Research catalog comparison
Semaglutide vs Tirzepatide
Semaglutide and tirzepatide appear in many of the same searches, but their receptor profiles are not the same. Peptide Plus tracks research-supplier listings, not retail-pharmacy prices; this comparison focuses on like-for-like catalog data and links to the evidence collected for each molecule.
Live catalog snapshot
In-stock listings only
Semaglutide
- Lowest list price
- $20.00
- 5mg
- Suppliers
- 39
- Active offers
- 97
- Listed quantities
- 26
Tirzepatide
- Lowest list price
- $22.99
- 5mg
- Suppliers
- 53
- Active offers
- 192
- Listed quantities
- 48
Lowest list prices can represent different quantities or forms and are not a direct unit-price comparison. The detailed pages show shipping, coupons, package details, and matching quantity options.
Key differences at a glance
| Comparison | Semaglutide | Tirzepatide |
|---|---|---|
| Receptor profile | A GLP-1 receptor agonist. | A dual GIP and GLP-1 receptor agonist. |
| Price comparison scope | Research-supplier listings grouped by labeled amount and form. | Research-supplier listings grouped by labeled amount and form. |
| Important limitation | Catalog prices should not be read as prescription or pharmacy pricing. | Catalog prices should not be read as prescription or pharmacy pricing. |
Research summary starting points
Semaglutide
Semaglutide is a long-acting glucagon-like peptide-1 (GLP-1) receptor agonist with 94% structural homology to human GLP-1, featuring three key modifications that provide enzymatic stability and extended half-life of approximately one week. Approved by the FDA in multiple formulations (Ozempic for diabetes, Wegovy for obesity, Rybelsus as oral formulation), it functions by enhancing glucose-dependent insulin secretion, suppressing glucagon release, delaying gastric emptying, and reducing appetite through central and peripheral mechanisms. Semaglutide has demonstrated significant cardiovascular benefits with 20-26% risk reduction in major adverse cardiac events, substantial weight loss outcomes (14-17% body weight reduction), and improvements in glycemic control with HbA1c reductions of 1.0-1.8%. Despite its FDA-approved status, semaglutide has entered gray markets as a research chemical sold without prescription, with quality testing revealing dramatically substandard purity levels (7-14% versus claimed 99%), endotoxin contamination, and significant safety concerns regarding compounded and unregulated sources.
Read the sourced Semaglutide overview →Tirzepatide
Tirzepatide is a synthetic 39-amino acid polypeptide conjugated with a C20 fatty diacid moiety that functions as the first-in-class dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist. Approved by the FDA in May 2022 for type 2 diabetes (brand name Mounjaro) and November 2023 for chronic weight management (brand name Zepbound), it demonstrates superior glycemic control and weight reduction compared to selective GLP-1 agonists. Clinical trials show dose-dependent weight loss of 15-21% and HbA1c reductions up to 2.58% over 40-72 weeks. The compound exhibits biased agonism, with greater affinity for GIP receptors and preferential cAMP signaling at GLP-1 receptors, contributing to enhanced beta-cell function and insulin sensitivity. In gray market contexts, tirzepatide is sold as a research chemical with significant quality and safety concerns, as unapproved versions lack FDA oversight for purity, sterility, and accurate dosing.
Read the sourced Tirzepatide overview →Common comparison questions
Are Semaglutide and Tirzepatide the same compound?
No. Semaglutide and Tirzepatide are distinct compounds. Compare their identities and evidence separately.
What is the lowest listed Semaglutide price?
The lowest currently indexed in-stock Semaglutide listing starts at $20.00 for 5mg. Compare matching quantities because package size and form affect price.
What is the lowest listed Tirzepatide price?
The lowest currently indexed in-stock Tirzepatide listing starts at $22.99 for 5mg. Compare matching quantities because package size and form affect price.
Comparison scope
Peptide Plus compares research-supplier catalog data. This page does not provide medical advice, dosing guidance, or a claim that either compound is appropriate for human use. All listed products are for research purposes only.