B12 Injection vs FGL
A side-by-side research comparison of B12 Injection and FGL across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | B12 Injection | FGL |
|---|---|---|
| Full name | Methylcobalamin (Vitamin B12) Injectable | FGL (NCAM-Derived Peptide) |
| Category | Cognitive & Nootropic | Cognitive & Nootropic |
| Status | Prescribed / OTC | Research compound |
| Mechanism | Cofactor for methionine synthase (DNA methylation) and methylmalonyl-CoA mutase (energy metabolism). Supports myelin synthesis, neurotransmitter production, and red blood cell formation. | Mimics NCAM FG loop interacting with FGFR1 to promote LTP, neurite outgrowth, neuronal survival, and presynaptic function enhancement. |
| Molecular weight | 1344.38 Da | ~1,800 Da |
| Half-life | ~6 days | 4-8 hours |
| Bioavailability | ~100% IM/SC | Moderate (SubQ, partial BBB crossing) |
| Typical dose | 1000-5000 mcg | 1-5 mg/kg (research) |
| Frequency | 1-3x per week | Daily or every other day |
| Route | Intramuscular or subcutaneous injection | Subcutaneous |
B12 Injection reported benefits
- Increased energy
- Improved cognitive function
- Nerve repair
- Red blood cell production
- Better sleep
- Mood enhancement
FGL reported benefits
- Synaptic plasticity
- LTP facilitation
- Memory improvement
- Neurotrophic effects
- FGFR activation
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Research and educational reference only. Not medical advice.