thymosin α-1 vs tb-500

thymosin α-1 (B-tier) vs tb-500 (A-tier). mechanism, trials, claims vs data, dosing literature. side-by-side reference.

thymosin α-1 — tier B

thymic immune peptide. approved abroad for hepatitis B. used stateside for generic 'immune support.'

thymic immune peptide. approved abroad for chronic hepatitis B adjunct. used stateside for off-label 'immune support' on much thinner data.

global Zadaxin · 35 markets · half-life approximately 2 hours in plasma (subcutaneous); dosing regimens typically twice weekly in approved indications · healing

tb-500 — tier A

names a 7-amino-acid fragment of thymosin beta-4, but the vial you buy is a coin toss: fragment, full-length protein, or mislabeled. the COA mass is the only thing that knows.

the name means a 7-amino-acid fragment of thymosin beta-4, but vendor vials routinely contain the full 43-amino-acid protein instead, and the label does not tell you which. the molecule is real and the human proof is not.

banned USEF 2014 · half-life ~0.5 to 2 hours (human phase-1 PK, PMID 34346165; dose-dependent), same as full thymosin beta-4 when that is what the vial holds; the bare heptapeptide clears faster · healing

at a glance

• thymosin α-1: tier B · global Zadaxin · 35 markets
• tb-500: tier A · banned USEF 2014

reptides grades the research record and cites the literature behind every call. research reference only; not medical advice.