Research Comparison
BPC-157 vs TB-500
A side-by-side research comparison of BPC-157 and TB-500 drawn from DRPSHP' peptide database records.
BPC-157
BPC-157 is a synthetic chain of fifteen amino acids taken from a longer protein that was reported in human gastric juice and called body protection compound. That parent protein is described chiefly by the group who proposed it, and the peptide itself is known almost solely through the same group's output. The experiments are overwhelmingly in rodents and cover injury models of tendon, ligament, muscle and bone, damage to the stomach and intestine, and a number of nervous-system models. Human evidence amounts to a few small reports, not controlled trials, and replication by laboratories independent of the originators is limited.
TB-500
Residues 17 to 23 of thymosin beta-4, a 43-residue protein that binds actin, are reproduced by TB-500 as the seven-residue chain Ac-LKKTETQ. The copied stretch lies in the middle of the parent's actin-binding region. Since that position is internal in the real protein, the acetyl cap at the front end is an addition made in synthesis. Care is needed with the name, because it is sometimes attached to full-length thymosin beta-4 even though the two differ in size (roughly 0.9 kDa against 5 kDa) and in the portions of the protein they contain. The bulk of the literature is on the whole protein, in cell culture and rodent models of skin, heart and corneal injury, whereas studies of the fragment by itself are far fewer and cannot be taken to show the same behaviour.
Reading a comparison
A comparison places two records side by side; it does not merge them. Each description above is drawn from that compound's own record, and the two were not necessarily characterised by the same methods, at the same time, or to the same level of detail. Before comparing any attribute, it is worth establishing that both records describe the substance you think they describe — names are not identifiers, and two entries sharing a name can differ in salt form, stereochemistry or the convention used to state a mass. Where a figure carries no method beside it, the comparison is between two reported numbers rather than between two measurements.