Why cycling matters

Most growth-hormone-axis peptides and several recovery-focused compounds have evidence of receptor desensitization or feedback-mediated downregulation when used continuously. The patient's first cycle often produces the strongest results. Subsequent cycles benefit from the body returning to a less-adapted state before re-initiation.

Cycling is not universally required. GLP-1 protocols are typically continuous. NAD protocols vary by clinician preference. Recovery-focused peptides like BPC-157 and TB-500 are often used in 4-to-8-week courses with breaks between.

Standard cycle structures

Three patterns cover most patients:

1. 8 weeks on, 4 weeks off. Common for GH-axis peptides (sermorelin, CJC-1295, ipamorelin) where receptor desensitization is a concern.
2. 6 weeks on, 2 weeks off. Common for recovery-focused protocols where the patient's training cycle drives the timing.
3. Continuous with quarterly review. Used for GLP-1 and some longevity stacks where ongoing administration is the protocol.

The right pattern is the one that matches the indication, the patient's response, and the clinical evidence for the specific peptide.

What to monitor across cycles

For GH-axis peptides:

• Subjective response: energy, sleep quality, recovery from training
• Body composition (waist circumference, weight) if relevant to indication
• IGF-1 levels if labs are part of your protocol

For recovery-focused peptides:

• Injury or recovery indication progression
• Functional capacity in the relevant domain

For GLP-1s:

• Weight trajectory
• Gastrointestinal tolerance
• Protein intake (decline is the most common patient-side risk)
• HbA1c at 3-6 months if metabolic monitoring is part of the protocol

How to talk to patients about cycle breaks

Patients sometimes resist the off period, especially if they are feeling effects from the on cycle. Useful framing:

"The off period is what makes the next cycle work. If we run continuously, you will see diminishing returns over months. Two to four weeks off keeps the receptor sensitivity high so the next cycle gives you what this one did."

Most patients accept this readily. Documenting the cycle structure in the chart prevents the question from recurring at every refill request.

When to deviate

Patient response varies. Some patients tolerate longer continuous courses without apparent diminishing returns. Others need shorter on-periods to maintain effect. Treat the cycle structure as a starting heuristic, not a rule. Document your reasoning when you deviate.