Peptide Express Coupon Code: PROFPEPTIDE — Save 15%
peptide.express
Updated
Use discount code PROFPEPTIDE at Peptide Express to save 15% on your order. Prof. Peptide confirms this code with the vendor, tests it at checkout, and updates it when it changes.
Peptide Express is a research peptide supplier that publishes its catalog and every certificate as open data feeds; Prof. Peptide matched all four of its Freedom Diagnostics certificates against the laboratory's own files.
Key facts
- Price comparison
- 16 of 32 comparable products cost less than the median for the same product and size across every vendor Prof. Peptide tracks — before the code
- Catalog
- 38 products at the 2026-10-23 pull · 32 in Prof. Peptide’s price comparison, 18 of those in stock · Lyophilized peptide vials and named blends, kits, a nasal spray and bacteriostatic water
- Third-party testing
- Freedom Diagnostics & Mistral Diagnostics
- Certificates of analysis
- Lab-results pages on the vendor’s own site and an open COA feed, each certificate with its laboratory and lot, issued by Freedom Diagnostics and Mistral Diagnostics to Peptide.Express
- Prof. Peptide’s discount
- 15% off with code PROFPEPTIDE
- Code checked
- Prof. Peptide confirmed this rate in a cart test on October 18, 2026.
Compare Peptide Express’ prices: Tirzepatide, TB-500, BPC-157, NAD+, SS-31, MOTS-C, GHK-Cu, DSIP
Overview
Peptide Express sells research peptides in lyophilized vials, alongside named blends, kits, a Semax nasal spray and bacteriostatic water. It publishes its whole catalogue and every certificate as open data feeds, each certificate with its laboratory and lot.
Peptide Express catalog & prices
The compounds are grouped below by Prof. Peptide's research-library categories, each linked to Prof. Peptide's research profile.
- Metabolic & GLP-1
- Retatrutide (GLP3-RETA), Tirzepatide (GLP2-TIRZ), MOTS-c (alone and in a kit)
- Recovery & Tissue Repair
- BPC-157, TB-500, a blend of BPC-157 and TB-500, and a kit of both
- Growth Hormone
- Ipamorelin, a blend of CJC-1295 (no DAC) and Ipamorelin, Sermorelin, Tesamorelin
- Skin Health & Anti-Aging
- GHK-Cu, KLOW, Melanotan II
- Sexual Health
- PT-141, Kisspeptin
- Also listed
- HCG, HGH
- Supplies
- Bacteriostatic water (3 mL and 10 mL)
Code PROFPEPTIDE takes 15% off, including on the many items Peptide Express has marked down.
Struck-through prices are Peptide Express’ list price; the bold figure is the price once code PROFPEPTIDE is applied at checkout. Prices current as of October 23, 2026.
Testing: Labs & Certificates of Analysis
Peptide Express publishes its certificates from two laboratories, Freedom Diagnostics and Mistral Diagnostics, each addressed to Peptide.Express. Prof. Peptide matched all four of its Freedom Diagnostics certificates (Retatrutide in three strengths and MOTS-c) against the laboratory's own files; the panel below shows each one.
Prof. Peptide Verification
Verified · 20 October 2026
Prof. Peptide identified the lab, matched the certificates on its own website, and read every test result.
Lab identified
PassedCertificates verified
Passed4 of 4 matched on Freedom Diagnostics’ own website.
The four certificates were tested on 24 September 2026.
MOTS-c 10mg · lot PX-L916
PassedFreedom Diagnostics · tested 24 September 2026 · certificate Pept2609220043
- Passed: Identity (LC-MS) — MOTS-C (names the labeled compound)
- Passed: Purity (HPLC-UV) — 99.19% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Passed: Net Content — 9.16 mg (at least 90% of the labeled 10 mg)
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
- Passed: Identity — Confirmed
Retatrutide 10mg · lot PX-L916
PassedFreedom Diagnostics · tested 24 September 2026 · certificate Pept2609220039
- Not graded, the laboratory prints “GLP RT”, not a compound name: Identity (LC-MS) — GLP RT
- Passed: Purity (HPLC-UV) — 99.94% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Passed: Net Content — 11.36 mg (at least 90% of the labeled 10 mg)
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
- Passed: Identity — Confirmed
Retatrutide 20mg · lot PX-L916
PassedFreedom Diagnostics · tested 24 September 2026 · certificate Pept2609220035
- Not graded, the laboratory prints “GLP RT”, not a compound name: Identity (LC-MS) — GLP RT
- Passed: Purity (HPLC-UV) — 99.97% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Passed: Net Content — 22.28 mg (at least 90% of the labeled 20 mg)
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
- Passed: Identity — Confirmed
Retatrutide 30mg · lot PX-L916
PassedFreedom Diagnostics · tested 24 September 2026 · certificate Pept2609220031
- Not graded, the laboratory prints “GLP RT”, not a compound name: Identity (LC-MS) — GLP RT
- Passed: Purity (HPLC-UV) — 99.98% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Passed: Net Content — 31.62 mg (at least 90% of the labeled 30 mg)
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
- Passed: Identity — Confirmed
Peptide Express is listed on Prof. Peptide's All Vendors page.
All products are sold for laboratory research use only.
Payment and shipping
Peptide Express states that US orders placed before 2 PM Eastern on a business day ship the same day. Shipping is free on orders over $150, measured on the total after discounts.
Customer service
Customer service is by email at support@peptide.express or through the contact page on its site.
Ratings & reviews
Bought from Peptide Express? Tell Prof. Peptide how it went.
Frequently Asked Questions
Is Peptide Express legit?
Is the Peptide Express code still working?
Does Prof. Peptide earn a commission on this code?
Does Peptide Express have an affiliate program?
Which laboratories test Peptide Express products?
What do the Freedom Diagnostics certificates test?
How does Peptide Express ship?
Affiliate disclosure: Prof. Peptide is independently operated and may earn affiliate commissions on purchases made with its codes or through its links, at no additional cost to the buyer. Affiliate relationships never determine vendor inclusion, ranking, verification, or Prof. Peptide's editorial conclusions.