What Is True Body Recomposition?
Most protocols optimize for either fat loss or muscle gain — rarely both. Traditional caloric restriction triggers muscle catabolism alongside fat loss. Traditional bulking adds fat alongside muscle. The metabolic conditions required for each are, on the surface, opposed.
True body recomposition changes the equation by targeting four biological pathways simultaneously: anabolic signaling for muscle protein synthesis, lipolytic signaling for fat mobilization, growth hormone optimization (which drives both), and recovery optimization to allow continuous training stimulus. Peptide combinations are uniquely suited to this because each compound in a well-designed stack addresses a different piece of this puzzle.
The Core Recomposition Mechanisms
Each compound in the recomp stack operates through a distinct biological pathway — no receptor overlap, no redundant signaling.
Not just hypertrophy — actual new muscle fiber creation via satellite cell activation. IGF-1 LR3 binds the IGF-1 receptor at 3× the potency of native IGF-1 and has a 20–30 hour half-life, sustaining anabolic signaling far beyond endogenous pulses. Satellite cells proliferate and fuse with existing fibers, increasing the total number of myonuclei. This is what separates IGF-1 LR3 from other anabolic approaches — the gains in fiber number are permanent structural changes.
View Compound4–8× GH pulse amplification drives both lipolysis AND muscle protein synthesis — GH is inherently dual-purpose. CJC-1295 (no DAC) acts on GHRH receptors; Ipamorelin mimics ghrelin at the GHS-R1a receptor. The two signals are additive and synergistic: the GHRH analog extends the pulse duration while the GHRP increases pulse amplitude. Timed pre-sleep, these peptides amplify the largest natural GH pulse of the 24-hour cycle, maximizing fat mobilization from adipose tissue and driving muscle protein synthesis during recovery.
View CompoundMetabolic hormone signaling reduces adipose tissue while preserving metabolically active lean mass. GLP-1 receptor agonists slow gastric emptying, reduce appetite signaling centrally, and improve glucose disposal — all of which create the caloric environment for fat loss. When stacked with GH-axis peptides, the dual signal creates a genuine recomposition environment: GLP-1 handles the fat side, growth hormone handles the muscle side. Retatrutide's additional glucagon agonism adds direct lipolytic signaling to adipocytes.
View CompoundTraining frequency × volume = results. BPC-157 accelerates inter-session recovery by upregulating VEGF (vascular endothelial growth factor), increasing tendon fibroblast proliferation, reducing local inflammation, and modulating the nitric oxide system. In practical terms: joint discomfort decreases, training sessions that previously required 48–72 hours of recovery can be repeated in 24–36 hours. Higher total training load over a cycle means more mechanical stimulus for muscle protein synthesis and greater total energy expenditure — both essential for recomposition.
View CompoundTiered Stack Protocols
Protocols progress in complexity. Each tier adds compounds only when the foundation is established — start where your research experience warrants.
GH axis calibration, improved sleep quality, early body composition shifts
Improved body composition over 8–12 weeks, noticeably better sleep and recovery quality, subtle fat loss particularly around the midsection. A well-tolerated entry point with a strong tolerability profile for first-time users.
Add recovery optimization to support higher training frequency and volume
Faster inter-session recovery, reduced joint discomfort by weeks 2–3, improved training continuity. The GH axis foundation from the beginner stack is still driving body composition — the addition of BPC-157 allows the training load to increase, amplifying the recomp stimulus.
True muscle hyperplasia via satellite cell activation + sustained GH optimization + recovery
Measurable lean mass gains alongside continued fat reduction, strength increases from increased myonuclei density. IGF-1 LR3 is dosed post-training to exploit the window of elevated local IGF-1 sensitivity in trained muscles. This is a research-grade protocol for experienced users with baseline data.
Already on a GLP-1?
Here’s How to Preserve Muscle
Semaglutide, tirzepatide, and retatrutide can cause muscle wasting alongside fat loss — clinical trial data shows up to 25–40% of total weight loss can come from lean mass. In a pure fat loss context this is tolerated. In a recomposition context, lean mass protection is non-negotiable.
Adding CJC-1295/Ipamorelin to a GLP-1 protocol creates a recomposition environment: the GLP-1 handles fat loss, the GH axis handles muscle preservation and growth. GH specifically stimulates muscle protein synthesis while simultaneously enhancing lipolysis — complementary, not competing, with GLP-1 mechanisms.
This combination is the basis of the Fat Loss & Vascularity Stack. The research rationale is straightforward: GLP-1 receptor agonists create the caloric deficit environment, while elevated GH partitions available energy toward muscle preservation and fat oxidation rather than allowing indiscriminate lean mass catabolism.
For retatrutide specifically — the triple agonist — the additional glucagon receptor agonism adds direct adipocyte lipolytic signaling. Stacking with CJC-1295/Ipamorelin at this level creates one of the most potent body composition research protocols currently studied.
6-Month Protocol Timeline
A phased approach builds the stack methodically — establishing response and tolerability at each stage before advancing. This is the approach experienced researchers use.
| Phase | Duration | Stack | Primary Goal |
|---|---|---|---|
| Foundation | Weeks 1–4 | CJC-1295/Ipamorelin only | GH axis calibration, baseline response assessment |
| Building | Weeks 5–12 | + BPC-157 | Add recovery optimization, increase training load |
| Advanced | Weeks 13–16 | + IGF-1 LR3 | Muscle hyperplasia, maximal recomp effect |
| Maintenance | Post-cycle | Reduced CJC/Ipa 3× weekly | Preserve structural gains during off-cycle period |
The Recomposition Stack Compounds
The complete stack page with product-level details, exact dosing schedules, cycle timing, and what to expect week by week.
Source Research-Grade Peptides
All compounds referenced in these protocols are available through our affiliate partner. Third-party tested, research-grade purity.
Shop All CompoundsFor research and laboratory use only. Not for human consumption.