Peptide Cycling Guide: How Long to Run BPC-157, TB-500, and GH Peptides (and When to Stop)
Why Cycling Matters
Peptides work by binding to receptors in your body. When you expose those receptors to the same signal day after day for months, they can downregulate and produce less response to the same dose. This is called receptor desensitization, and it's the primary reason peptides need cycling.
The practical effect: your peptide stops working as well. The healing slows down, the GH pulses get weaker, or the recovery benefits plateau. A planned off-period lets your receptors reset so the peptide is effective again when you restart.
Cycling also gives your body a break from low-level metabolic effects and helps you assess your baseline. Are you actually better, or are you masking symptoms with continuous peptide use?
Compound-Specific Cycling Protocols
BPC-157
BPC-157 is most commonly run for a specific injury. Once the injury has healed (or significantly improved), stop. If you're running it for general gut health or systemic recovery, cap your cycle at 8 weeks and take at least 2 weeks off before restarting.
Most community protocols follow 4 weeks on / 2 weeks off for mild issues, or 8 weeks on / 4 weeks off for chronic injuries. Longer cycles (12+ weeks) show diminishing returns in anecdotal reports.
TB-500
TB-500 is often used with a loading protocol: higher doses (2–5 mg/week) for the first 2-4 weeks, then dropping to a maintenance dose (750 mcg–2 mg/week) for another 4-8 weeks. Total cycle typically runs 6-12 weeks.
Off periods for TB-500 tend to be longer (4-8 weeks) because of its long-acting systemic effects. If you're stacking with BPC-157, you can stagger the cycles so you're never completely off both. See our BPC-157 vs TB-500 comparison.
CJC-1295 / Ipamorelin (GH Secretagogues)
GH secretagogues stimulate your pituitary to release growth hormone. The concern with extended use is pituitary desensitization. Your pituitary can produce less GH in response to the same signal over time, so cycling helps preserve responsiveness.
CJC-1295 with DAC has a longer half-life (~8 days) and may need longer off periods. CJC-1295 without DAC (mod GRF 1-29) clears quickly and is often stacked with Ipamorelin for synergistic GH release.
Track your cycles automatically
- Set on/off cycle timers for each compound
- Get alerts when it's time to cycle off
- Log notes to track effectiveness over time
Tesamorelin
Tesamorelin is usually managed as a clinician-guided protocol, not a strict self-directed cycle. In practice, many people review results around the 8-12 week mark and adjust based on labs and symptoms.
If you include tesamorelin in a broader stack, keep your tracking disciplined: dose timing, symptom notes, and regular biomarker reviews matter more than fixed internet cycle templates.
Compounds That Don't Need Cycling
Not everything needs to be cycled. Some medications are specifically designed for continuous, long-term use:
- GLP-1 agonists (semaglutide, tirzepatide): designed for continuous use. Stopping causes rebound appetite. See our GLP-1 maintenance guide for tapering strategies.
- Testosterone (TRT): continuous use under medical supervision. Cycling off TRT crashes your testosterone and can cause major side effects.
- HCG on TRT: often taken continuously alongside testosterone to maintain fertility/testicular volume.
- Thyroid medications: continuous prescribed use.
- Enclomiphene: typically continuous under medical supervision as a TRT alternative.
Signs You Need to Cycle Off
Even within recommended cycle lengths, pay attention to these signals that it's time for a break:
- Diminished response: The same dose is no longer producing the same effect as weeks 1-4
- New side effects: Side effects appear or worsen at a stable dose
- Goal achieved: Injury healed, recovery complete. Don't run peptides "just because"
- Blood work changes: IGF-1 or fasting glucose moving outside your target range
- Water retention or bloating: Common with longer GH peptide runs
How to Track Your Cycles
The biggest mistake people make with cycling isn't the protocol. It's forgetting when they started or when they're supposed to stop. Here's what to track:
- Cycle start date: when you took your first dose of this cycle
- Planned cycle length: decide before you start, not mid-cycle when you "feel fine"
- Off-period length: commit to the off-period. It's tempting to restart early.
- Notes on effectiveness: log how you feel at weeks 2, 4, 6, and 8 to optimize future cycles.
- Side effects: track side effects so you can adjust dose or duration next cycle
Never forget a cycle transition
- Cycle on/off alerts for every compound
- Dose logging with notes and side effects
- Progress photos tied to your protocol
Quick Reference: Cycling Guidelines
| Compound | On Period | Off Period | Notes |
|---|---|---|---|
| BPC-157 | 4–8 weeks | 2–4 weeks | Stop when healed |
| TB-500 | 6–12 weeks | 4–8 weeks | Loading + maintenance |
| CJC-1295/Ipamorelin | 8–12 weeks | 4–8 weeks | Fasted dosing |
| Tesamorelin | 8-12 week review | Provider-guided | Reassess with labs |
| GHK-Cu | 8–12 weeks | 4 weeks | Skin/tissue focus |
| PT-141 | As needed | N/A | Not for daily use |
| Semaglutide | Continuous | N/A | Taper, don't cycle |
| Testosterone (TRT) | Continuous | N/A | Medical supervision |
Frequently Asked Questions
Disclaimer
This guide is for educational purposes only and does not constitute medical advice. Cycling protocols are based on community experience and limited research data. Consult a healthcare provider before starting, stopping, or modifying any peptide protocol. Individual responses vary significantly.
Ready to track your protocol?
- Smart reminders so you never miss a dose
- Track weight, photos, and progress over time
- Medication level curves for every compound