Midwest Peptide Coupon Code — 40% Off
midwestpeptide.com
Updated
Reveal the discount code below to save 40% at Midwest Peptide. Prof. Peptide verifies this code directly with the vendor and updates it when it changes.
Midwest Peptide is a research peptide supplier run by Midwest BioResearch LLC of Mission, Kansas; Prof. Peptide matched three of its certificates at Precision Mass Spec and Freedom Diagnostics.
Discount Code
See offer (opens Midwest Peptide in a new tab)Key facts
- Price comparison
- 13 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
- 36 products at the 2026-10-24 pull · 19 in Prof. Peptide’s price comparison, 18 of those in stock · Vials of lyophilized powder, plus an Adamax spray
- Third-party testing
- Precision Mass Spec, ILS Laboratories & Freedom Diagnostics
- Certificates of analysis
- Certificate published on each product’s own page, reachable from a public COA directory covering the catalog
- Prof. Peptide’s discount
- Press See offer above for the best current offer, including Prof. Peptide’s code
- Code checked
- Prof. Peptide confirmed this rate on October 13, 2026.
Compare Midwest Peptide’s prices: Selank, Tirzepatide, Semax, Melanotan II, GHK-Cu, Cagrilintide, BPC-157, MOTS-C
Overview
Midwest Peptide sells lyophilized research peptides and blends in vials, an Adamax spray, bacteriostatic water and a peptide case. Each product page shows the certificate for its current batch, from Precision Mass Spec or ILS Laboratories.
Midwest Peptide states that every batch is third-party tested. Orders of $75 or more ship free within the United States, and its Box Builder and bundle tiers discount larger orders.
Midwest Peptide catalog & prices
The compounds are grouped below by Prof. Peptide's research-library categories.
- Metabolic & GLP-1
- Retatrutide (GLP-3 RT), Tirzepatide (GLP-2 TZ), Semaglutide (GLP-1 SM), Cagrilintide, MOTS-c, AOD-9604, 5-Amino-1MQ
- Recovery & Tissue Repair
- BPC-157, TB-500, Wolverine (BPC-157 and TB-500), KPV
- Growth Hormone
- CJC-1295 (no DAC), Tesamorelin, Sermorelin, a blend of CJC-1295 and Ipamorelin, a blend of Tesamorelin and Ipamorelin
- Skin Health & Anti-Aging
- GHK-Cu, Melanotan I, Melanotan II, GLOW, KLOW
- Sleep & Recovery
- DSIP
- Longevity
- NAD+, Glutathione, SS-31
- Sexual Health
- PT-141, Kisspeptin
- Gut Health & Immunity
- VIP
- Also listed
- Bacteriostatic water, a peptide case
Midwest lists retatrutide as GLP-3 RT, tirzepatide as GLP-2 TZ and semaglutide as GLP-1 SM, and the certificates on its own product pages name each: Precision Mass Spec's report PMS-1210335881 for GLP-3 RT gives retatrutide's CAS number, 2381089-83-2; its report PMS-1209388602 for GLP-2 TZ gives tirzepatide's, 2023788-19-2, and labels the chromatogram peak Tirzepatide; and the ILS Laboratories report COA-2026-PZVW7A for GLP-1 SM confirms Semaglutide as the identity.
Struck-through prices are Midwest Peptide’s list price; the bold figure is the price once the discount code is applied at checkout. Prices current as of October 24, 2026.
Testing: Labs & Certificates of Analysis
Each Midwest product page shows the certificate for its current batch, and a certificate page on its site lists one for every product. The current certificates come from Precision Mass Spec and ILS Laboratories, and some earlier batches from Freedom Diagnostics. The Precision Mass Spec reports cover purity by HPLC, identity by LC-MS/MS, net content, water and acetate content, heavy metals by ICP-MS, bacterial endotoxins and sterility. Midwest Peptide states that every batch is third-party tested.
Prof. Peptide matched three of its certificates against the laboratories' own records on October 18, 2026: Tesamorelin 10mg (99.91%) and Glutathione 1500mg (99.74%) at Precision Mass Spec's own lookup, and DSIP 10mg (99.01%) at Freedom Diagnostics' document store, each naming Midwest Peptide as the client. The panel below lists every certificate's own results.
