Improved Peptides Discount Code: PROFPEPTIDE — Save 15%
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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.
Improved Peptides is a research peptide supplier run by Improved Company LLC of Oklahoma City, Oklahoma; Prof. Peptide randomly selected three of its Freedom Diagnostics certificates and matched each one against the laboratory's own records.
Key facts
- Price comparison
- 0 of 19 comparable products cost less than the median for the same product and size across every vendor Prof. Peptide 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
- Prof. Peptide’s discount
- 15% off with code PROFPEPTIDE
- Code checked
- Prof. Peptide confirmed this rate on October 13, 2026.
Compare Improved Peptides’ prices: 5-Amino-1MQ, Selank, Melanotan II, PT-141, TB-500, GHK-Cu, Semaglutide, Tesamorelin
Overview
Improved Peptides sells lyophilized research peptides and blends as single vials, with certificates from Freedom Diagnostics and Krause Analytical. Orders placed before 4 PM Central, Monday to Friday, ship the same business day.
Improved Peptides states that every product carries a batch certificate and is HPLC-tested by a third party.
Improved Peptides catalog & prices
The compounds are grouped below by Prof. Peptide's research-library categories.
- 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, a blend of BPC-157 and TB-500
- Growth Hormone
- a blend of CJC-1295 and Ipamorelin, Tesamorelin
- Sleep & Recovery
- DSIP
- Skin Health & Anti-Aging
- GHK-Cu, Melanotan I, Melanotan II, GLOW, KLOW
- Sexual Health
- PT-141
Improved lists semaglutide, tirzepatide and retatrutide as GLP-1S, GLP-2T and GLP-3R. Its Krause Analytical certificate for GLP-1S lists Semaglutide (CAS 910463-68-2); its Freedom Diagnostics certificates name the other two only as “GLP TZ” and “GLP RT”, and its own product descriptions settle them, describing GLP-2T as a dual GIP and GLP-1 receptor agonist (tirzepatide) and GLP-3R as a triple GLP-1, GIP and glucagon receptor agonist (retatrutide).
Struck-through prices are Improved Peptides’ list price; the bold figure is the price once code PROFPEPTIDE is applied at checkout. Prices current as of October 16, 2026.
Testing: Labs & Certificates of Analysis
Improved's certificates come from Freedom Diagnostics and Krause Analytical. The Freedom Diagnostics reports give identity by LC-MS, purity by HPLC, net content and appearance for a named lot, with a search code for the laboratory's own document store. Improved Peptides states that every product carries a batch certificate and is HPLC-tested by a third party.
Prof. Peptide read three of its certificates at Freedom Diagnostics' own document store on October 11, 2026: GLOW 70mg (99.50%), GLP3R 10mg (99.96%) and GLP2T 10mg (99.73%), each naming Improved Peptides as the client. The panel below lists every certificate's own results.
Prof. Peptide Verification
Verified · 11 October 2026
Prof. Peptide identified the lab, matched the certificates on its own website, and read every test result.
Lab identified
PassedCertificates verified
Passed3 of 3 matched on Freedom Diagnostics’ own website.
The three certificates were tested on 29 April and 3 September 2026.
GLOW 70mg · lot IP-GLOW-2026-102
PassedFreedom Diagnostics · tested 3 September 2026 · certificate Impr2608311389
- Passed: Identity (LC-MS) — GHK-Cu/Thymosin Beta-4/BPC-157 (names the labeled compound)
- Passed: Purity (HPLC-UV) — 99.50% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Not graded, the line does not quantify every component of the blend: Net Content — GHK-Cu – 60.34 mg
- Passed: Appearance — Blue Lyophilized Powder (the expected blue lyophilized form)
- Passed: Identity — Confirmed
GLP2T 10mg · lot IP-TIRZ-2026-001
PassedFreedom Diagnostics · tested 29 April 2026 · certificate Impr2604280040
- Not graded, the laboratory prints “GLP TZ”, not a compound name: Identity (LC-MS) — GLP TZ
- Passed: Purity (HPLC-UV) — 99.73% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Passed: Net Content — 11.58 mg (at least 90% of the labeled 10 mg)
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
GLP3R 10mg · lot IP-RETA-2026-001
PassedFreedom Diagnostics · tested 29 April 2026 · certificate Impr2604280038
- Not graded, the laboratory prints “GLP RT”, not a compound name: Identity (LC-MS) — GLP RT
- Passed: Purity (HPLC-UV) — 99.96% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Passed: Net Content — 10.67 mg (at least 90% of the labeled 10 mg)
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
All products are sold for laboratory and research use only.
Payment and shipping
Orders placed before 4 PM Central Time, Monday to Friday, ship the same business day; later and weekend orders ship the next business day. Standard shipping is free, by tracked USPS Priority Mail, arriving in 2–4 business days, to all 50 states, P.O. boxes and APO/FPO addresses. International orders to the countries offered at checkout ship by USPS Priority Mail International for a flat $39, free over $499, with a $150 minimum and 7–21 business days in transit.
All sales are final. Claims for shipping damage, a wrong item or a manufacturer defect go to support within 14 days of delivery with photos and are reviewed within 2 business days; approved claims receive a replacement or store credit.
Customer service
Support runs by email at support@improvedpeptides.com and through the contact form on its site, Monday to Friday, 9 AM to 5 PM Central; its contact page gives one business day for a reply. Improved Peptides is Improved Company LLC, at 9905 S Pennsylvania Ave, Oklahoma City, Oklahoma.
Ratings & reviews
Prof. Peptide checked Trustpilot on 20 October 2026: 3.8 TrustScore from 2 reviews. Prof. Peptide checked Finnrick on 20 October 2026: Improved Peptides has no Finnrick listing.
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Frequently Asked Questions
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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.