bpc 157 vs tb 500, what actually is the difference in the research?

tendon_readingSenior Analyst

probably the most common pairing in the whole space. writing down what i think i know so people can correct me.

bpc-157: 15 amino acid fragment from a gastric protein. rat studies on tendon to bone healing, gut lining, some blood vessel / angiogenesis stuff. angiogenesis is supposedly the common thread.

tb-500: synthetic fragment of thymosin beta-4. tb4 itself is a real well studied protein involved in cell migration. tb-500 is a piece of it, and imo the thing people get wrong constantly is citing tb4 findings as if they were tb-500 findings.

rough difference as i understand it: bpc gets pitched at local repair and gut, tb-500 at cell migration and going everywhere in the body.

both are animal work and cell work. no human trials i'd cite for either.

what am i getting wrong?

18 replies19 upvotesPeptide Comparisons

Peptides discussed

18 replies

  • preclinical_onlySenior Analyst

    The TB4 / TB-500 line is the most important thing in your post. Thymosin beta-4 is a real protein with a real literature, some of it human. TB-500 is a fragment sold under a different name. When someone cites "the TB-500 human data" it is almost always TB4 data wearing a hat.

    15 upvotes

  • ShowMeTheDataSenior Analyst

    ^ most common sourcing error in the entire space

    7 upvotes

  • rotatorcuff_litAnalyst

    been down this hole for shoulder stuff. the number of articles that cite a tb4 paper and then say tb-500 for the rest of the page is wild

    6 upvotes

    • preclinical_onlySenior Analyst

      And the TB4 paper is usually preclinical too. Two layers of drift.

      4 upvotes

  • deload_weekAnalyst

    tb4 wearing a hat is going to live in my head now

    5 upvotes

  • GHaxisSenior Analyst

    They also get run together more than compared. If most reports involve both you can't attribute anything to either one.

    5 upvotes

  • same_tbhSenior Analyst

    good point

    2 upvotes

  • n_of_whatSenior Analyst

    Worth saying the sample sizes out loud. Most of the BPC rodent papers are 6-12 animals per arm. Normal for the field, but "consistent" means consistent across small studies from not many groups.

    6 upvotes

    • unconvinced_stillSenior Analyst

      That's exactly what keeps me skeptical. Independent replication would move me. Hasn't happened.

      5 upvotes

    • tendon_readingSenior Analyst

      no good answer to that one tbh

      2 upvotes

    • quick_qSenior Analyst

      so which one is the tendon one?

      1 upvote

  • newvialwhodisSenior Analyst

    is tb4 sold anywhere or only tb500?

    1 upvote

  • sore_knees_litAnalyst

    more useful than most articles ive read on this. the tb4 thing i did not know

    3 upvotes

  • SteelmanItSenior Analyst

    Best case for taking BPC seriously: mechanism isn't implausible, animal results point the same way, and nobody is going to fund a phase 3 for something unpatentable.

    Best case against: consistency in small studies from a few groups is weak, the TB4 substitution makes the evidence look bigger than it is, and "no money" is unfalsifiable.

    Second list is heavier right now imo. Neither side is dumb.

    8 upvotes

    • unconvinced_stillSenior Analyst

      I probably underweight the funding point. Still lands on the second list.

      3 upvotes

    • tendon_readingSenior Analyst

      yeah thats a fairer version than my post

      2 upvotes

  • MetabolicLurkerSenior Analyst

    following

    1 upvote

  • quiet_quantSenior Analyst

    3 independent labs before I'd call it established. Not a high bar. Not cleared.

    4 upvotes

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