Key facts at a glance
| Retatrutide sizes | 10, 20, 30 mg |
|---|---|
| Price | $69.99 (10 mg) · $134.99 (20 mg) · $199.99 (30 mg) |
| Third-party testing | Precision Mass Spec, per size, 99.71–99.86% |
| Ships from | Not stated (Mission, KS) |
| Shipping | $6.99 · free over $75 · 3–5 days |
| Payment methods | Visa, Mastercard, Amex, Discover (3% fee), Apple Pay, Zelle |
| Guarantee / refunds | 30-day returns on unopened items; replacement for damaged items |
| Best for | Buyers who want thorough, current lot testing |
Pros and cons
- Separate COA for each vial size, tested September–October 2026
- COAs cover endotoxin, sterility, heavy metals, water and acetate content
- Phone and email support with a written 30-day return policy
- Trustpilot 4.9 from 347 reviews
- Sold as 'GLP-3 RT'; the product page does not name retatrutide (the COAs give the CAS number)
- City only (Mission, KS); no street address
- 3% fee on credit cards; no written policy for lost packages
Bottom line
Midwest Peptide has some of the most complete retatrutide testing we found, along with mid-range prices and responsive support. The compound is listed as “GLP-3 RT”, a “39-amino acid triple agonist peptide targeting GIP, GLP-1, and glucagon receptors”. The product page does not use the word retatrutide, but the COAs list CAS 2381089-83-2.
Products and pricing
10 mg $69.99 ($7.00/mg), 20 mg $134.99 ($6.75/mg) and 30 mg $199.99 ($6.67/mg), all in stock. Cart-level discounts of 8–20% apply from $150. A sitewide 40% code was running when we checked.
Testing
Each size has its own Precision Mass Spec certificate, with a lot number, purity by HPLC and identity by LC-MS/MS:
- 10 mg, lot MPRT011-MW-RT3W-0930: 99.71%, 10.22 mg, reported October 5, 2026
- 20 mg, lot MPRT2009-MW-RT3W-0930: 99.86%, 20.49 mg, reported October 5, 2026
- 30 mg, lot MPRT3002-MW-RT3W-0911: 99.80%, 31.21 mg, reported September 22, 2026
All three reports show endotoxin and heavy metals not detected and no growth on sterility testing. Each report also covers water content, acetate content and mass balance.
Shipping and payment
US only, with no PO boxes. Orders before 2 pm CT on weekdays ship the same day by UPS or USPS, arriving in 3–5 business days. Shipping is $6.99, or free over $75. Payment is by card (3% fee on credit cards), Apple Pay or Zelle.
Policies and support
Unopened items can be returned within 30 days; the customer pays return shipping unless the item is damaged or defective. Damaged or defective items reported within 48 hours, with photos, are replaced. Replacements for reconstituted product require Hospira bacteriostatic water. The shipping policy does not cover lost packages. Support is by phone at (636) 734-2390 and by email, Monday–Friday 9 am–5 pm CT. The operator is Midwest BioResearch LLC.
Reputation
Trustpilot shows 4.9 from 347 reviews (97% five-star). The company invites reviews and has replied to all negative ones. The domain was registered in August 2025. We found no FDA warning letter or Eli Lilly lawsuit naming the company.
Alternatives to Midwest Peptide
Scores use the weighted criteria explained on How We Rate. Vendors change prices and policies often — confirm details on the vendor's site before ordering. Retatrutide is an investigational compound and is not FDA-approved; see our medical disclaimer.