Improved Peptides Discount Code: PROFPEPTIDE — Save 15%
Use 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.
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
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:
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. 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.
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
What compounds does Improved Peptides carry?+−
Improved Peptides carries about 24 single-vial lyophilized research compounds spanning recovery (BPC-157, TB-500, KPV, a Wolverine blend), metabolic/GLP (GLP-1S which its COA identifies as Semaglutide, plus coded GLP-2T and GLP-3R, MOTS-C, 5-Amino-1MQ), growth-hormone secretagogues (CJC-1295/Ipamorelin, Tesamorelin), skin and pigmentation (GHK-Cu, MT-1, MT-2, PT-141, GLOW and KLOW blends), cognitive and sleep (Selank, Semax, DSIP), and longevity (Epithalon, NAD+).
Does Improved Peptides have a coupon code?+−
Yes. Use code PROFPEPTIDE at checkout to save 15% on your Improved Peptides order. This code is verified and maintained by Prof. Peptide. Improved also runs an automatic 'buy two, get one free' bundle, but bundle pricing does not combine with a discount code — the 15% code applies to standard (non-bundle) pricing.
How do I use the Improved Peptides discount code?+−
Add your items to cart at improvedpeptides.com, go to checkout, and enter PROFPEPTIDE in the code field. A 15% discount applies to your order total (the code is accepted in uppercase). It applies to standard pricing rather than the buy-two-get-one-free bundle.
How does Improved Peptides test its peptides?+−
It publishes a public COA Library and links a Certificate of Analysis on each product page (10 of 24 items currently have one; the rest are 'in verification,' by request). The certificates come from two independent US labs — Freedom Diagnostics (signed by chemist Alex Johnson, with a search code verifiable at FreedomDiagnosticsTesting.com) and Krause Analytical in Austin, TX (signed by director Mark C. Krause). Each confirms identity by LC-MS and purity by RP-HPLC-UV (99.02–99.9% across the certificates reviewed) plus net content, with a product-specific lot. Improved additionally states it runs endotoxin, microbial/sterility, and ISO 7 cleanroom controls; those are not printed on the certificates we reviewed, so they reflect the vendor's stated process, not independently verified testing.
What is GLP-1S?+−
GLP-1S is Improved Peptides' coded name for Semaglutide — confirmed on its Krause Analytical certificate, which lists the compound as Semaglutide (CAS 910463-68-2). GLP-2T and GLP-3R are additional coded GLP-class compounds; their specific identities are not established here.
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.
