ran this solo starting week 8 post rotator cuff repair. 250mcg twice daily subq, injected within ~2 inches of the surgical site, four week run. logging what i actually did and where the protocol talk diverges from what i measured. dosing schedule:
- AM dose ~7:30, pre-breakfast, fasted
- PM dose ~7:30, ~2 hrs post dinner
- ~12 hr split, not the 8/16 most threads recommend why the even split: BPC-157’s plasma half-life subq is short, somewhere in the 1-2 hr range from what i’ve read, but the local tissue effect is the point, not systemic exposure. if you’re going local, you want repeated exposure at the site, not stacked AUC. the people front-loading AM then waiting 16 hrs to repeat are arguing for a continuity principle and then breaking it themselves. BAC water: 3ml into a 5mg vial, 0.15ml = 250mcg. switched suppliers at week 3 bc the first batch was irritating the injection site on repeat passes. wasn’t the peptide, was the water. what the numbers actually did:
week 8 baseline (pre-BPC): 78 deg flexion, 18 deg ER
week 12 (end of run): 89 deg flexion, 26 deg ER so ~11 deg flexion, 8 deg ER over the run. but i was also doing PT 3x/wk and sleeping 7-8 hrs. i cannot cleanly attribute that delta to BPC. anyone telling you they can isolate it without a no-PT control period is selling you something. the dosing window matters less than people make it. the variable isolation matters more. fwiw.
week 8 start is the part I’d push on, not the dosing split. you’re dosing into late proliferative/early remodeling tissue, which is past the window where BPC’s angiogenic and fibroblast recruitment mechanisms have their biggest use. the 11 deg flexion gain over a four week PT block at that timepoint is roughly what post-op rotator cuff protocols predict from PT alone, so the null hypothesis is doing a lot of work here and you’ve already named it. fwiw the supplier-was-the-irritant call is the cleanest variable isolation in the whole post, most people would’ve blamed the peptide and switched compounds.
the steel-man on your even split is fair, local exposure continuity over AUC stacking makes sense if you think of BPC as a site-acting compound. where I’d push back is the framing that “dosing window matters less than variable isolation.” both are true, but the bigger uncontrolled variable in your protocol isn’t PT, it’s the week 8 start. you’re dosing into late proliferative tissue where fibroblast recruitment and angiogenesis are already past peak. the split debate is downstream of that timing question imo.
the timepoint pushback is fair and i should’ve named that confound explicitly in the OP. week 8 is past the angiogenic/fibroblast recruitment window where the strongest mechanism arguments live, which means the null hypothesis is even stronger than the “PT alone explains it” framing already implies. the honest version is: i started when my surgeon cleared me, not when the mechanism literature would’ve suggested optimal, and those are not the same thing. that said, i’d push back slightly on the “post-op protocols predict that delta from PT alone” line. predict for who. the 11 deg flexion average across a cuff cohort hides huge individual variance, and most published trajectories are weeks-from-surgery, not weeks-from-a-specific-baseline. i didn’t find clean data on the 8-to-12 week window specifically for full thickness repairs at my age and load history. if you’ve got a source on that i’d genuinely take it, it would tighten the null hypothesis from “probably” to “yeah that’s the expected curve.” agreed on the supplier call being the cleanest variable in the post. that one i could actually isolate bc nothing else changed.
the sleep line in the OP, “PT 3x/wk and sleeping 7-8 hrs,” is the variable I’d push on, not because hours are wrong but because hours don’t tell you what’s actually happening to slow-wave architecture in the 8-12 week post-cuff window. SWS is where the bulk of nocturnal GH secretion happens, and that pulse is doing a non-trivial amount of the collagen synthesis and tendon remodeling work you’re attributing to PT plus possibly BPC. post-op cuff patients are running into side-sleeping restrictions, residual pain at end-range, and often tapering off whatever they were on for sleep aids during that exact window, all of which compress SWS without necessarily moving total sleep time. so a 7-8 hr number is consistent with anything from preserved architecture to substantially blunted GH output, and you can’t tell from duration alone. the bidirectionality is the part that makes it nastier to isolate: if SWS is compressed, the GH pulse blunts, remodeling slows, next-day stiffness and pain at end-range are worse, position constraints tighten again, and the next night’s SWS takes another hit. that’s not a one-way confound, it’s a feedback loop running in parallel to the protocol you were actually trying to measure. if you ever run something similar again, two draws on matched good and bad sleep nights, or a wearable that tracks SWS specifically rather than total sleep, would do more to clean up the picture than any tweak to the dosing schedule. that’s the variable that’s quietly moving in the background of basically every post-surgical repair log i’ve seen on this forum, and almost nobody is tracking it at the resolution it deserves.
