@Sarah Frazer Chat explains it like this: The short answer is that peptide prices are driven by a combination of how difficult they are to manufacture, how much is produced, purity requirements, stability, and market demand. A 10 mg vial of one peptide may cost $25 while another 10 mg vial costs $300, even though the amount appears identical. Here are the biggest factors: 1. Complexity of the peptide ⭐⭐⭐⭐⭐ This is often the biggest factor. Peptides are built one amino acid at a time using solid-phase peptide synthesis. A peptide with: - 8 amino acids may require 8 synthesis steps. - 37 amino acids may require 37 steps. Each additional step increases: - Time - Reagent cost - Risk of failed synthesis - Purification difficulty For example: - Epithalon (4 amino acids) is relatively inexpensive. - MOTS-c (16 amino acids) costs more. - Tesamorelin (44 amino acids) is much more expensive because long peptides are considerably harder to produce. - SS-31 $$$ Specialized sequence with modified chemistry