is the single largest driver of protocol differences between otherwise similar compounds.
Molecular weight and length indicate whether a compound is a short synthetic fragment or a larger protein-like molecule, which in turn affects stability, storage, and how it is handled in the lab.
Origin distinguishes naturally occurring sequences from synthetic analogs designed to modify half-life, receptor selectivity, or stability relative to the parent molecule.
Deeper comparisons
For narrative comparisons with the underlying research context rather than a specification table, the Research Library has dedicated pages:
- BPC-157 vs TB-500 — the two most commonly stacked tissue-repair peptides.
- Sermorelin vs CJC-1295 — two GHRH analogs with very different half-lives.
- Selank vs Semax — two short synthetic peptides in nootropic research.
- GLP-1 family comparison — mono-, dual- and triple-agonist compounds.