PeptideSearch

FGL

Animal studies only

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Almost all the research is in animals. We do not know if the same thing happens in people.

Compiled and reviewed by the PeptideSearch Editorial Team · Status checked 2026-08-04

Also called FG Loop peptide / FGL-L

A peptide copied from a nerve cell adhesion protein, studied in rodents for memory.

The basics

What is it?
FGL mimics a loop of NCAM, a protein nerve cells use to stick together. Rodent studies have looked at learning, memory and inflammation in the brain.

Official status: Not nominated for 503A compounding · Checked 2026-08-04

Can a doctor prescribe this?

Small pharmacy (503A)
Never put forward to FDA
Large outsourcing facility (503B)
Never put forward to FDA

Not FDA approved and not on the U.S. compounding list. A doctor cannot prescribe it.

503A is a pharmacy making a single prescription for one patient. 503B is a facility making batches. They are governed by separate lists. Where a category is shown, it is a position on the FDA's list of substances that have been put forward and are still being worked through — not the final list, which is set by rulemaking. Category 1 means the FDA does not plan to act against a pharmacy that makes it while the review runs.

Lab suppliers we list: 2

Doses used in research

Taken word for word from the studies and trials listed on this page. This is not a recommendation and not a dose for anyone to take.

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