Off-cycle — what actually happens in the 4-week break

You 'know it worked' because the next cycle's week-1 response feels like the first cycle's week-1 response. If week 1 of cycle 2 feels blunted, your break was too short.

IGF-1 decays over about 2 weeks back toward baseline (it has a longer half-life in tissue than plasma). Receptor resensitization for GHSR takes 3-4 weeks for Ipa. Pituitary GH stores refill over similar window.

If you lab IGF-1 at end of cycle + 2 weeks off + 4 weeks off, you'll see the decay curve. Once it's back to baseline you're fully reset.

Another thing that happens: your baseline sleep often gets a temporary bump the first week off as sleep architecture rebounds, then settles back to 'normal' by week 3. Don't mistake that for the cycle still 'working.'

This is exactly what I needed. Thanks.

Real talk, 4 weeks is kinda the magic number but it's not a hard rule. I've run 3 week breaks and felt decent responsiveness week 1 of the next cycle, but yeah the receptor bounce back takes the full 4 to really optimize. The sleep thing stackbuilder mentioned is legit though, don't get fooled by feeling rested and think your GH is still elevated when it's just your CNS recovering. If you actually care about this stuff lab it, otherwise just feel out cycle 2 week 1 and adjust from there.