Improved Peptides Discount Code: PROFPEPTIDE — Save 15%
Use coupon code PROFPEPTIDE at Improved Peptides to save 15% on your order. Prof. Peptide confirmed this rate on October 13, 2026.
Key facts
- Price comparison
- 0 of 19 comparable products cost less than the median for the same product and size across every vendor PP tracks — before the code
- Catalog
- 27 products at the 2026-10-16 pull · 19 in Prof. Peptide’s price comparison, 19 of those 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’ prices: 5-Amino-1MQ, Selank, PT-141, Melanotan II, GHK-Cu, TB-500, Semax, Tesamorelin
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-1
- Semaglutide (GLP-1S), Tirzepatide (GLP-2T), Retatrutide (GLP-3R), MOTS-C, 5-Amino-1MQ
- Recovery & Tissue Repair
- BPC-157, TB-500, KPV, and a Wolverine (Wolverine Stack) blend
- Growth Hormone
- GH Stack, 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.
Prof. Peptide Verification
Verified · 11 October 2026
We identified the lab, matched the certificates on its own website, and read every test result.
Lab identified
PassedFreedom Diagnostics
Certificates verified
Passed3 of 3 matched on Freedom Diagnostics’ own website, and the same lookup rejected a made-up code.
All three certificates were tested on 29 April and 3 September 2026.
Analytical Results
No specifications printedEvery component of the Analytical Results, as the certificates name it.
- No specification printed: Identity (LC-MS) — GLP2T 10mg: GLP TZ · GLP3R 10mg: GLP RT · GLOW 70mg: GHK-Cu/Thymosin Beta-4/BPC-157
- No specification printed: Purity (HPLC-UV) — GLP2T 10mg: 99.73% · GLP3R 10mg: 99.96% · GLOW 70mg: 99.50% — against 98%, Prof. Peptide’s default
- No specification printed: Net Content — GLP2T 10mg: 11.58 mg · GLP3R 10mg: 10.67 mg · GLOW 70mg: GHK-Cu – 60.34 mg
- No specification printed: Appearance — GLP2T 10mg: White Lyophilized Powder · GLP3R 10mg: White Lyophilized Powder · GLOW 70mg: Blue Lyophilized Powder
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 October 16, 2026.
Prof. Peptide checked Trustpilot and Finnrick on 30 September 2026. Trustpilot: 3.8 from 2 reviews (read 30 September 2026).
Frequently Asked Questions
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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.