● pepmg Research Desk · Peer-reviewed evidence review
What the research says about FGL
A neutral review of FGL, an NCAM-derived mimetic peptide studied in cell and animal models of synaptic plasticity and neural signaling. Research use only.
Preclinical only — Animal or in-vitro studies only — no controlled human trials. This describes the state of the published literature, not a claim that this compound works, is safe, or is for human use. Research use only.
The short version
- FGL is a synthetic peptide derived from the fibroblast-growth-factor-receptor binding region of neural cell adhesion molecule (NCAM) [1].
- Published studies report synaptic, inflammatory-signaling, and neural-stem-cell endpoints in cultured cells and rodents [1][2][3].
- The evidence is preclinical. These findings do not establish cognitive, neurologic, or safety effects in people. Research use only.
What FGL is
FGL, also described as the NCAM FG-loop peptide, is a synthetic NCAM mimetic designed around a binding region involved in fibroblast growth factor receptor signaling [1]. It is investigated as a laboratory probe of neuronal signaling and plasticity.
It is not an approved medicine, and vendor listings are not evidence that a product matches material used in the cited experiments.
What preclinical studies measured
Preclinical onlyAn early study reported effects on synapse formation, presynaptic function, and memory-task performance in rats, alongside experiments in cultured hippocampal neurons [1]. A later rat study examined hippocampal inflammatory signaling and reported modulation involving IGF-1 and interferon-gamma [2].
Another study assessed primary neural stem cells and adult rats, reporting changes in cell proliferation and differentiation-related endpoints [3]. These are mechanistic and animal findings, not clinical outcomes.
Evidence and safety boundary
Preclinical onlyNo controlled human trial was identified in the curated evidence. Reviews discussing FGL do not substitute for human exposure or adverse-event data.
The preclinical label is therefore the evidence ceiling. This page provides no dosing, efficacy, or safety recommendation.
Evidence boundary
What this research cannot tell us
- The curated experiments use cultured cells and rodents, so their findings cannot establish clinical outcomes in people [1][2][3].
- No controlled human efficacy or safety trial was identified among the directly relevant studies curated for this review [1][2][3].
- Results from rodent memory tasks, signaling assays, and neural-stem-cell models cannot be assumed to translate to humans [1][2][3].
Sources · 3
- A synthetic neural cell adhesion molecule mimetic peptide promotes synaptogenesis, enhances presynaptic function, and facilitates memory consolidation.
- A synthetic NCAM-derived mimetic peptide, FGL, exerts anti-inflammatory properties via IGF-1 and interferon-gamma modulation.
- The synthetic NCAM mimetic peptide FGL mobilizes neural stem cells in vitro and in vivo.
pepmg summarizes the peer-reviewed literature and links to every source — it sells nothing, ships nothing, and gives no medical or human-use guidance. Don't just trust this summary: follow any citation to its source and read it yourself. Research use only.