Not medical advice. Talk to your provider before using any peptide.
Full disclaimerPeptide Schedule Research TeamReviewed Apr 20268 Citations
FGL (FG Loop Peptide)15 residuesEVYVVAENQQGKSKAEach bubble = one amino acid. Size = residue mass. Color = chemical class.FGL peptide targets FGFR1 signaling for neuroprotection and memory. Strong rodent data on hippocampal plasticity across 34 PubMed papers, but only 24 humans have ever received it (intranasal, Phase I only). Community SC dosing sits far below all studied doses.
1mcg · 5x/week
Summary: Add 2mL BAC water to your 5mg vial. Draw to < 0.1 units on a U-100 syringe for a 1mcg dose. This vial will last 5000 doses.
View side effects and safety warnings →
| Level | Dose / Injection | Frequency |
|---|---|---|
| Beginner | 1mg | 5x/week |
| Moderate | 1.5mg | 5x/week |
| Aggressive | 2mg | 5x/week |
The single most important thing: confirm your vendor is selling dimerized FGL(L), not the monomer. The monomer has inferior CNS penetration and is the wrong form entirely. Ask for a CoA specifying dimeric form and molecular weight around 3,476 Da. Reconstitution math for a 5 mg vial: add 2 mL bacteriostatic water to get 2.5 mg/mL. A 1 mg dose is 0.4 mL, which is 40 units on a U-100 insulin syringe. A 2 mg dose is 0.8 mL (80 units). For a 10 mg vial with 2 mL BAC water, you get 5 mg/mL. A 2 mg dose becomes 0.4 mL (40 units). Swirl gently for 15 or more minutes after adding water. FGL(L) is stubborn to dissolve. If you see particles that won't clear, discard the vial. HA-FGL from WholisticResearch (about $122 per vial) is a hyaluronic acid conjugate. Different compound entirely with zero published human data. Not interchangeable with FGL(L).
Dosing based on Dose extrapolated from Phase 1 safety study; clinical dosing protocol not established — 14 published references.View all sources →
Cross-check your FGL (FG Loop Peptide) reconstitution math with AI
Pricing updated 2026-04-09
Prices are estimates and vary by source, location, and prescription status.Full pricing breakdown →
Disclaimer: This curve is a simplified first-order exponential decay model. Actual pharmacokinetics vary based on injection site, individual metabolism, body composition, and other factors. Half-life values are approximate and based on available preclinical and clinical literature. Many research peptides lack formal human pharmacokinetic studies. This is for educational purposes only — not medical advice.
FGL peptide targets FGFR1 signaling for neuroprotection and memory. Strong rodent data on hippocampal plasticity across 34 PubMed papers, but only 24 humans have ever received it (intranasal, Phase I only). Community SC dosing sits far below all studied doses.
