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  Peptide Sciences Tirzepatide vs Semaglutide vs Retatrutide – A Research
  Comparison
  The incretin peptide science tirzepatide family has expanded dramatically over the past decade.
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  pathways. Understanding their differences – receptor profiles,
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  also offer similar compounds. However, as emphasized in our
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  Three Peptides, Three Mechanisms
  At a Glance Comparison Table
  Feature Semaglutide Tirzepatide Retatrutide
  Receptor targets GLP-1 only GLP-1 + GIP GLP-1 + GIP + glucagon
  Number of agonists Single Dual (two) Triple (three)
  Half-life (animal models) ~7 days ~5 days ~6 days
  Molecular weight (Da) 4,113.6 4,813.4 ~4,900
  Amino acid length 31 39 ~40
  Peptide Sciences™ purity ≥99% ≥98.5% ≥98%
  Primary research use Selective GLP-1 studies Dual pathway mapping Triple-receptor signaling
  Fatty acid modification C18 at Lys26 C20 at Lys20 C18/C20 hybrid
  DPP-4 resistance Yes (Aib substitutions) Yes (Aib substitutions) Yes (Aib substitutions)
  SKU PS-SEMA-5mg PS-TIRZ-10mg PS-RETA-10mg
  The Incretin System: Background for Researchers
  Before diving into each peptide, a brief overview of the
  incretin system is helpful.
  
  Incretins are gut-derived hormones that potentiate insulin secretion in response to meals.
  
  The two primary incretins are:
  
  Hormone Receptor Primary Effects Secreted By
  GLP-1 (Glucagon-Like Peptide-1) GLP-1R Insulin secretion, satiety, gastric emptying L-cells (ileum, colon)
  GIP (Glucose-dependent Insulinotropic Polypeptide) GIP-R Insulin secretion, fat metabolism,
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