Improved Peptides Discount Code: PROFPEPTIDE — Save 15%
Use coupon code PROFPEPTIDE at Improved Peptides to save 15% on your order. Prof. Peptide verifies this code directly with the vendor and updates it when it changes.
Key facts
- Price comparison
- 2 of 19 comparable products cost less than the median for the same product and size across every vendor PP tracks — before the code
- Catalog
- 19 priced products, 19 in stock · Lyophilized powder in vials
- Third-party testing
- Freedom Diagnostics & Krause Analytical
- Certificates of analysis
- Public COA library on the vendor’s own domain, one downloadable certificate per verified compound, with a further set of compounds shown as still in verification; the vendor states no count
- Prof. Peptide’s discount
- 15% off with code PROFPEPTIDE
Compare Improved Peptides’s prices: 5-Amino-1MQ, GHK-Cu, TB-500, PT-141, Semaglutide, Selank, Semax, NAD+
Improved Peptides (improvedpeptides.com, operated by The Improved Company LLC) is a US-based research-peptide supplier that states it launched in 2026 and has shipped 1,300+ orders. Its catalog is single-vial lyophilized peptides, with a standing “buy two, get one free” promotion (which does not combine with a discount code). Payment is by Visa, Mastercard, PayPal, Venmo, and Zelle. Popular compounds by research area:
- Metabolic & GLP
- Semaglutide (GLP-1S), Tirzepatide (GLP-2T), Retatrutide (GLP-3R), MOTS-C, 5-Amino-1MQ
- Growth Hormone
- CJC-1295/Ipamorelin, Tesamorelin
- Sleep & Recovery
- DSIP
Improved Peptides publishes a public COA Library, and each product page links its own Certificate of Analysis — a genuinely public, per-product library that most vendors don’t offer. Of its 24 catalog items, 10 currently have a published COA; the rest are marked “in verification,” available on request. The certificates we reviewed were split across two independent US labs: Freedom Diagnostics (signed by principal chemist Alex Johnson, each report carrying a search code verifiable at FreedomDiagnosticsTesting.com) and Krause Analytical of Austin, TX (signed by laboratory director Mark C. Krause). Each report confirms identity by LC-MS and purity by RP-HPLC-UV — 99.02–99.9% across the certificates reviewed — plus net peptide content, and each carries a product-specific lot (e.g. IP-BPC-2026-001, an April 2026 batch). Improved’s coded GLP names map to known compounds — its “GLP-1S” certificate is issued for Semaglutide, and its own product descriptions identify GLP-2T and GLP-3R by receptor mechanism (a dual GIP/GLP-1 agonist and a triple GLP-1/GIP/glucagon agonist respectively), each of which fits exactly one compound. Improved additionally states that it runs endotoxin (under 0.25 EU/mg), microbial and sterility testing to USP standards, and fills in an ISO 7 cleanroom; those panels are not printed on the certificates we reviewed, so they are reported here as the vendor states them, not as independently verified. No lab accreditation is printed on the certificates.
Improved Peptides catalog & prices
Struck-through prices are Improved Peptides’ list price; the bold figure is your price once you apply code PROFPEPTIDE at checkout. Prices current as of August 16, 2026.
Frequently Asked Questions
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What are GLP-1S, GLP-2T and GLP-3R?
Affiliate disclosure: Prof. Peptide is independently operated and may earn affiliate commissions when you use our discount codes or buy through our links, at no additional cost to you. Affiliate relationships never determine vendor inclusion, ranking, verification, or our editorial conclusions.