Key facts at a glance
| Retatrutide sizes | 10 mg |
|---|---|
| Price | $49 (10 mg, $4.90/mg) · 10–15% off 5–10 vials |
| Third-party testing | ILS Laboratories, 99.68% (Jul 2026) |
| Ships from | Not stated (business address Glastonbury, CT) |
| Shipping | Free ground · free 2-day over $125 · same day by 3 pm ET |
| Payment methods | Visa, Mastercard, Amex; Zelle, Cash App, Venmo; crypto |
| Guarantee / refunds | Damaged/wrong items replaced; no returns |
| Best for | Cost-conscious buyers ordering 10 mg vials who are comfortable with email-only support |
Pros and cons
- Compound identified by CAS number and as a GLP-1/GIP/glucagon triple agonist
- Low 10 mg price ($49), with free shipping on every order
- Lot-numbered COAs from two labs (ILS and BTLabs) published online
- Named LLC with a street address
- Only a 10 mg vial; COA has no endotoxin test and identity is by HPLC retention time
- Email is the only support channel; no phone number
- No returns; packages marked delivered are not covered
- Domain registered April 2026
Bottom line
RNX Research is one of the cheapest sources for a 10 mg vial we found, and it labels the compound clearly and publishes lot-matched certificates. It is a small, owner-run operation with no phone line and a strict no-returns policy.
Products and pricing
“RNX-RT 10mg” is described as a 39-residue GLP-1/GIP/glucagon triple-receptor peptide, CAS 2381089-83-2. One vial costs $49 ($4.90/mg). Buying 5 vials takes 10% off, and buying 10 takes 15% off and adds a free 30 mL reconstitution solution. A promotion running until November 1, 2026, takes the cheapest vial off for every $100 spent. The catalog has 20 products.
Testing
ILS Laboratories issued COA-2026-GBOVH4 for lot RT99003-X on July 15, 2026: 99.68% HPLC purity, 10.62 mg net peptide content, identity confirmed by HPLC retention time and a negative fentanyl screen. An earlier lot (RT99001-X) was tested by BTLabs on May 13, 2026, at 99.6% with FTIR identity. Neither report includes endotoxin.
Shipping and payment
Ground shipping is free on every order, and 2-day shipping is free over $125. Orders placed by 3 pm ET on weekdays, or by 10 am ET on Saturdays, ship the same day by USPS or UPS in plain packaging with tracking. Our test checkout also offered USPS Priority ($11), UPS 2nd Day Air ($12) and UPS Next Day Air ($40). Shipping is US only. The footer shows Visa, Mastercard and American Express. The contact form mentions Zelle, Cash App and Venmo, and a crypto option appeared at checkout.
Policies and support
No returns or exchanges. Damaged or wrong items reported within 72 hours with photos are replaced free, and nothing needs to be sent back. Packages marked delivered are not covered. Support is by email (support@rnxresearch.com) and a contact form, which the site says the owner answers personally, usually the same day.
Reputation
RNXRESEARCH LLC lists 2389 Main St, Glastonbury, CT 06033. The domain was registered on April 2, 2026. Trustpilot shows a 4.7 TrustScore from 37 reviews, all five-star, and the company invites customers to review. We found no FDA warning letter or Eli Lilly lawsuit naming RNX Research.
Alternatives to RNX Research
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.