Prof. Peptide Verification
Verified · 18 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 each laboratory’s own website.
The three certificates were tested on 15 August, 14 September and 12 October 2026.
DSIP 10mg · lot MPDS002
PassedFreedom Diagnostics · tested 15 August 2026 · certificate Midw2608110259
- Passed: Identity (LC-MS) — DSIP (names the labeled compound)
- Passed: Purity (HPLC-UV) — 99.01% (against ≥98%, Prof. Peptide’s standard; the certificate prints no specification)
- Passed: Net Content — 12.30 mg (at least 90% of the labeled 10 mg)
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
- Passed: Identity — Confirmed
Glutathione 1500mg · lot MPGN003-MW-GLUW-0911
PassedPrecision Mass Spec · tested 14 September 2026 · certificate PMS-9403999864
- Passed: Purity (HPLC) — 99.74% (spec >= 90.0%) · PASS
- Passed: Mass Identification (LC-MS/MS) — Glutathione (spec Conforms to declared compound) · PASS
- Passed: Net Peptide Content — 1627.88 mg (spec >= 90% of 1500 mg) · PASS
- Passed: Water Content (Karl Fischer) — 4.82% (spec <= 10.0%) · PASS
- Passed: Acetate Content (HPLC) — 3.97% (spec < 12.0%) · PASS
- Passed: Heavy Metals (ICP-MS) — Not Detected (spec < 10 ppm) · PASS
- Passed: Bacterial Endotoxins (LAL) — Not Detected (spec < 5 EU/mg) · PASS
- Passed: Sterility (RMM) — Growth Not Detected (spec USP <71>) · PASS
- Passed: Mass Balance — Conforms (spec 95.0 – 105.0%) · PASS
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
Tesamorelin 10mg · lot MPTA008-MW-TESW-1008
PassedPrecision Mass Spec · tested 12 October 2026 · certificate PMS-1557039604
- Passed: Purity (HPLC) — 99.91% (spec >= 90.0%) · PASS
- Passed: Mass Identification (LC-MS/MS) — Tesamorelin (spec Conforms to declared compound) · PASS
- Passed: Net Compound Content — 10.47 mg (spec >= 90% of 10 mg) · PASS
- Passed: Water Content (Karl Fischer) — 4.68% (spec <= 10.0%) · PASS
- Passed: Acetate Content (HPLC) — 4.01% (spec < 12.0%) · PASS
- Passed: Heavy Metals (ICP-MS) — Not Detected (spec < 10 ppm) · PASS
- Passed: Bacterial Endotoxins (LAL) — Not Detected (spec < 5 EU/mg) · PASS
- Passed: Sterility (RMM) — Growth Not Detected (spec USP <71>) · PASS
- Passed: Mass Balance — Conforms (spec 95.0 – 105.0%) · PASS
- Passed: Appearance — White Lyophilized Powder (the expected white lyophilized form)
All products are sold for laboratory research use only, to buyers aged 21 or older.
Payment and shipping
Orders placed before 2:00 PM Central, Monday to Friday, ship the same business day by UPS or USPS and typically arrive in 3–5 business days. Shipping is free on orders of $75 or more and a flat $6.99 below that, within the United States only and not to PO boxes. Midwest accepts Visa, Mastercard, American Express and Discover cards, Apple Pay and Zelle; credit cards carry a 3% processing fee, and debit cards and Zelle carry none.
Its bundle tiers take 8% off at $150, 12% at $225, 15% at $325 and 20% at $450, applied automatically at checkout. Unopened products can be returned within 30 days of delivery, with return shipping on the buyer unless an item arrived damaged or defective; damage reported within 48 hours, with photos, is replaced. Refunds are processed within 5–7 business days of the return arriving.
Customer service
Support runs by email at info@midwestpeptide.com, by phone at (636) 734-2390 and through the contact form on its site, Monday to Friday from 9 AM to 5 PM Central, with a reply within one business day. Midwest Peptide is Midwest BioResearch LLC, based in Mission, Kansas.
Ratings & reviews
Prof. Peptide checked Trustpilot on 20 October 2026: 4.9 TrustScore from 347 reviews. Prof. Peptide checked Finnrick on 20 October 2026. Finnrick’s page for Midwest Peptide reads: “Not enough classifiable tests to rate this vendor yet.”
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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.