Buy GLP-1 Weight Loss Peptides
Buy research-grade tirzepatide, semaglutide, retatrutide, cagrilintide and the latest GLP-1 / GIP / glucagon agonists in one place.
The Incretin Receptor Hierarchy
Each generation adds a receptor target — and a meaningful jump in trial weight loss. This is the conceptual map of the GLP shelf, not a product list.
Semaglutide
GLP-1 only
Tirzepatide
GLP-1 + GIP
Retatrutide
GLP-1 + GIP + Glucagon
Cagri-Sema
Amylin + GLP-1
All GLP / Weight Loss Products
20 compounds available · ≥98% HPLC verified · Ships from Phiogen
Retatrutide 15mg
Buy Retatrutide 15mg online — research-grade lyophilized peptide for laboratory use. Triple GLP-1/GIP/Glucagon receptor agonist. ≥98% HPLC purity verified.
CAS: 2381089-83-2
Tirzepatide 15mg
Buy Tirzepatide 15mg online — research-grade lyophilized peptide for laboratory use. 39-amino-acid synthetic peptide with C20 fatty diacid modification. ≥98% HPLC purity verified.
CAS: 2023788-19-2
Semaglutide 12mg
Buy Semaglutide 12mg online — research-grade lyophilized peptide for laboratory use. GLP-1 receptor agonist (31-amino acid lipidated peptide). ≥98% HPLC purity verified.
CAS: 910463-68-2
Cagrilintide 10mg
Buy Cagrilintide 10mg online — research-grade lyophilized peptide for laboratory use. Long-acting amylin analog. ≥98% HPLC purity verified.
CAS: 1415456-99-3
Cagri-Reta 10mg
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Cagri-Reta 5mg
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Cagri-Sema Blend 10mg
Buy Cagri-Sema Blend 10mg online — research-grade lyophilized peptide for laboratory use. Long-acting amylin analog. ≥98% HPLC purity verified.
CAS: 1415456-99-3
Cagrilintide 5mg
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CAS: 1415456-99-3
Mazdutide 6mg
Buy Mazdutide 6mg online — research-grade lyophilized peptide for laboratory use. GLP-1/Glucagon dual receptor agonist. ≥98% HPLC purity verified.
CAS: 2259320-21-7
Reta-Cagri 5mg/5mg
Buy Reta-Cagri 5mg/5mg online — research-grade lyophilized peptide for laboratory use. ≥98% HPLC purity verified.
Retatrutide 10mg
Buy Retatrutide 10mg online — research-grade lyophilized peptide for laboratory use. Triple GLP-1/GIP/Glucagon receptor agonist. ≥98% HPLC purity verified.
CAS: 2381089-83-2
Retatrutide 20mg
Buy Retatrutide 20mg online — research-grade lyophilized peptide for laboratory use. Triple GLP-1/GIP/Glucagon receptor agonist. ≥98% HPLC purity verified.
CAS: 2381089-83-2
Retatrutide 30mg
Buy Retatrutide 30mg online — research-grade lyophilized peptide for laboratory use. Triple GLP-1/GIP/Glucagon receptor agonist. ≥98% HPLC purity verified.
CAS: 2381089-83-2
Semaglutide 20mg
Buy Semaglutide 20mg online — research-grade lyophilized peptide for laboratory use. GLP-1 receptor agonist (31-amino acid lipidated peptide). ≥98% HPLC purity verified.
CAS: 910463-68-2
Semaglutide 30mg
Buy Semaglutide 30mg online — research-grade lyophilized peptide for laboratory use. GLP-1 receptor agonist (31-amino acid lipidated peptide). ≥98% HPLC purity verified.
CAS: 910463-68-2
Semaglutide 3mg
Buy Semaglutide 3mg online — research-grade lyophilized peptide for laboratory use. GLP-1 receptor agonist (31-amino acid lipidated peptide). ≥98% HPLC purity verified.
CAS: 910463-68-2
Semaglutide 6mg
Buy Semaglutide 6mg online — research-grade lyophilized peptide for laboratory use. GLP-1 receptor agonist (31-amino acid lipidated peptide). ≥98% HPLC purity verified.
CAS: 910463-68-2
Survodutide 10mg
Buy Survodutide 10mg online — research-grade lyophilized peptide for laboratory use. GLP-1/Glucagon dual agonist (BI 456906). ≥98% HPLC purity verified.
