Understand the source comparison
“`text id="j6p2mv": Research-Grade Peptides Comparison
GLP-1 Analogues (semaglutide, liraglutide) ≥97% −20°C, desiccated 28–56 days at 2–8°C Metabolic research, appetite regulation studies Fatty acid modifications extend stability significantly. Semaglutide remains active 56 days post-reconstitution versus 48 hour
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- GLP-1 Analogues (semaglutide, liraglutide)
- ≥97%
- −20°C, desiccated
- 28–56 days at 2–8°C
- Metabolic research, appetite regulation studies
- Fatty acid modifications extend stability significantly. Semaglutide remains active 56 days post-reconstitution versus 48 hours for native GLP-1
- Growth Hormone Secretagogues (GHRP-2, GHRP-6)
- ≥95%
- 14–21 days at 2–8°C
- Growth hormone pulsatility studies, muscle anabolism research
- D-amino acid substitutions at positions 2 and 6 prevent enzymatic degradation. Critical for in vivo studies where peptidase activity is high
- Cognitive Peptides (Semax, Selank)
- ≥98%
- 21–28 days at 2–8°C
- Neuroprotection studies, anxiety modulation research
- Acetylation at the N-terminus extends CNS penetration and half-life. Both cross the blood-brain barrier more efficiently than unmodified ACTH fragments
- Mitochondrial Peptides (MOTS-C, Humanin)
- ≥96%
- −80°C preferred, −20°C acceptable
- 7–14 days at 2–8°C
- Cellular energy metabolism, age-related mitochondrial dysfunction
- MOTS-C's 16-amino-acid sequence makes it prone to aggregation in aqueous solution. Reconstitute fresh for each experiment rather than storing long-term