FGL-Loop

FG Loop FGL is a synthetic peptide derived from the neural cell adhesion molecule (NCAM). It mimics natural brain signaling molecules to promote synaptic plasticity, neurogenesis, and neuroprotection — supporting cognitive function, mood regulation, and neural recovery.

🚫Shipping Restrictions: South Lake Pharmacy is not licensed to ship directly to the following states: Alabama, California, DC, Louisiana, Massachusetts, Michigan, Mississippi, Montana, Texas, Washington, and West Virginia.

Overview

FG Loop FGL peptide is a synthetic peptide derived from a specific sequence within the neural cell adhesion molecule (NCAM) — a protein fundamental to how neurons communicate, organize, and repair themselves. By mimicking the action of natural signaling molecules in the brain, FGL promotes synaptic plasticity, supports neurogenesis, and provides neuroprotective effects across a broad range of neurological applications. Delivered as a convenient intranasal spray on a 5-days-on, 2-days-off protocol, it is one of the most studied NCAM-derived peptides for cognitive enhancement and neural health support.

Feel

Cognitive fatigue, poor memory retention, low focus, mood instability, or neurological decline affecting daily performance

Want to support

Memory, learning, synaptic plasticity, neurogenesis, and long-term brain health and neuroprotection

Experience

Age-related cognitive decline, mood disorders, neurodegenerative conditions, or recovery from neural injury

Care about

A non-invasive intranasal peptide that works through NCAM signaling — a well-studied neurobiological pathway

Important: Compounded products are not FDA-approved nor evaluated by the FDA for safety, efficacy, or quality. This product requires a prescription from a licensed health professional. Information presented here is for educational purposes only. Must be 18 or older to order.

Mechanism & Properties

NCAM-Derived Signaling

Neural Cell Adhesion Molecule Peptide

FGL is derived from the FG loop region of the NCAM fibronectin type III module — a domain critical to how neurons form and maintain synaptic connections. By mimicking natural NCAM signaling, FGL activates intracellular pathways that promote neuronal survival, synaptic strengthening, and the formation of new neural circuits.

Synaptic Plasticity & Neurogenesis

Memory · Learning · Adaptation

FGL enhances long-term potentiation (LTP) — the cellular mechanism underlying memory consolidation — and promotes the generation of new neurons in the hippocampus. These effects translate directly into improved capacity for learning, memory retention, and cognitive adaptability in response to new challenges and environments.

Intranasal Delivery

5 Days On · 2 Days Off · Once Daily

Delivered as a nasal spray at 3.75 mg/mL, FGL is absorbed through the olfactory epithelium for direct CNS access, bypassing the blood-brain barrier. The 5-on/2-off weekly protocol is designed to maintain consistent receptor engagement while preventing receptor desensitization and preserving long-term efficacy.

All eligibility is reviewed by a licensed medical professional.

Simple. Medical. Personalized.

Medical intake

Answer a few online questions about your health history, lifestyle, and goals — no clinic visits required.

Provider evaluation

A licensed medical professional reviews your intake and determines the safest, most effective option for you.

Personalized plan

Custom treatment plan built around your unique health needs, goals, medical history, and biology.

Ongoing support

Stay connected with your care team for follow-ups, adjustments, and expert answers — all online.

FAQs

Dosage & Administration

Instill one spray in each nostril once daily, five days out of every seven. Prime the nasal spray before first use per your pharmacy's instructions. Tilt your head slightly forward, insert the nozzle gently into one nostril, and depress the pump while breathing in lightly through the nose. Repeat for the other nostril. Use on a consistent 5-on/2-off weekly schedule for best results. Do not exceed the prescribed dose. Your provider may adjust the protocol based on your individual response and therapeutic goals.

Precautions & Side Effects

FG Loop (FGL) is a compounded prescription peptide. It is not FDA-approved or evaluated by the FDA for safety, efficacy, or quality. A valid prescription from a licensed healthcare provider is required. Must be 18 or older to order. Not available for shipping to Alabama, California, DC, Louisiana, Massachusetts, Michigan, Mississippi, Montana, Texas, Washington, or West Virginia. Consult your provider before use if you have any existing neurological, psychiatric, or neurodegenerative conditions, or if you are taking any medications that affect CNS function.

Storage

Store FG Loop (FGL) nasal spray in the refrigerator at 36°F–46°F (2°C–8°C) to maintain peptide stability and potency. Keep the bottle tightly capped and protected from light when not in use. Do not freeze. Keep out of reach of children. Use within the beyond-use date specified on your prescription label from South Lake Pharmacy. Discard if the solution appears discolored or contains particulate matter.

The information and products provided on this website are for educational and wellness purposes only and are not intended to diagnose, treat, cure, or prevent any disease. All treatments require evaluation and approval by a licensed healthcare provider through a telemedicine consultation. Individual results may vary, and products carry potential risks and side effects. Certain products may not be evaluated by the U.S. Food and Drug Administration (FDA) unless explicitly stated. Services are provided by licensed physicians and nurse practitioners in states where they are authorized to practice, including California, Florida, Nevada, and other participating states. This service is not intended for medical emergencies. If you are experiencing an emergency, call 911 or seek immediate medical care. We take reasonable measures to protect personal health information in accordance with applicable privacy laws, including HIPAA. By using this website or its services, you agree to our Terms of Service, Privacy Policy, and Telehealth Consent. You must be 18 years of age or older to use this service.