Key facts at a glance
| Retatrutide sizes | 10 mg |
|---|---|
| Price | $99 (10 mg) · 3 for $198 ($6.60/mg) |
| Third-party testing | Freedom Diagnostics, 99.96% (Apr 2026) |
| Ships from | USA (state not stated) |
| Shipping | Free USPS Priority · free 2-day over $200 · 2–4 days |
| Payment methods | Visa, Mastercard, Amex, Zelle (5% off) |
| Guarantee / refunds | All sales final; replacement or store credit for damage/wrong item |
| Best for | Buyers ordering small quantities who value free, fast domestic shipping |
Pros and cons
- Free standard shipping on every US order, with same-day dispatch for orders by 4 pm CT
- Freedom Diagnostics COA with LC-MS identity and net content
- Buy-2-get-1 pricing brings the 10 mg vial to $66
- Mainstream card payments accepted
- Sold as "GLP-3R"; the name retatrutide is not used
- Only a 10 mg vial is offered
- COA is from April 2026 and has no endotoxin test; the lot code on the PDF differs from the one on the product page
- No street address or phone number; only two Trustpilot reviews
Bottom line
Improved Peptides (formerly improvedpeptides.com, which now redirects to improvedusa.com) offers free USPS Priority shipping on every order. Its testing is adequate but not recent, and the business is young and thinly reviewed.
Products and pricing
“GLP-3R” is described as a triple-receptor agonist targeting the GLP-1, GIP and glucagon receptors. The product page does not use the name retatrutide. There is a single 10 mg vial at $99 ($9.90/mg). Under the current buy-2-get-1 offer, three vials cost $198 ($6.60/mg). Paying with Zelle takes 5% off.
Testing
Freedom Diagnostics reported the GLP3R 10 mg sample on April 29, 2026: purity 99.96% by HPLC-UV, identity confirmed by LC-MS, and 10.67 mg net content. The PDF lists lot IP-RETA-2026-001, while the product page names lot IP-GLP3R-2026-001. The certificate has no endotoxin or microbial results.
Shipping and payment
Orders placed before 4 pm CT on weekdays ship the same day by USPS Priority Mail, with tracking, in 2–4 business days. Standard shipping is free on every US order, and 2-day shipping is free over $200. There is no minimum order for US delivery. An insulated cooler is sold separately for $24.99. Accepted payments are Visa, Mastercard, American Express and Zelle.
Policies and support
All sales are final. Claims for damage, wrong items or a confirmed defect must be filed within 14 days with photos. Approved claims get a replacement or store credit, and refunds to the original payment method are “rare” and at the company’s discretion. Lost packages are investigated on request. Support is by email (support@improvedpeptides.com) and a contact form, Monday–Friday 9 am–5 pm CT.
Reputation
The site names Improved Company LLC, founded in Oklahoma in 2026, but lists no street address or phone number. Both domains were registered on March 4, 2026. Trustpilot (improvedpeptides.com) shows a 3.8 TrustScore from only 2 reviews, and Trustpilot notes the company has not recently invited reviews. We found no FDA warning letter or Eli Lilly lawsuit naming the company.
Alternatives to Improved Peptides
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.