Also known as: NCAM FGL peptide, Fibroblast Growth Factor Loop, FGL
FGL Loop is a neurotropic peptide research compound (not FDA-approved for human use) studied for synaptogenesis. FGL is a peptide that mimics NCAM — the brain's cell-to-cell communication molecule — to trigger synapse formation and improve memory in rodent models by activating the same growth factor pathways. Research dose: 1–5 mg daily. Half-life: not established. Available from COA-verified vendors with code PEPTIDEX for up to 20% off.
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Sourcing data for FGL Loop is updating.
We verify new listings weekly — check back soon.
Synthetic peptide derived from the fibronectin type III (F3) module of Neural Cell Adhesion Molecule (NCAM). Mimics the homophilic binding of NCAM, activating FGFR (fibroblast growth factor receptor)
⚠️ Educational only · Not medical advice · Consult a doctor · Most peptides are research-only / not FDA-approved for human use
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Compare All VendorsFGL Loop (also known as NCAM FGL peptide, Fibroblast Growth Factor Loop, FGL) is a prominently researched experimental compound classified strictly within the Neurotropic Peptide framework. Operating primarily through advanced pharmacological pathways, its core mechanism of action is as follows: it synthetic peptide derived from the fibronectin type III (F3) module of Neural Cell Adhesion Molecule (NCAM). Mimics the homophilic binding of NCAM, activating FGFR (fibroblast growth factor receptor) signaling downstream, which promotes synaptogenesis, long-term potentiation (LTP), and memory consolidation. In rodent models improves spatial memory and reduces age-related synaptic loss. with an established metabolic degradation profile, In preclinical investigative trials and independent academic studies, researchers utilizing FGL Loop have documented significant, quantifiable biological outcomes, primarily focusing on synaptogenesis, memory enhancement, ncam-mediated neuroprotection. Typical research protocols investigate administering 1000 to 5000mcg via subq pathways daily. However, it is critically important to understand that while FGL Loop demonstrates profound physiological potential in highly controlled laboratory settings, it remains classified strictly as a research chemical and has not been approved by the United States Food and Drug Administration (FDA) for human therapeutic, diagnostic, or dietary consumption. Independent chemical analysis via rigorous third-party Certificate of Analysis (COA) testing utilizing High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) remains the industry gold standard for verifying its base elemental stability when reconstituted appropriately in sterile bacteriostatic water.
Synthetic peptide derived from the fibronectin type III (F3) module of Neural Cell Adhesion Molecule (NCAM). Mimics the homophilic binding of NCAM, activating FGFR (fibroblast growth factor receptor) signaling downstream, which promotes synaptogenesis, long-term potentiation (LTP), and memory consolidation. In rodent models improves spatial memory and reduces age-related synaptic loss.
Cambon et al.: FGL peptide enhances LTP in hippocampal slices and improves spatial learning in rodents via FGFR-dependent synaptogenesis, establishing NCAM-mimetic peptides as cognitive enhancers.
PreclinicalReview of NCAM-derived peptides including FGL, documenting their capacity to promote synaptogenesis, neuroprotection, and memory retention in animal models of aging and neurodegeneration.
Preclinical⚠ PRECLINICAL RESEARCH ONLY. No completed human clinical trials. All data from rodent models. No established human pharmacokinetics, dosing protocol, or safety profile. Research use only.
See our evidence grading methodology for how we evaluate and grade peptide safety data.
⚠️ For educational purposes only. Not medical advice. Consult a healthcare professional before using any peptide.
Rodent study doses only. No validated human protocol. Research use only.
Weeks 2–4
Synaptic density and memory improvements in rodent models
| Side Effect | Incidence | Severity |
|---|---|---|
Unknown in humans No human safety data | Not established | rare |
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⚠️ Educational only · Not medical advice · For research use only. Information on this page is compiled from peer-reviewed literature and is intended strictly for educational and informational purposes. Peptides discussed may be unapproved research chemicals — consult a licensed healthcare professional before considering any peptide compound. Read our full disclaimer
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