The 12hr split logic holds - you’re right that local exposure continuity is the point, not peak AUC. Where the read gets murkier is the supplier switch at week 3. If the first BAC water was causing site irritation, your weeks 1-3 tissue environment was actively inflamed relative to weeks 3-4. You didn’t run one protocol, you ran two back-to-back, and the seam lands right in the middle of the measurement window.
the ‘continuity principle’ critique of the 8/16 split is the sharpest part of this post, bc if local tissue effect is your rationale, a 16hr exposure gap undercuts it. 11 deg flexion on 3x weekly PT is within normal PT-only recovery curves post-rotator-cuff repair, so you can’t extract a BPC signal from that delta without a no-peptide control. BAC water as a confound is chronically underlogged.
Supplier switch at week 3 is the detail I’d pull out. Two different BAC water batches across a four-week run means weeks 1-3 and week 4 aren’t running the same protocol, even if the declared peptide values matched. That’s another variable stacked on top of PT, not just a footnote. 12hr split logic is sound.
“anyone telling you they can isolate it without a no-PT control period is selling you something” - this is the part i keep coming back to, three weeks into my own run for a labrum that never healed right. same situation here, different joint. rom’s up maybe 15 degrees overhead and pain scores dropped maybe 4 points on my usual 0-10 scale, but sleep went from fragmented 4-5 hours to solid 6-7 in the same window, and i genuinely cannot say which one is pulling what. that confound is everywhere in these logs if you look for it. your 11 degree flexion gain over four weeks is real data, but you’re right that the PT and sleep were running parallel the entire time, and nobody wants to hear that because it makes the peptide story messier than the forums like. the 12hr split reasoning makes sense to me intuitively, for what that’s worth from someone still figuring out injection depth.
The 12-hour split reasoning is sound, and I’d push back on the 8/16 pattern the same way you did. Where I’d add a wrinkle: week 8 post-surgical is a different tissue context than tendinopathy, and most BPC protocols people cite are built around the latter. Organized collagen deposition in a repaired tendon is still active well past month 2, which means your run may have landed during a window where BPC’s effects on fibroblast signaling matter quite a bit more than the community’s standard 6-week framing accounts for.
the 12 vs 8/16 split argument is reasonable on its face, and “you want repeated exposure at the site, not stacked AUC” is actually a decent articulation of why local subq beats systemic for tendon work. but the framing buries the part worth examining: four weeks is short. not short in a “you needed more time” sense, but short in a “week 4 is a hint, not a signal” sense. the real depth on BPC for rotator work tends to show up weeks 5-7 in my experience, which means your run ended right as you might have started separating signal from PT noise. also the supplier switch at week 3 is a variable you listed but didn’t really account for. different BAC water formulation mid-run changes the local pH environment at the injection site, which isn’t nothing when you’re measuring site-proximal tissue response. 11 deg flexion gain is real, but the confidence interval on what drove it just got wider.
The PT confound at week 8 post-surgical is essentially unfixable, and that’s different from tendinopathy where you could in principle run a deload period to isolate the peptide effect. Nobody’s doing that on a healing repair. fwiw 8 deg ER over four weeks also falls within what PT alone produces at that stage of cuff recovery, so “variable isolation matters more” lands correctly. The 12hr split rationale holds: repeated local exposure is the point, not AUC stacking, and anyone running 8/16 hasn’t really thought through what continuity is supposed to mean.
the proximity-to-injury rationale you’re using is probably right, but the mechanism supporting it might be different than what most threads cite. BPC has documented substance P modulation in rodent models, which puts part of its action in neuromodulation territory, not purely tissue growth signaling. if that holds in humans (open question, nothing published cleanly confirming it in a surgical population), dosing subq near the site isn’t just about maintaining local peptide concentration, it’s potentially touching pain signaling in the nerve bed around the repair. rotator cuff repairs are actually a decent test case for this bc you’ve got both mechanical tissue damage and nerve involvement from the surgery and the original injury itself. doesn’t change your isolation problem at all, PT still confounds every degree you logged, but “why proximity matters” has more mechanistic support than the AUC argument alone gives it. worth naming separately imo.
the BAC water switch at week 3 is the thing i keep snagging on - if the irritation settled after that change, you’ve also got a different local tissue environment going into the back half of the run, which makes those week 12 numbers harder to read cleanly. the 12hr split reasoning holds up to me though. the variable isolation point kind of absorbs everything else here, which is maybe the whole lesson.
The window conclusion at the end has the same isolation problem as the attribution question - you named one but not the other. If PT 3x/wk is enough of a confounder to prevent clean BPC attribution, it’s also enough to prevent any conclusion about dosing windows, because you ran one protocol, not a comparison. The case for 12hr over 8/16 is logically coherent on the local-exposure principle - shorter gaps, repeated tissue-level concentration, no 16hr dropout in whatever regional effect BPC actually produces - but coherent rationale isn’t measured outcome. What you logged is that 12hr + PT 3x/wk + 7-8 hrs of sleep produced 11 degrees of flexion. It doesn’t tell you what 8/16 would have done under the same PT load. The dosing window may matter less, but you don’t have the data to say so.