READOUT / 08 — ABOUT THE DIGEST
About TB-500 Legit: the literature, drawn to spec.
An independent editorial project that reads the published TB-500 record as a specification — and is explicit about what it is not.
What this site is
TB-500 Legit is an independent editorial project that publishes summaries of the peer-reviewed research literature on TB-500 and its parent protein, thymosin beta-4. We are not a clinic. We do not employ clinicians and we do not provide medical advice. We do not manufacture, sell, or distribute any product. Our work is editorial commentary on publicly available science.
The site is organized as a drafting spec sheet because TB-500's honest story is a specification problem. "TB-500" in commerce and anti-doping science means the Ac-LKKTETQ heptapeptide of about 889 Da; most published efficacy data describe the full-length thymosin beta-4 protein of about 4963 Da. We keep those two apart on every page, dimension each figure to its study, and read the regulatory standing straight.
What 'legit' means here — and what it does not
The word "legit" in this domain is editorial framing, not a claim about services. It names a position this publisher occupies relative to the literature: a due-diligence reading that asks the verification questions a careful research consumer would — is it FDA-approved, what is the 503A category, is it prohibited in sport, and how is the identity and purity of research-grade material established. It is not a representation that the site evaluates, recommends, supplies, or vouches for any seller of TB-500.
We do not name or rank vendors, and we do not provide sourcing links, prices, or coupons. A "legit" reading of TB-500, as we use the term, is a reading that draws the honest line between what was measured on the parent protein and what is actually established for the fragment.
Nothing here is dosing guidance. Where we cite a dose, it is a study parameter — what was administered, to which species, by which route — never a recommendation for any person.
How we cite
Every quantitative claim on the site maps to a numbered entry on the references and citations page, with a DOI, PMID, or NCT identifier. Regulatory facts come only from the audited FDA reference and are stated present-tense; we do not assert any future FDA action as decided or dated. Where a finding used full-length thymosin beta-4 rather than the seven-mer, we flag it, because that distinction is the whole point of an honest TB-500 digest.