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Synthetic peptides are engineered to improve bioavailability, target selectivity, and half-life, often surpassing the pharmacokinetic limitations of natural peptides. Vlieghe et al., Drug Discovery Today Do Natural and Synthetic Peptides Have Different Clearance Times

Storage requirements Lyophilized (powder) 20C up to 24 months Reconstituted 28C up to 21 days Literature Peer-reviewed research for laboratory background Annals of the New York Academy of Sciences 1997 PMID 9415996 Safer D et al

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Very concentrated solutions (40 mg/mL or higher) can be slightly thicker, which means they flow through the needle more slowly