What did @drdrewtimmermans actually say?
The creator walked through reconstitution math for a combined BPC-157 and TB-500 vial, landing on 500 micrograms of each peptide per injection using a 0.25 mL draw from a 2 mg/mL solution. He also flagged a real concern: blended vials lock you into fixed ratios that may not suit how each peptide is typically dosed individually.
Specifically, he argued that "the appropriate dose of TB-500 is generally a little bit higher dose than the BPC-157," which drives his math. He recommended starting BPC-157 at "250, maybe 300 micrograms" for subcutaneous use but acknowledged the blend forces a higher BPC-157 dose to hit an effective TB-500 threshold. He assumed the vial contains 10 mg of each peptide, not a 5/5 split, and built his calculations on that assumption.
Does the science back this up?
Partially, but the evidence base here is thin enough that "the science" is doing a lot of heavy lifting. Most of what exists comes from animal studies, and human clinical data on dosing for either peptide is effectively nonexistent in peer-reviewed literature.
BPC-157 (body protection compound) has been studied primarily in rodent models. Sikiric et al. (2018, Current Pharmaceutical Design) documented wound healing and anti-inflammatory effects in rats at doses that do not translate directly to human equivalents. TB-500, a synthetic fragment of thymosin beta-4, has some human safety data from wound care trials, but those used topical or systemic administration in clinical settings, not subcutaneous self-injection at the doses discussed here (Goldstein et al., 2012, Annals of the New York Academy of Sciences). There is no peer-reviewed consensus on what "an effective dose" of either compound looks like in healthy humans seeking recovery or optimization. The dosing figures circulating in telehealth and online communities are largely derived from practitioner experience, not controlled trials.
What did they get wrong (or right)?
The reconstitution math itself is correct. Five mL of bacteriostatic water added to a 10 mg vial yields a 2 mg/mL (2000 mcg/mL) solution. Drawing 0.25 mL from that delivers 500 mcg. That arithmetic checks out cleanly.
His concern about blended peptides is legitimate and worth taking seriously. If BPC-157 is typically dosed lower than TB-500, a fixed-ratio blend creates a real clinical tension: you either underdose TB-500 or overdose BPC-157. That is a genuine formulation problem, not just a preference.
What he got wrong, or at least glossed over, is the framing of 500 mcg as an "appropriate" TB-500 dose. There is no clinical trial establishing that figure in humans for the use cases being implied here. He also does not address purity, peptide degradation, or the sourcing problem: compounded peptides vary significantly in quality (Xu et al., 2020, Journal of Pharmaceutical and Biomedical Analysis found notable impurity profiles in commercially sourced research peptides). Presenting dosing math with this level of confidence implies a precision the underlying evidence does not support.
What should you actually know?
The math in this video is arithmetically sound, but math is the easy part. The harder questions are whether these doses are safe, effective, or appropriate for any given person, and those questions do not have clean answers yet.
Both BPC-157 and TB-500 remain unapproved by the FDA for any therapeutic indication. BPC-157 has no completed human clinical trials as of 2024. TB-500 has slightly more human data, but it comes from wound care contexts, not subcutaneous self-administration for athletic recovery. The compounded peptide market operates in a regulatory gray zone, and quality control is inconsistent. A 2021 analysis by Swartz et al. (JAMA Internal Medicine) found that compounded medications frequently deviate from labeled concentrations, a problem that makes precise dosing math somewhat academic if the starting material is not reliably pure. Anyone considering these compounds should be working with a licensed provider who can monitor for adverse effects, not following dosing math from a short-form video, however well-intentioned.