Key facts at a glance
| Retatrutide sizes | 5, 10, 15, 20 mg |
|---|---|
| Price | $52 (5 mg) · $99 (10 mg) · $123 (20 mg) |
| Third-party testing | Janoshik COA link, 99.862% |
| Ships from | Austin, TX |
| Shipping | $12 · free over $150 · 2–5 days |
| Payment methods | Visa, Mastercard, Bitcoin, Zelle, Cash App, Venmo |
| Guarantee / refunds | 14-day returns; reship or refund for lost packages |
| Best for | Buyers who want responsive support and clear lost-package protection |
Pros and cons
- Compound clearly identified with LY3437943 and CAS number
- Phone, toll-free and email support with 24h reply promise
- Reship or full refund for lost packages
- Same-day dispatch 7 days a week before 3 pm CT
- Domain only registered in May 2026; no reviews yet
- Batch number and test date not visible on the COA link text
Bottom line
Core Research Peptides (not to be confused with Core Peptides) has buyer-friendly policies and clear product labeling (it names LY3437943 and the CAS number). It is also one of the newest stores, so there is little track record to judge.
Products and pricing
“RETA (LY3437943) – Triple GLP-1/GIP/Glucagon Receptor Agonist”, CAS 2381089-83-2: 5 mg $52, 10 mg $99 (multi-packs down to $92.99/vial), 15 mg $111, 20 mg $123.
Testing
Standard purity of 99%; the COA link credits Janoshik with a result of 99.862%. The COA library points to janoshik.com/verify. Batch and date were not visible in the page text.
Shipping and payment
Ships from Austin, TX, same day 7 days a week for orders by 3 pm CT. $12 standard, free over $150, expedited and overnight available, 2–5 business days. Visa and Mastercard; Bitcoin, Zelle, Cash App and Venmo are also listed.
Policies and support
14-day returns on unopened products; refund or replacement for damaged or wrong items (report within 48 hours); reship or full refund for packages with no movement for 10+ business days. Phone (512) 643-4570, toll-free (844) 393-9441 and email.
Reputation
Domain registered May 4, 2026. Trustpilot profile claimed with zero reviews as of October 2026.
Alternatives to Core Research Peptides
Every vendor is assessed against the same 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.