Cyclic Glycine-Proline vs Semax
Moderate Research vs Well Studied
compatible Both offer neuroprotection and nootropic effects through distinct pathways
Molecular Data
Cyclic Glycine-Proline Semax
Weight 154.17 Da 813.93 Da
Half-life Extended stability (more stable than linear GPE precursor) 0.5-2 hours
Chain 2 amino acids (cyclic) 7 amino acids
Type Cyclic dipeptide (2,5-diketopiperazine) ACTH(4-10) synthetic analog
Key Benefits
Cyclic Glycine-Proline
01 Neuroprotection and cognitive enhancement
02 IGF-1 optimization
03 Cardiovascular support
04 Metabolic health improvement
05 Blood-brain barrier penetration
06 Convenient oral administration
Semax
01 Rapid brain delivery via intranasal route
02 Rapidly increases BDNF levels
03 Extensive clinical research in Russia
04 Easy self-administration
05 Modulates dopamine and serotonin systems
06 Neuroprotective effects
Dosing Protocols
Cyclic Glycine-Proline
20-100 μg daily (or 300mg blackcurrant extract 2x daily) / Once daily, preferably in the morning
Semax
300-600mcg per dose (up to 1000mcg for intensive use) / 1-2x daily (morning recommended for cognitive boost)
Research protocol 500-750mcg 1x daily
Intensive protocol 750-1000mcg 1-2x daily
Side Effects
Cyclic Glycine-Proline
Semax
Mild nasal discomfort (nasal route)
Possible nasal sensation upon administration
Contraindications
Consult healthcare provider if taking IGF-1 or growth hormone medications
Limited long-term human data available
Not studied in pregnancy
Pregnancy or breastfeeding
Known peptide allergies
Do not exceed 4-week continuous use without medical supervision
Research Evidence
Cyclic Glycine-Proline Semax
Status Moderate Research Well Studied
References 4 studies 4 studies
Latest — 2021
FDA Approved No No
This comparison is for educational and research purposes only. Consult a healthcare professional before use.