Pentadeca Arginate vs TB-500
A rebranded BPC-157 salt with almost no literature of its own, against a peptide whose single randomized human result is about an eye drop.
Pentadeca Arginate
PDA
Marketed as a more stable upgrade on BPC-157, but it has almost no research of its own — the evidence base is borrowed and preclinical.
Full Pentadeca Arginate evidence reviewTB-500
Thymosin β4
Mechanistic and early-stage human work (e.g. ophthalmology); no performance or recovery outcome trials.
Full TB-500 evidence reviewSide by side
| Pentadeca Arginate | TB-500 | |
|---|---|---|
| Marketed for | Healing, recovery (a 'stable BPC-157') | Recovery, tissue repair |
| Evidence grade | Preclinical / minimal | Preclinical / minimal |
| Family | Repair / structural | Repair / structural |
| Regulatory status | Not FDA-approved | Not FDA-approved |
| How it's obtained | Research-only | Research-only |
| Key human source | Sikiric, Inflammopharmacology 2024 | Expert Opin Biol Ther, 2018 |
marks a row where the two differ. Evidence grades come from our evidence matrix, which grades each molecule on the human data for the use it is marketed for.
Our verdict
TB-500 is the better-documented molecule, though not for the reason it is sold. Thymosin beta-4 has Phase 2 randomized data in severe dry eye using an ophthalmic solution, plus preclinical work in stroke, traumatic brain injury and cardiac repair; the injectable TB-500 marketed for muscle and tendon recovery has no published human efficacy trials, no established dosing, and is prohibited in sport by WADA. Pentadeca arginate has essentially no direct research at all and inherits its entire case from BPC-157's rodent studies. Neither is an approved drug, they have never been compared directly, and neither has human recovery outcomes.
Pentadeca Arginate fits if
Hard to justify on evidence; if the BPC-157 mechanism is what interests you, read the parent molecule rather than its arginate rebrand.
TB-500 fits if
Someone curious about actin-sequestering repair biology or the dry-eye program, who keeps that narrow clinical result separate from the recovery marketing.
Where to get it
Where to get peptide therapy
Clinician-led telehealth services that prescribe compounded peptides. The specific peptides offered vary by provider — confirm Pentadeca Arginate availability before ordering.