CAS: 2230198-02-2
Buy GLP-1 Weight Loss Peptides Online
The GLP-1 family is the most-researched class of weight-loss compounds in the world. We carry the full lineup — single-target GLP-1 agonists, dual GIP/GLP-1 agonists, and the new triple-receptor and amylin-co-agonist blends — all sourced from a single Iceland-based vendor (Phiogen) at ≥98% HPLC purity.
If you're shopping the GLP class for the first time, here's how the products compare:
Which GLP Peptide Should You Buy?
| Peptide | Receptors | Reported Weight Loss (Trial) | Best For |
| Semaglutide | GLP-1 | -14.9% (STEP-1) | First-time GLP-1 buyers, lower budget |
| Tirzepatide | GLP-1 + GIP | -22.5% (SURMOUNT-1) | Proven dual-agonist, the safe pick |
| Retatrutide | GLP-1 + GIP + Glucagon | -24.2% (TRIUMPH-4) | Most aggressive single peptide available |
| Cagrilintide | Amylin | -10.8% (mono) | Stack partner, hunger reduction |
| Cagri-Sema | Amylin + GLP-1 | -15.6% (REDEFINE-1) | Pre-mixed dual-action blend |
| Mazdutide | GLP-1 + Glucagon | -15.4% (DREAMS-1) | Liver-fat focused alternative |
| Survodutide | GLP-1 + Glucagon | -19.0% (Phase 2) | Newer dual-agonist option |
Pricing Snapshot
All prices are direct from Phiogen with the PEPS partner code applied:
- Semaglutide 3mg — $44.99 (cheapest GLP-1 entry point)
- Tirzepatide 15mg — $134.99 ($9.00/mg)
- Retatrutide 15mg — $179.99 ($12.00/mg, the newest molecule)
- Tirzepatide 60mg — $359.99 ($6.00/mg, best dual-agonist value)
- Retatrutide 30mg — $296.99 ($9.90/mg, best triple-agonist value)
What Comes In The Box
Every GLP-class order ships with the lyophilized vial sealed under nitrogen, the original certificate-of-analysis (CoA) for that exact lot, and a tracked shipping label. Bacteriostatic water is sold separately under our Reconstitution Solutions category — most buyers add a 30 mL bottle to their first order.
Shipping, Storage & Stock
- US shipping: 3–5 business days from Reykjavík via tracked courier
- Free shipping: orders over $200 (a single 30 mg vial of any GLP peptide qualifies)
- Stock status: every product card shows live stock — items marked "In Stock" ship the next business day
- Storage: lyophilized vials are stable at room temperature in transit; refrigerate on arrival, freeze (− 20 °C) for long-term storage
Why Buy From Peptide Scientists
We are an independent affiliate of Phiogen — we don't manufacture or warehouse anything. Every order ships direct from the vendor, every CoA is the lab's original document, and our PEPS partner code is built into every product link. That means: no markup, no middle-leg shipping, and the same return policy you would get ordering from Phiogen directly.
Buying Questions
Everything you need to know before placing your GLP / Weight Loss order.
What's the cheapest way to start with GLP-1 peptides?
Semaglutide 3mg at $44.99 is the lowest-priced entry into the class. It is enough for a 5-week 600 mcg/week research protocol. If you want the dual-agonist data, the cheapest tirzepatide vial is the 15 mg at $134.99.
Do I need to add bacteriostatic water to my order?
Yes if this is your first order. Lyophilized peptides ship as dry powder and need to be reconstituted. We sell 30 mL bottles of bacteriostatic water under the Reconstitution Solutions category for $9.99. One bottle covers most multi-week protocols.
How fast is shipping in the US?
Phiogen ships from Reykjavík with tracked international courier. Most US addresses receive orders in 3–5 business days. Free shipping kicks in at $200, and every GLP-1 vial above 12 mg qualifies on its own.
Are these the same compounds as the prescription versions?
The molecules are chemically identical (tirzepatide is tirzepatide, semaglutide is semaglutide). The difference is purpose: research-grade lyophilized peptides are sold for in-vitro and laboratory use only — they are not FDA-approved drug products and are not for human consumption.
What's the largest GLP-1 vial I can buy?
Retatrutide 30 mg ($296.99) and Tirzepatide 60 mg ($359.99) are the biggest single-vial options. Both ship free and offer the lowest per-milligram price in the catalog.
Buy GLP-1 Weight Loss Peptides — Shipped From Phiogen
20 GLP / Weight Loss products in stock. ≥98% HPLC purity, original lot CoA, free US shipping over $200.