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.

FGL

Animal studies only

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

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.

No. Pharmacies are not on record as being allowed to make this into a medicine.

The FDA has not approved this as a medicine.

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

Official status: Not on the 503A bulks list. Checked 2026-08-04.

Lab suppliers we list: 2

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.

These are doses given to animals, usually per kilogram of body weight. They do not convert directly to a human dose.

See source wording
mice · by mouth · for 14 weeks
Effects of Bioconverted Guava Leaf (<i>Psidium guajava</i> L.) Extract on Skeletal Muscle Damage by Regulation of Ubiquitin-Proteasome System and Apoptosis in Type 2 Diabetic Mice.International journal of molecular sciences · 2025
“Diabetes was induced by a high-fat diet with a two-time streptozotocin (STZ) injection (60 mg/kg BW) in male C57BL/6J mice.”