Choose Injectable Delivery When: Maximum bioavailability and systemic distribution are required Your peptide has a molecular weight exceeding 6,000 Da Precise dosing and reproducible pharmacokinetics are necessary Youre using peptides for bodybuilding or muscle growth The peptide lacks CNS targets Choose Nasal Delivery When: Direct CNS delivery and blood-brain barrier bypass are therapeutic objectives Your peptide is small (under 6,000 Da) and shows adequate nasal bioavailability Rapid onset of action (minutes) is clinically valuable Patient compliance and comfort are primary concerns Youre using neurological peptides like Semax or Selank The FDA has approved several intranasal peptide formulations, including ZAVZPRET for acute migraine treatment, validating this delivery route as pharmaceutically viable
The arginate (arginine salt) form demonstrates improved stability in gastric acid, making it better suited for oral administration with bioavailability exceeding 90% compared to roughly 3% for standard acetate taken orally
Proper reconstitution technique is crucial to maintain the hormone's potency
Throughout this article, Ill distinguish between what we know, what we think, and what we commonly observe in practice
In recent years peptides have become widely known through the blockbuster success of GLP-1 medications, which the FDA has approved for treating obesity and diabetes
